Updated on 2025/04/05

Information

 

写真a

 
MUTA OSAMU
 
Organization
Faculty of Information Science and Electrical Engineering Department of Advanced Information Technology Professor
Center for Japan-Egypt Cooperation in Science and Technology(E-JUST Center) (Concurrent)
School of Engineering Department of Electrical Engineering and Computer Science(Concurrent)
Graduate School of Information Science and Electrical Engineering Department of Information Science and Technology(Concurrent)
Graduate School of Integrated Frontier Sciences Department of Automotive Science(Concurrent)
Title
Professor
Contact information
メールアドレス
Tel
0928026912
Profile
(1) Research Project 1. Multi-Input Multi-Output (MIMO) Transceiver designs and related signal processing techniques 2. Wireless sensing and applications of wireless communication techniques (2) Education Undergraduate Courses Lectures: - Digital Signal Processing - Communication Systems Graduate Courses Lectures: - Exercise in Advanced Digital Communications

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  • Informatics / Information network

Degree

  • Ph.D

Research History

  • Kyushu University Faculty of Information Science and Electrical Engineering Professor 

    2023.12 - Present

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    Country:Japan

  • Kyushu University Center for Japan-Egypt Cooperation in Science and Technology Associate Professor 

    2010.8 - 2023.11

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    Country:Japan

  • Kyushu University Faculty of Information Science and Electrical Engineering Specially Appointed Associate Professor 

    2009.4 - 2010.7

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    Country:Japan

  • Kyushu University Faculty of Information Science and Electrical Engineering Assistant Professor 

    2007.4 - 2009.3

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    Country:Japan

  • Kyushu University Faculty of Information Science and Electrical Engineering Research Assistant 

    2001.4 - 2007.3

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    Country:Japan

Education

  • Kyushu University   Graduate School of Information Science and Electrical Engineering  

    1998.4 - 2001.3

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    Country:Japan

  • Kyushu Institute of Technology   Graduate School of Computer Science and Systems Engineering  

    1996.4 - 1998.3

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    Country:Japan

  • Ehime University   School of Engineering   Department of Electrical and Electronic Engineering

    1994.4 - 1996.3

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    Country:Japan

    Notes:3年次編入学

  • Sasebo National College of Technology     Department of Electrical Engineering

    1989.4 - 1994.3

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    Country:Japan

Research Interests・Research Keywords

  • Research theme: Research on three-dimensional positioning using LPWAN in buildings under construction

    Keyword: Positioning, Buildings under construction, LPWAN

    Research period: 2021.4 - Present

  • Research theme: A Machine Learning-based Object Detection Scheme utilizing Channel State Information in Wireless LANs

    Keyword: Machine Learning, Object Detection, Wireless LANs

    Research period: 2019.4 - Present

  • Research theme: Signal processing techniques for Massive MIMO systems

    Keyword: Massive MIMO, OFDM

    Research period: 2015.4 - Present

  • Research theme: Research on MIMO Constant Envelope Modulation

    Keyword: MIMO, Constant Envelope Modulation

    Research period: 2010.4 - 2015.3

  • Research theme: アダプティブアレーアンテナを用いた無線通信システムに関する研究

    Keyword: アダプティブアレーアンテナ、空間分割多重、周波数利用効率

    Research period: 2006.9

  • Research theme: 高周波電力増幅器における非線形歪み補償に関する研究

    Keyword: 移動無線通信、電力増幅器、非線形歪み補償技術

    Research period: 2004.12

  • Research theme: Signal Processing Techniques for Power Line Communication Systems

    Keyword: Power Line Communication (PLC), Multi-Carrier Modulation, Home Network, Highspeed Transmission, Adaptive Equalization

    Research period: 2004.9 - 2009.3

  • Research theme: Research on peak-to-average power ratio reduction techniques for multi-carrier signals

    Keyword: Multi-carrier signal ,Code division multiplexing signal, Peak-to-average power ratio (PAPR), PAPR reduction

    Research period: 2004.5

  • Research theme: マルチキャリア変調方式を用いた高速無線伝送に関する研究

    Keyword: 移動無線通信, マルチキャリア伝送、高速伝送、周波数選択性フェージング

    Research period: 2001.4

Awards

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2023.9   電子情報通信学会 通信ソサイエティ   通信ソサイエティ投稿論文の査読委員としての貢献

  • Best Paper Award

    2022.11   The 10th international symposium on computing and networking (CANDAR'22) in 2022   The best paper award at The 10th international symposium on computing and networking (CANDAR'22) in 2022 Paper title is "Heterogeneous Carrier-Sense Multiple Access for Improved Energy Fairness in LoRaWAN".

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2021.9   電子情報通信学会 通信ソサイエティ   通信ソサイエティ投稿論文の査読委員としての貢献

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2021.9   電子情報通信学会 通信ソサイエティ   通信ソサイエティ研究専門委員会 幹事としての貢献

  • 電子情報通信学会通信ソサイエティ論文賞(Best Paper Award)

    2021.5   電子情報通信学会通信ソサイエティ   IEICE Communications Society Best Paper Award

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2018.9   電子情報通信学会 通信ソサイエティ   通信ソサイエティ投稿論文の査読委員としての貢献

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2018.9   電子情報通信学会 通信ソサイエティ   通信ソサイエティ研究専門委員会 幹事としての貢献

  • 2017年度 電子情報通信学会 通信方式研究会 委員長賞

    2018.4   電子情報通信学会 通信方式研究会   Chairman's award 2017, IEICE Technical Committee of Communication Systems

  • 2015年度 電子情報通信学会 通信方式研究会 委員長賞

    2016.4   電子情報通信学会 通信方式研究会   Chairman's award 2015, IEICE Technical Committee of Communication Systems

  • 電子情報通信学会 通信ソサイエティ活動功労賞

    2015.9   電子情報通信学会   IEICE Communications Society:Distinguished Contributions Award

  • 2014年度 電子情報通信学会 通信方式研究会 委員長賞

    2015.4   電子情報通信学会 通信方式研究会   Chairman's award 2014, IEICE Technical Committee of Communication Systems

  • Best Poster Award, IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XVII)

    2014.4   電子情報通信学会   Best Poster Award, IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XVII)

  • 電子情報通信学会通信ソサイエティ活動功労賞

    2012.9   電子情報通信学会   IEICE Communications Society:Distinguished Contributions Award

  • 電子情報通信学会通信ソサイエティ活動功労賞

    2006.9   電子情報通信学会   IEICE Communications Society:Distinguished Contributions Award

  • 無線通信システム研究会 研究活動奨励賞

    2006.5   電子情報通信学会 無線通信システム研究会   2005 Active Reserach Award in Radio Communication Systems IEICE

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Papers

  • Experimental Evaluation of Device-free Indoor Localization Using Channel State Information in WLAN Systems with Distributed Antennas Invited Reviewed

    Osamu Muta, Junsuke Izumi, Shunsuke Shimizu, Tomoki Murakami, and Shinya Otsuki

    IEICE Transactions on Communications   E107-B ( 12 )   2024.12

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Device-free Indoor WLAN Localization with Distributed Antenna Placement Optimization and Spatially Localized Regression Reviewed International journal

    Osamu Muta, Kazuki Noguchi, Junsuke Izumi, Shunsuke, Shimizu, Tomoki Murakami, Shinya Ohtsuki

    IEEE Transactions on Wireless Communications   23 ( 8 )   9869 - 9883   2024.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    Osamu Muta, Kazuki Noguchi, Junsuke Izumi, Shunsuke, Shimizu, Tomoki Murakami, and Shinya Ohtsuki, "Device-free Indoor WLAN Localization with Distributed Antenna Placement Optimization and Spatially Localized Regression," IEEE Transactions on Wireless Communications, Early Access, Feb. 2024.

    DOI: 10.1109/TWC.2024.3367121

    DOI: 10.1109/TWC.2024.3367121

  • Min-Max Latency Optimization for IRS-aided Cell-Free Mobile Edge Computing Systems Reviewed International journal

    Nana Li, Wanming Hao, Fuhui Zhou, Zheng Chu, Shouyi Yang, Osamu Muta, Haris Gacanin

    IEEE Internet of Things Journal   11 ( 5 )   8757 - 8770   2024.3   ISSN:2327-4662

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Internet of Things Journal  

    Nana Li, Wanming Hao, Fuhui Zhou, Zheng Chu, Shouyi Yang, Osamu Muta, Haris Gacanin, "Min-Max Latency Optimization for IRS-aided Cell-Free Mobile Edge Computing Systems," IEEE Internet of Things Journal, Vol.11, Issue 5, pp. 8757-8770, March 2024.

    DOI: 10.1109/JIOT.2023.3322751

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    Other Link: https://ieeexplore.ieee.org/document/10274472

  • Data-Driven Spectrum Allocation and Power Control for NOMA HetNets Reviewed International journal

    Ahmed Nasser, Osama Elnahas, Osamu Muta, and Zhi Quan

    IEEE Transactions on Vehicular Technology   72 ( 9 )   11685 - 11697   2023.9   ISSN:0018-9545 eISSN:1939-9359

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Transactions on Vehicular Technology  

    Ahmed Nasser, Osama Elnahas, Osamu Muta, and Zhi Quan, "Data-Driven Spectrum Allocation and Power Control for NOMA HetNets," IEEE Transactions on Vehicular Technology, Vol.72, No.9, pp.1168- 11697, Sept. 2023.

    DOI: 10.1109/TVT.2023.3266188

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    Other Link: https://ieeexplore.ieee.org/document/10098661

  • Beamforming Analysis and Design for Wideband THz Reconfigurable Intelligent Surface Communications Reviewed International journal

    Wencai Yan, Wanming Hao, Chongwen Huang, Gangcan Sun, Osamu Muta, Haris Gacanin, and Chau Yuen

    IEEE Journal on Selected Areas in Communications (JSAC)   41 ( 8 )   2306 - 2320   2023.8   ISSN:0733-8716 eISSN:1558-0008

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Journal on Selected Areas in Communications  

    Wencai Yan, Wanming Hao, Chongwen Huang, Gangcan Sun, Osamu Muta, Haris Gacanin, and Chau Yuen,
    "Beamforming Analysis and Design for Wideband THz Reconfigurable Intelligent Surface Communications,"
    IEEE Journal on Selected Areas in Communications (JSAC), Vol.41, Issue 8, pp.2306-2320, Aug. 2023.

    DOI: 10.1109/JSAC.2023.3288235

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    Other Link: https://ieeexplore.ieee.org/document/10159011

  • Device-free WLAN Based Indoor Localization Scheme with Spatially Concatenated CSI and Distributed Antennas Reviewed International journal

    Osamu Muta, Keisuke Takata, Kazuki Noguchi, Tomoki Murakami, and Shinya Ohtsuki

    IEEE Transactions on Vehicular Technology   72 ( 1 )   852 - 865   2023.1   ISSN:0018-9545 eISSN:1939-9359

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Transactions on Vehicular Technology  

    Osamu Muta, Keisuke Takata, Kazuki Noguchi, Tomoki Murakami, and Shinya Ohtsuki, "Device-free WLAN Based Indoor Localization Scheme with Spatially Concatenated CSI and Distributed Antennas," IEEE Transactions on Vehicular Technology, Vol. 72, Issue 1, pp. 852-865, Jan. 2023.

    DOI: 10.1109/TVT.2022.3205767

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    Other Link: https://ieeexplore.ieee.org/document/9887900

    Repository Public URL: https://hdl.handle.net/2324/7174367

  • A Game-Theoretic Approach for Enhancing Security and Data Trustworthiness in IoT Applications Reviewed International journal

    Mohamed S. Abdalzaher, Osamu Muta

    IEEE Internet-of-Things Journal   7 ( 11 )   11250 - 11261   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    Mohamed S. Abdalzaher, Osamu Muta, ``A Game-Theoretic Approach for Enhancing Security and Data Trustworthiness in IoT Applications,'' IEEE Internet-of-Things Journal, Volume 7, Issue 11, pp. 11250-11261, Nov. 2020

    DOI: 10.1109/JIOT.2020.2996671

  • Enhanced Peak Cancellation with Simplified In-Band Distortion Compensation for Massive MIMO-OFDM Reviewed International journal

    #Tomoya Kageyama, @Osamu Muta, @Haris Gacanin

    IEEE Access   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    Tomoya Kageyama, Osamu Muta, Haris Gacanin, ``Enhanced Peak Cancellation with Simplified In-Band Distortion Compensation for Massive MIMO-OFDM'', IEEE Access, Vol.8, pp.73420-73431, July 2020.

  • Performance Analysis of OFDM with Peak Cancellation Under EVM and ACLR Restrictions Reviewed International journal

    #Tomoya Kageyama, @Osamu Muta, @Haris Gacanin

    IEEE Transactions on Vehicular Technology   2020.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    Tomoya Kageyama, Osamu Muta, Haris Gacanin, ``Performance Analysis of OFDM with Peak Cancellation Under EVM and ACLR Restrictions'', IEEE Transactions on Vehicular Technology, Vol. 69, No. 6, pp.6230-6241, June 2020.

  • Performance analysis of precoded MIMO systems with adaptive peak power suppression Invited Reviewed International journal

    Osamu Muta, Tomoya Kageyama

    ITE Transactions on Media Technology and Applications   8 ( 1 )   2 - 10   2020.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    This paper presents two approaches for reducing the peak power in precoded multi-input multi-output (MIMO) systems with space division multiplexing (SDM). First, we present a peak power aware linear precoding scheme for MIMOSDM single carrier systems, where the precoder is designed to restrict per-antenna transmit power below a permissible level while mitigating the performance degradation caused by per-antenna power restriction. Second, we present an analytical method to represent bit error rate (BER) performance of maximum ratio combining (MRC) precoded massive MIMO OFDM systems with adaptive peak cancellation, where peak amplitude is canceled below a given threshold to reduce peak-to-average power ratio (PAPR). With this method, we clarify the impact of adaptive peak cancellation on approximated BER of MRCprecoded massive MIMO OFDM with an arbitrary number of the transmit antennas and users. Numerical results prove that our proposed approaches are effective in restricting the peak power at each antenna while mitigating performance degradation in BER performance of the precoded MIMO-SDM systems.

    DOI: 10.3169/mta.8.2

  • Interference Mitigation and Power Allocation Scheme for Downlink MIMO-NOMA HetNet Reviewed

    Ahmed Nasser, Osamu Muta, Maha Elsabrouty, Haris Gacanin

    IEEE Transactions on Vehicular Technology   68 ( 7 )   6805 - 6816   2019.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    In this paper, a novel interference mitigation and power allocation (PA) scheme is investigated for downlink non-orthogonal multiple access (NOMA) with multiple input multiple output (MIMO) technology in heterogeneous networks (HetNets). The proposed scheme, named PA based interference alignment and coordinated beamforming (PA-IA-CB), consists of two stages. The first stage applies two steps of IA-CB; one step for canceling the inter-cluster and the co-tier interference among small cells, whereas the other step deals with the inter-cluster interference within the macro cell. In the second stage, the cross-tier interference is proposed to be managed by properly handling the allocated power to the macro base station (MBS) and the small base stations (SBSs). The PA problem is modeled as a non-cooperative game between the MBS and the SBS with the aim of increasing the system sum rate. Simulation results verify the efficiency of the proposed technique in terms of total system sum rate and outage probability compared to the conventional schemes.

    DOI: 10.1109/TVT.2019.2918336

  • Price-Based Resource Allocation in Massive MIMO H-CRANs with Limited Fronthaul Capacity Reviewed

    Wanming Hao, Osamu Muta, Haris Gacanin

    IEEE Transactions on Wireless Communications   17 ( 11 )   7691 - 7703   2018.11

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    In this paper, we investigate the bandwidth and power allocation problem in remote radio head cluster (RRHC)-based millimeter wave (mm-wave) massive MIMO heterogeneous cloud radio access networks with limited fronthaul capacity. The coordinated multipoint transmission is applied in each RRHC for cancelling the intra-cluster interference. To avoid the inter-tier interference, distinct bandwidths are allocated to macro base station and RRHs. Following this, we formulate a bandwidth and power allocation optimization problem to maximize the downlink weighted sum rate of the system subject to per-RRHC power and fronthaul capacity constraints, which is a non-convex optimization problem and is difficult to directly solve. Next, we fix the bandwidth allocation and the original problem can be divided into two independent optimization problems, i.e., the weighted sum rate maximization problems of MUs and RRH users, respectively. For the former, the convex optimization technique can be used to solve it. As for the latter, a two-loop iterative algorithm is proposed to deal with it. Specifically, we propose the price-based outer iteration to control the fronthaul capacity and the weighted minimum mean square error-based inner iteration to obtain the power allocation. To this end, a 1-D search method is adopted to find the optimal bandwidth allocation. Finally, numerical results are conducted to verify the effectiveness of the proposed algorithms under different parameters.

    DOI: 10.1109/TWC.2018.2869749

  • Dynamic Small Cell Clustering and Non-Cooperative Game-Based Precoding Design for Two-Tier Heterogeneous Networks with Massive MIMO Reviewed

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEEE Transactions on Communications   66 ( 2 )   675 - 687   2018.2

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    In this paper, we investigate the dynamic small cell (SC) clustering strategy and their precoding design problem for interference coordination in two-Tier heterogeneous networks (HetNets) with massive MIMO (mMIMO). To reduce interference among different SCs, an interference graph-based dynamic SC clustering scheme is proposed. Based on this, we formulate an optimization problem as design precoding weights at macro base station (MBS) and clustered SCs for maximizing the downlink sum rate of SC users (SUs) subject to the power constraint of each SC BS (SBS), while mitigating inter-cluster, eliminating inter-Tier, intra-cluster and multi-macro user (MU) interference. To eliminate the inter-Tier and multi-MU interference simultaneously, we propose a clustered SC block diagonalization precoding scheme for the MBS. Next, each SU's precoding vector at clustered SCs is designed as the product of the following two parts. The first part is designed with singular value decomposition to remove the intra-cluster interference. The second part is designed to coordinate the inter-cluster interference for maximizing the downlink sum rate of SUs, which is a non-convex optimization problem and difficult to solve directly. A non-cooperative game-based distributed algorithm is proposed to obtain a suboptimal solution. Meanwhile, we prove the existence and uniqueness of Nash equilibrium for the formed game. Finally, simulation results verify the effectiveness of our proposed schemes.

    DOI: 10.1109/TCOMM.2017.2756934

  • Performance of RSS-Based Indoor Cooperative Positioning with Weighted User-Terminal Collaboration Reviewed

    Zhuoran Li, Osamu Muta, Yutaka Jitsumatsu

    Proc. International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC) 2024   2024.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

  • In-band Distortion Compensation for Peak Cancellation Based PAPR Reduction in Massive MIMO-OFDM with Uniform Planar Array Reviewed

    Zhouran Li, Riku Nojima, Osamu Muta, Mirena Omoto, Tomofumi Makita, and Kazuki Maruta

    IEEE Access   12   156118 - 156130   2024.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2024.3485733

  • Deep Reinforcement Learning Based Computing Resource Allocation in Fog Radio Access Networks Reviewed International coauthorship

    Tong Zhaowei, Zhuoran Li, Ahmad Gendia, Osamu Muta

    Proc. IEEE Vehicular Technology Conference Fall 2024   2024.10

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  • Experimental Evaluation of WLAN-based Object Detection Using CSI in Outdoor and Large-scale Indoor Environments Reviewed

    Shunsuke Shimizu, Osamu Muta, Shinya Otsuki, Tomoki Murakami, Hanae Otani

    Proc. IEEE Vehicular Technology Conference Fall 2024   2024.10

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  • Self-Supervised Zero-Shot Noise2Noise Framework for Improved Channel Estimation in RIS-Aided Multi-user Systems Reviewed International coauthorship

    Justine M Mdali, Mohammed Abo-Zahhad, Ahmed Hassan Abd El-Malek, Osamu Muta, Maha Elsabrouty

    Proc. The 20th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob2024)   2024.10

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  • Toward Improved Energy Fairness in CSMA-Based LoRaWAN Reviewed

    Chenglong Shao, Osamu Muta, Kazuya Tsukamoto, Wonjun Lee, Xianpeng Wang, Malvin Nkomo, and Kapil R. Dandekar

    IEEE-ACM TRANSACTIONS ON NETWORKING   32 ( 5 )   4382 - 4397   2024.10   ISSN:1063-6692 eISSN:1558-2566

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE/ACM Transactions on Networking  

    This paper proposes a heterogeneous carrier-sense multiple access (CSMA) protocol named LoHEC as the first research attempt to improve energy fairness when applying CSMA to long-range wide area network (LoRaWAN). LoHEC is enabled by Channel Activity Detection (CAD), a recently introduced carrier-sensing technique to detect LoRaWAN signals even below the noise floor. The design of LoHEC is inspired by the fact that existing CAD-based CSMA proposals are in a homogeneous manner. In other words, they require LoRaWAN end devices to perform identical CAD regardless of the differences of their used network parameter &#x2013; spreading factor (SF). This causes energy consumption imbalance among end devices since the consumed energy during CAD is significantly affected by SF. By considering the heterogeneity of LoRaWAN in terms of SF, LoHEC requires end devices to perform different numbers of CAD operations with different CAD intervals during channel access. Particularly, the number of needed CADs and CAD interval are determined based on the CAD energy consumption under different SFs. We conduct extensive experiments regarding LoHEC with a practical LoRaWAN testbed including 60 commercial off-the-shelf end devices. Experimental results show that in comparison with the existing solutions, LoHEC can achieve up to 0.85<inline-formula> <tex-math notation="LaTeX">$\times$</tex-math> </inline-formula> improvement of the energy fairness on average.

    DOI: 10.1109/TNET.2024.3418913

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  • Multiple Access in Large-Scale LoRaWAN: Challenges, Solutions, and Future Perspectives Reviewed International journal

    Chenglong Shao, Osamu Muta, Qinghe Du, Kapil R. Dandekar, Xianpeng Wang

    IEEE Consumer Electronics Magazine   13 ( 5 )   36 - 46   2024.9   ISSN:2162-2248 eISSN:2162-2256

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Consumer Electronics Magazine  

    Chenglong Shao, Osamu Muta, Qinghe Du, Kapil R. Dandekar, Xianpeng Wang, "Multiple Access in Large-Scale LoRaWAN: Challenges, Solutions, and Future Perspectives," IEEE Consumer Electronics Magazine, Early Access, June 2022.

    DOI: 10.1109/MCE.2022.3182518

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    Other Link: https://ieeexplore.ieee.org/document/9795666

  • Task Offloading and Resource Allocation in an RIS-assisted NOMA-based Vehicular Edge Computing Reviewed International coauthorship

    Abdul-baaki Yakubu, Ahmed H. Abd el-malek, Mohammed Abo-Zahhad, Osamu Muta, and Maha M. Elsabrouty

    IEEE Access   12   124330 - 124348   2024.9   ISSN:2169-3536 eISSN:2169-3536

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2024.3454810

    DOI: 10.1109/ACCESS.2024.3454810

    Other Link: https://ieeexplore.ieee.org/document/10666695

  • Experimental evaluation of quasi-ZF-based fast beamforming method for short-range MIMO transmission Reviewed International journal

    Kazumitsu Sakamoto, Osamu Muta

    IEICE Transactions on Communications (Japanese Edition)   J107-B ( 7 )   371 - 373   2024.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    Kazumitsu Sakamoto, and Osamu Muta, "Experimental evaluation of quasi-ZF-based fast beamforming method for short-range MIMO transmission," IEICE Transactions on Communications (JB), Vol.J107-B, No.7, pp.-, July 2024

    DOI: 10.14923/transcomj.2023BLL0005

    DOI: 10.14923/transcomj.2023BLL0005

    Other Link: https://search.ieice.org/bin/summary.php?id=j107-b_7_371

  • Joint User Association and Pairing in Multi-UAV-assisted NOMA Networks: A Decaying-epsilon Thompson Sampling Framework Reviewed International coauthorship International journal

    Boniface Uwizeyimana, Mohammed Abo-Zahhad, Osamu Muta, Ahmed H. Abd El-Malek EL-MALEK, and Maha M. Elsubrouty

    IEEE Access   12   87167 - 87180   2024.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE  

    DOI: 10.1109/ACCESS.2024.3417320

    Other Link: https://ieeexplore.ieee.org/document/10565893

  • Energy-Efficient Trajectory Planning with Joint Device Selection and Power Splitting for mmWaves-Enabled UAV-NOMA Networks Reviewed International journal

    Ahmad Gendia, Osamu Muta, Sherief Hashima, and Kohei Hatano

    Transactions on Machine Learning in Communications and Networking   ( 2 )   617 - 632   2024.5

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    Ahmad Gendia, Osamu Muta, Sherief Hashima, and Kohei Hatano, "Energy-Efficient Trajectory Planning with Joint Device Selection and Power Splitting for mmWaves-Enabled UAV-NOMA Networks, " IEEE Transactions on Machine Learning in Communications and Networking, Vol.2, pp.617-632, May 2024.

    DOI: 10.1109/TMLCN.2024.3396438

    Other Link: https://ieeexplore.ieee.org/document/10517756

    Repository Public URL: https://hdl.handle.net/2324/7238753

  • TONARI: Reactive Detection of Close Physical Contact using Unlicensed LPWAN Signals Reviewed International journal

    Chenglong Shao, Osamu Muta

    ACM Transactions on Internet of Things   5 ( 2 )   1 - 30   2024.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    Chenglong Shao, and Osamu Muta, "TONARI: Reactive Detection of Close Physical Contact using Unlicensed LPWAN Signals," ACM Transactions on Internet of Things, accepted in Feb. 2024.

    DOI: 10.1145/3648572

  • Age of Information Analysis for Full Duplex Cooperative SWIPT NOMA System Reviewed International journal

    Simon Kaboyo, Ahmed Hassan Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty

    IEEE Wireless Communications and Networking Conference (WCNC2024)   2024.4

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    Simon Kaboyo, Ahmed Hassan Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty, "Age of Information Analysis for Full Duplex Cooperative SWIPT NOMA System," IEEE Wireless Communications and Networking Conference (WCNC2024), April 2024.

  • Antenna Position Estimation Based on Weighted Centroid Localization for Short-range MIMO Transmission Reviewed International journal

    Kazumitsu Sakamoto, Osamu Muta

    IEICE Communications Express   13 ( 2 )   14 - 17   2024.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    Kazumitsu Sakamoto, and Osamu Muta, "Antenna Position Estimation Based on Weighted Centroid Localization for Short-range MIMO Transmission," IEICE Communications Express, Vol.13, No.2, 14–17, Feb. 2024.

  • When LoRaWAN Meets CSMA: Trends, Challenges, and Opportunities Reviewed International journal

    Chenglong Shao, and Osamu Muta

    IEEE Internet of Things Magazine   2024.1

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  • Joint User Association and Pairing in Multi-UAV- Assisted NOMA Networks: A Decaying-Epsilon Thompson Sampling Framework

    Uwizeyimana, B; Abo-Zahhad, M; Muta, O; Abd El-Malek, AH; Elsabrouty, MM

    IEEE ACCESS   12   87167 - 87180   2024   ISSN:2169-3536

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    Publisher:IEEE Access  

    Unmanned aerial vehicles (UAVs) are expected to be integrated into future wireless networks to offer services, especially in unreachable or congested areas. To improve the spectral efficiency, non-orthogonal multiple access (NOMA) scheme can be utilised within the UAV communication to allow more users to be covered and associated. The performance of the NOMA-UAVs network is governed by several factors including power allocation, user association and pairing methods. This paper presents an approach that uses multi-armed bandit (MAB) and two-sided matching frameworks to maximize the throughput of multi-UAV-assisted NOMA networks in a decentralized manner. The approach enables the UAVs to propose to the ground users (GUs) without explicit cooperation among the UAVs while the GUs can accept or reject the proposals. To this end, we propose a modified Thompson sampling algorithm that we named decaying epsilon Thompson sampling (text {D}epsilon text {TS} ) MAB algorithm that is designed to improve the exploration-exploitation tradeoff in the MAB. The performance of the proposed text {D}epsilon text {TS} MAB algorithm is evaluated against other existing MAB techniques. Simulation results show that the text {D}epsilon text {TS} algorithm attains faster convergence and improved performance in terms of smaller regret and increased achievable system throughput. The text {D}epsilon text {TS} MAB algorithm particularly excels in regards of the convergence rate when the number of available action spaces increases.

    DOI: 10.1109/ACCESS.2024.3417320

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    Scopus

  • Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration Reviewed International journal

    #Zhuoran Li, @Osamu Muta and @Yutaka Jitsumatsu

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023   2023.12

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    Zhuoran Li, Osamu Muta and Yutaka Jitsumatsu, "Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration," International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023, Dec. 2023.

  • Experimental Study on Microwave Heating of Soil for Nematode Control Reviewed International journal

    Tanemasa Asano, Hideaki Iwahori, Ahmed Allam, Osamu Muta, Haruichi Kanaya and Adel B. Abdel-Rahman

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023   2023.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    Tanemasa Asano, Hideaki Iwahori, Ahmed Allam, Osamu Muta, Haruichi Kanaya and Adel B. Abdel-Rahman, "Experimental Study on Microwave Heating of Soil for Nematode Control," International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023, Dec. 2023.

  • A Multi-agent Multi-armed Bandit Approach for User Pairing in UAV-assisted NOMA-Networks Reviewed International journal

    Boniface Uwizeyimana, Ahmed H. Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty

    Proc. the 10th International Symposium on Networks, Computers and Communications (ISNCC'23)   2023.10

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    Boniface Uwizeyimana, Ahmed H. Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty, "A Multi-agent Multi-armed Bandit Approach for User Pairing in UAV-assisted NOMA-Networks," Proc. the 10th International Symposium on Networks, Computers and Communications (ISNCC'23), Oct. 2023.

  • Multiuser Scheduling to Improve Iterative Interference Replica Subtraction with Partial Zeroization for Massive MIMO Systems Reviewed International journal

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta

    2023 International Conference On Advanced Technologies For Communications (ATC2023)   2023.10

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    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta, "Multiuser Scheduling to Improve Iterative Interference Replica Subtraction with Partial Zeroization for Massive MIMO Systems," 2023 International Conference On Advanced Technologies For Communications (ATC2023), Oct. 2023.

  • Experimental Evaluation of MIMO-WLAN-based Object Detection with Reflectors Reviewed International journal

    #Shunsuke Shimizu, @Osamu Muta, #Kazuki Noguchi, #Junsuke Izumi, @Tomoki Murakami, @Shinya Otsuki

    Proc. IEEE Vehicular Technology Conference 2023 Fall (VTC2023-Fall)   2023.10

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    Shunsuke Shimizu, Osamu Muta, Kazuki Noguchi, Junsuke Izumi, Tomoki Murakami, and Shinya Otsuki, "Experimental Evaluation of MIMO-WLAN-based Object Detection with Reflectors," Proc. IEEE Vehicular Technology Conference 2023 Fall (VTC2023-Fall), Oct. 2023.

  • Performance of WLAN-based Object Detection with Distributed Antenna and Spatially Concatenated CSI Reviewed International journal

    #Shunsuke Shimizu, @Osamu Muta, #Kazuki Noguchi, @Tomoki Murakami, and @Shinya Otsuki

    IEEE VTC2023Fall Workshop   2023.10

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    Shunsuke Shimizu, Osamu Muta, Kazuki Noguchi, Tomoki Murakami, and Shinya Otsuki, "Performance of WLAN-based Object Detection with Distributed Antenna and Spatially Concatenated CSI," IEEE VTC2023-Fall Workshop (Workshop on Integrated Sensing, Communication, and Computation towards 6G held at VTC2023-Fall), Oct. 2023.

  • Investigation on Microwave Heating Characteristic of Watery Object Buried in Soil Reviewed International journal

    Tanemasa Asano, Ahmed Allam, Osamu Muta, Haruichi Kanaya, Adel B. Abdel-Rahman

    International Japan-Africa Conference on Electronics, Communications and Computations 2022   2022.12

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    Tanemasa Asano, Ahmed Allam, Osamu Muta, Haruichi Kanaya, Adel B. Abdel-Rahman, "Investigation on Microwave Heating Characteristic of Watery Object Buried in Soil," International Japan-Africa Conference on Electronics, Communications and Computations 2022, Dec. 2022.

  • Multi-Armed Bandit and Repeated Auction Approaches for User Admission and Channel Allocation in 5G HetNets Reviewed International journal

    Boniface Uwizeyimana, Ahmed Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad and Maha Elsabrouty,

    International Japan-Africa Conference on Electronics, Communications and Computations 2022   2022.12

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    Boniface Uwizeyimana, Ahmed Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad and Maha Elsabrouty,
    Multi-Armed Bandit and Repeated Auction Approaches for User Admission and Channel Allocation in 5G HetNets ,"
    International Japan-Africa Conference on Electronics, Communications and Computations 2022, Dec. 2022.

  • Improving Iterative Interference Replica Subtraction based Precoding for Massive MIMO Systems by Partial Zeroization Reviewed International journal

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta

    2023 IEEE 20th Consumer Communications & Networking Conference (CCNC)   2022.12

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    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta, "Improving Iterative Interference Replica Subtraction based Precoding for Massive MIMO Systems by Partial Zeroization," 2023 IEEE 20th Consumer Communications & Networking Conference (CCNC).

  • Heterogeneous Carrier-Sense Multiple Access for Improved Energy Fairness in LoRaWAN Reviewed International journal

    Chenglong Shao, Osamu Muta

    The Tenth International Symposium on Computing and Networking (CANDAR) 2022   2022.11

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  • Joint Peak Cancellation and In-band Distortion Compensation Scheme for Precoded Massive MIMO-OFDM with Uniform Planar Array Reviewed International journal

    #Riku Nojima, @Osamu Muta, #Tomofumi Makita, @Kazuki Maruta

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022   2022.9

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    Riku NOJIMA, Osamu MUTA, Tomofumi MAKITA, Kazuki MARUTA, "Joint Peak Cancellation and In-band Distortion Compensation Scheme for Precoded Massive MIMO-OFDM with Uniform Planar Array," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • Experimental Evaluation of Floor Height Estimation Using Unlicensed-Band LPWA Signals Toward Three-Dimensional NLOS Indoor Positioning Reviewed International journal

    #Kyosuke Nakano, @Osamu Muta, #Takahiro Inoue, @Takuto Watanabe, @Naohiro Ikeda

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022   2022.9

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    Kyosuke Nakano, Osamu Muta, Takahiro Inoue, Takuto Watanabe, Naohiro Ikeda, "Experimental Evaluation of Floor Height Estimation Using Unlicensed-Band LPWA Signals Toward Three-Dimensional NLOS Indoor Positioning," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • UAV Positioning with Joint NOMA Power Allocation and Receiver Node Activation Reviewed International journal

    #Gendia Ahmad, @Muta Osamu, @Hashima Sherief, @Hatano Kohei

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022   2022.9

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    Gendia Ahmad, Muta Osamu, Hashima Sherief, Hatano Kohei, "UAV Positioning with Joint NOMA Power Allocation and Receiver Node Activation," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • Compressed Sensing based Power Allocation and User Selection with Adaptive Resource Block Selection for Downlink NOMA Systems Reviewed International journal

    #Tomofumi Makita, Osamu Muta

    IEICE Transactions on Communications, Vol.E105-B,No.8,pp.959-968, Aug. 2022.   E105-B ( 8 )   959 - 968   2022.8

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    Tomofumi Makita, Osamu Muta,
    "Compressed Sensing based Power Allocation and User Selection with Adaptive Resource Block Selection for Downlink NOMA Systems,"
    IEICE Transactions on Communications, Vol.E105-B,No.8,pp.959-968, Aug. 2022.

    DOI: https://doi.org/10.1587/transcom.2021EBP3173

  • LiCo: Toward Lightweight Resolution of Signal Collisions in LoRaWAN Reviewed International journal

    @Chenglong Shao, @Osamu Muta

    IEEE Communications Letters   26 ( 8 )   1957 - 1961   2022.8   ISSN:1089-7798 eISSN:1558-2558

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE Communications Letters  

    Chenglong Shao, Osamu Muta, "LiCo: Toward Lightweight Resolution of Signal Collisions in LoRaWAN", IEEE Communications Letters, Vol. 26, Issue: 8, pp. 1957 - 1961, August 2022.

    DOI: 10.1109/LCOMM.2022.3178208

    Web of Science

    Scopus

  • Intelligent Reflecting Surface Joint Uplink-Downlink Optimization for NOMA Network Reviewed International journal

    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty

    IEEE Vehicular Technology Conference Spring 2022   2022.6

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    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty, "Intelligent Reflecting Surface Joint Uplink-Downlink Optimization for NOMA Network," IEEE Vehicular Technology Conference Spring 2022, June. 2022.

  • Cache-Enabled Reinforcement Learning Scheme for Power Allocation and User Selection in Opportunistic Downlink NOMA Transmissions Reviewed International journal

    #Ahmad Gendia, @Osamu Muta, @Ahmed Nasser

    IEEJ Transactions on Electrical and Electronic Engineering   17 ( 5 )   722 - 731   2022.5   ISSN:1931-4973 eISSN:1931-4981

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEJ Transactions on Electrical and Electronic Engineering  

    ``Cache-Enabled Reinforcement Learning Scheme for Power Allocation and User Selection
    in Opportunistic Downlink NOMA Transmissions,'' IEEJ Transactions on Electrical and Electronic Engineering, Vol. 17, Issue 5, pp. 722-731, May 2022

    DOI: 10.1002/tee.23560

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    Scopus

  • Toward Ubiquitous Connectivity via LoRaWAN: An Overview of Signal Collision Resolving Solutions Reviewed International journal

    Chenglong Shao, Osamu Muta, Wenjie Wang, and Wonjun Lee

    IEEE Internet of Things Magazine   4 ( 4 )   114 - 119   2021.12

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    Chenglong Shao, Osamu Muta, Wenjie Wang, and Wonjun Lee,
    ``Toward Ubiquitous Connectivity via LoRaWAN: An Overview of Signal Collision Resolving Solutions,''
    IEEE Internet of Things Magazine, Volume 4 Issue 4, pp.114 - 119, Dec. 2021.

    DOI: 10.1109/IOTM.001.2100114

  • VirCh: Virtual Mobile Charger-based Wireless Power Transfer for Large-Scale Internet-of-Things Systems Reviewed International journal

    Chenglong SHAO and Osamu MUTA

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)   2021.12

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    Chenglong SHAO and Osamu MUTA
    VirCh: Virtual Mobile Charger-based Wireless Power Transfer for Large-Scale Internet-of-Things Systems
    2021 International Conference on Emerging Technologies for Communications (ICETC 2021), Dec. 2021.

  • Adaptive In-band Distortion Compensation for Spatially Precoded Massive MU-MIMO Systems with Deep Peak Cancellation Invited Reviewed International journal

    #Hiroki HASE, and @Osamu MUTA,

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)   2021.12

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    Hiroki HASE, and Osamu MUTA,
    Adaptive In-band Distortion Compensation for Spatially Precoded Massive MU-MIMO Systems with Deep Peak Cancellation
    2021 International Conference on Emerging Technologies for Communications (ICETC 2021), Dec. 2021.

  • Performance Analysis of Intelligent Reflecting Surface Selection for Orthogonal and Non-Orthogonal Multiple Access Reviewed International journal

    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty

    International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob) 2021   2021.10

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    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty,
    'Performance Analysis of Intelligent Reflecting Surface Selection for Orthogonal and Non-Orthogonal Multiple Access'
    International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob)
    October 11 to 13, 2021.

  • Non-Cooperative Game Based Power Allocation for Energy and Spectrum Efficient Downlink NOMA HetNets Reviewed International journal

    #Ahmed Nasser, @Osamu Muta, @Maha Elsabrouty, and @Haris Gacanin

    IEEE Access   9   136334 - 136345   2021.9

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    Ahmed Nasser, Osamu Muta, Maha Elsabrouty, and Haris Gacanin, "Non-Cooperative Game Based Power Allocation for Energy and Spectrum Efficient Downlink NOMA HetNets ", IEEE Access, Vol. 9, pp. 136334-136345, Sept. 2021.

    DOI: 10.1109/ACCESS.2021.3116706

  • A CSI-based Object Detection Scheme using Interleaved Subcarrier Selection in Wireless LAN Systems with Distributed Antennas Reviewed International journal

    #Kazuki Noguchi, @Osamu Muta, @Tomoki Murakami, @Shinya Otsuki

    Vehicular Technology Conference Fall 2021   2021.9

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    Kazuki Noguchi, Osamu Muta, Tomoki Murakami, and Shinya Otsuki
    A CSI-based Object Detection Scheme using Interleaved Subcarrier Selection in Wireless LAN Systems with Distributed Antennas
    Vehicular Technology Conference Fall 2021, Sept. 2021.

  • QoS-aware Low-complexity User Pairing Based on Compressed Sensing in Downlink NOMA Reviewed International journal

    #Tomofumi Makita, @Osamu Muta

    IEEE Vehicular Technology Conference Fall 2021   2021.9

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    Tomofumi Makita and Osamu Muta, "QoS-aware Low-complexity User Pairing Based on Compressed Sensing in Downlink NOMA,' IEEE Vehicular Technology Conference Fall 2021, Sept. 2021.

  • Dude, Are You Approaching Me? Detecting Close Physical Contact via Unlicensed LPWAN Signals Reviewed International journal

    @Chenglong Shao, @Osamu Muta

    IEEE ICC 2021 Workshop   2021.6

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    Chenglong Shao and Osamu Muta,
    ``Dude, Are You Approaching Me? Detecting Close Physical Contact via Unlicensed LPWAN Signals,''
    IEEE ICC 2021 Workshop - IoMT, June 2021.

  • Partial Scrambling Overlapped Selected Mapping PAPR Reduction for OFDM/OQAM Systems Reviewed International journal

    #Tomoya Kageyama, @Osamu Muta

    IEICE Transactions on Communications   E104-B ( 3 )   338 - 347   2021.3

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    Tomoya Kageyama, Osamu Muta, ``Partial Scrambling Overlapped Selected Mapping PAPR Reduction for OFDM/OQAM Systems,''
    IEICE Transactions on Communications, Vol.E104-B, No.3, pp.338-347, Mar. 2021.

    DOI: 10.1587/transcom.2020EBP3042

  • Joint User Pairing and Power Allocation with Compressive Sensing in NOMA Systems Reviewed International journal

    #Ahmed Nasser, @Osamu Muta, @Maha Elsabrouty, @Haris Gacanin

    IEEE Wireless Communications Letters   10 ( 1 )   151 - 155   2021.1

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    Ahmed Nasser, Osamu Muta, Maha Elsabrouty, Haris Gacanin,
    ``Joint User Pairing and Power Allocation with Compressive Sensing in NOMA Systems,''
    IEEE Wireless Communications Letters, Vol. 10, No. 1, Jan. 2021.

    DOI: 10.1109/LWC.2020.3023619

  • An Interleaved Channel State Information Clustering Scheme for Wireless LAN-based Object Detection Systems Reviewed International journal

    #Hiroki Senji, @Osamu Muta, @Tomoki Murakami, @Shinya Otsuki

    IEICE Communications Express   10 ( 1 )   42 - 49   2021.1

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    Hiroki Senji, Osamu Muta, Tomoki Murakami, Shinya Otsuki, ``An Interleaved Channel State Information Clustering Scheme for Wireless LAN-based Object Detection Systems,'' IEICE Communications Express, Vol.10, No.1, pp. 42–49, 2021.

  • Improving Low Complexity Inter-User Interference Cancellation for Massive MIMO Systems Reviewed International journal

    Kazuki MUKAI, Kazuki MARUTA, Osamu MUTA, and Chang-Jun AHN

    International Conference on Emerging Technologies for Communications (ICETC 2020)   2020.12

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    Kazuki MUKAI, Kazuki MARUTA, Osamu MUTA, and Chang-Jun AHN, ``Improving Low Complexity Inter-User Interference Cancellation for Massive MIMO Systems,'' International Conference on Emerging Technologies for Communications (ICETC 2020), Dec. 2020.

  • Performance Evaluation of Object Detection Utilizing Channel State Information in Wireless LAN Systems with Distributed Antennas Reviewed International journal

    Keisuke Takata, Osamu Muta, Tomoki Murakami, Shinya Otsuki

    23rd International Symposium on Wireless Personal Multimedia Communications (WPMC2020)   2020.10

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    Keisuke Takata, Osamu Muta, Tomoki Murakami, Shinya Otsuki, ``Performance Evaluation of Object Detection Utilizing Channel State Information in Wireless LAN Systems with Distributed Antennas,'' 23rd International Symposium on Wireless Personal Multimedia Communications (WPMC2020), Oct. 2020.

  • Effect of Hysteresis-based Simple Negative Feedback A/D Conversion on Channel Estimation for Single Carrier Systems Reviewed International journal

    Tomoya Kageyama, Daisuke Kanemoto, Oruto Endo, Makoto Ohki, Osamu Muta

    IEICE Communications Express   2020.7

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    Tomoya Kageyama, Daisuke Kanemoto, Oruto Endo, Makoto Ohki, Osamu Muta, ``Effect of Hysteresis-based Simple Negative Feedback A/D Conversion on Channel Estimation for Single Carrier,'' IEICE Communications Express, Vol.9, No.7, 274-281, July 2020.

  • Cross-tier Interference Mitigation Considering Pilot Overhead for TDD MIMO Heterogeneous Networks Reviewed International journal

    Shunsuke Kamiwatari, Osamu Muta

    IEICE Communications Expres   2020.6

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    Shunsuke Kamiwatari, Osamu Muta, ``Cross-tier Interference Mitigation Considering Pilot Overhead for TDD MIMO Heterogeneous Networks'', IEICE Communications Express, Vol.9, No.6, pp.1-8, June 2020.

  • Performance Analysis of Weighted Rank Constrained Rank Minimization Interference Alignment for Three-Tier Downlink Heterogeneous Networks Reviewed International journal

    A. M. Benaya, Osamu Muta, Maha Elsabrouty

    IEICE Transactions on Communications   Vol.E103-B ( 3 )   262 - 271   2020.3

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    A. M. Benaya, Osamu Muta, Maha Elsabrouty, ``Performance Analysis of Weighted Rank Constrained Rank Minimization Interference Alignment for Three-Tier Downlink Heterogeneous Networks,'' IEICE Transactions on Communications, Vol.E103-B, No.3, pp.262-271, March 2020.

  • Coordinated Hybrid Precoding Design in Millimeter Wave Fog-RAN Reviewed

    Wanming Hao, Gangcan Sun, Osamu Muta, Jiankang Zhang, Shouyi Yang

    IEEE Systems Journal   14 ( 1 )   673 - 676   2020.3

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    In this paper, we propose a femto base station cluster (FBSC)-based fog radio access network (F-RAN) structure, where multiple femto base stations (FBSs) coordinately serve users in each FBSC with the millimeter wave band. In addition, the FBS head (FBSH) in each FBSC receives data from the central processor (CP) via fronthaul link with the microwave band. Based on this, we formulate a transmission delay minimization problem by optimizing coordinated hybrid analog/digital precoding under transmit power constraints of each FBS in the FBSCs and the base station (BS) in the CP. Then, we propose a coordinated analog precoding scheme for multiple FBSs within the same FBSC. Meanwhile, we equivalently divide the original problem into two independent optimization problems, and propose an effective iterative algorithm to solve them. Simulation results show the effectiveness of our proposed algorithms.

    DOI: 10.1109/JSYST.2019.2921557

  • Fast matrix inversion methods based on Chebyshev and Newton iterations for zero forcing precoding in massive MIMO systems Reviewed International journal

    Sherief Hashima, Osamu Muta

    Eurasip Journal on Wireless Communications and Networking   2020 ( 1 )   2020.2

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    In massive MIMO (mMIMO) systems, large matrix inversion is a challenging problem due to the huge volume of users and antennas. Neumann series (NS) and successive over relaxation (SOR) are two typical methods that solve such a problem in linear precoding. NS expands the inverse of a matrix into a series of matrix vector multiplications, while SOR deals with the same problem as a system of linear equations and iteratively solves it. However, the required complexities for both methods are still high. In this paper, four new joint methods are presented to achieve faster convergence and lower complexity in matrix inversion to determine linear precoding weights for mMIMO systems, where both Chebyshev iteration (ChebI) and Newton iteration (NI) are investigated separately to speed up the convergence of NS and SOR. Firstly, joint Chebyshev and NS method (ChebI-NS) is proposed not only to accelerate the convergence in NS but also to achieve more accurate inversion. Secondly, new SOR-based approximate matrix inversion (SOR-AMI) is proposed to achieve a direct simplified matrix inversion with similar convergence characteristics to the conventional SOR. Finally, two improved SOR-AMI methods, NI-SOR-AMI and ChebI-SOR-AMI, are investigated for further convergence acceleration, where NI and ChebI approaches are combined with the SOR-AMI, respectively. These four proposed inversion methods provide near optimal bit error rate (BER) performance of zero forcing (ZF) case under uncorrelated and correlated mMIMO channel conditions. Simulation results verify that the proposed ChebI-NS has the highest convergence rate compared to the conventional NS with similar complexity. Similarly, ChebI-SOR-AMI and NI-SOR-AMI achieve faster convergence than the conventional SOR method. The order of the proposed methods according to the convergence speed are ChebI-SOR-AMI, NI-SOR-AMI, SOR-AMI, then ChebI-NS, respectively. ChebI-NS has a low convergence because NS has lower convergence than SOR. Although ChebI-SOR-AMI has the fastest convergence rate, NI-SOR-AMI is preferable than ChebI-SOR-AMI due to its lower complexity and close inversion result.

    DOI: 10.1186/s13638-019-1631-x

  • Performance analysis ofweighted rank constrained rank minimization interference alignment for three-tier downlink heterogeneous networks Reviewed

    Ahmed M. Benaya, Osamu Muta, Maha Elsabrouty

    IEICE Transactions on Communications   E103B ( 3 )   262 - 271   2020.1

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    Heterogeneous networks (HetNets) technology is expected to be applied in next generation cellular networks to boost system capacity. However, applying HetNets introduces a significant amount of interference among different tiers within the same cell. In this paper, we propose a weighted rank constrained rank minimization (WRCRM) based interference alignment (IA) approach for three-tier HetNets. The concept of RCRM is applied in a different way to deal with the basic characteristic of different tiers: Their different interference tolerance. In the proposed WRCRM approach, interference components at different tiers are weighted with different weighting factors (WFs) to reflect their vulnerability to interference. First, we derive an inner and a loose outer bound on the achievable degrees of freedom (DoF) for the three-tier system that is modeled as a three-user mutually interfering broadcast channel (MIBC). Then, the derived bounds along with the well-known IA feasibility conditions are used to show the effectiveness of the proposed WRCRM approach. Results show that there exist WF values that maximize the achievable interference-free dimensions. Moreover, adjusting the required number of DoF according to the derived bounds improves the performance of the WRCRM approach.

    DOI: 10.1587/transcom.2019EBP3084

  • A Partial Scrambling Overlapped Selected Mapping PAPR Reduction Scheme for OFDM/OQAM Systems

    Tomoya Kageyama, Osamu Muta

    7th International Japan-Africa Conference on Electronics, Communications and Computations, JAC-ECC 2019 Proceedings of the International Japan-Africa Conference on Electronics, Communications and Computations, JAC-ECC 2019   37 - 40   2019.12

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    As a spectrum efficient multi-carrier modulation scheme, filter-bank based orthogonal frequency division multiplexing techniques using offset quadrature amplitude modulation (OFDM/OQAM) are investigated for future wireless communication systems, where a low-sidelobe spectrum is achieved by band-limiting each subcarrier while keeping their orthogonality. One of the technical issues in OFDM/OQAM is the suppression of the peak-to-average power ratio (PAPR). Since existing PAPR reduction schemes for traditional OFDM are not straightforwardly applicable to OFDM/OQAM systems, PAPR suppression for OFDM/OQAM is still a challenging issue. This paper proposes a partial scrambling overlapped selected mapping (PS-OSLM) technique for OFDM/OQAM systems, where a partial scrambling technique is applied to an overlapped SLM scheme which selects the best candidate sequence among possible overlapped candidate sequences so as to minimize the PAPR. It is verified by simulation that the proposed PS-OSLM effectively reduce PAPR of OFDM/OQAM signal without explicit side information while improving bit error rate (BER) performance compared with conventional schemes.

    DOI: 10.1109/JAC-ECC48896.2019.9051096

  • Codebook-Based Max-Min Energy-Efficient Resource Allocation for Uplink mmWave MIMO-NOMA Systems Reviewed

    Wanming Hao, Ming Zeng, Gangcan Sun, Osamu Muta, Octavia A. Dobre, Shouyi Yang, Haris Gacanin

    IEEE Transactions on Communications   67 ( 12 )   8303 - 8314   2019.12

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    In this paper, we investigate the energy-efficient resource allocation problem in an uplink non-orthogonal multiple access (NOMA) millimeter wave system, where the fully-connected-based sparse radio frequency chain antenna structure is applied at the base station (BS). To relieve the pilot overhead for channel estimation, we propose a codebook-based analog beam design scheme, which only requires to obtain the equivalent channel gain. On this basis, users belonging to the same analog beam are served via NOMA. Meanwhile, an advanced NOMA decoding scheme is proposed by exploiting the global information available at the BS. Under predefined minimum rate and maximum transmit power constraints for each user, we formulate a max-min user energy efficiency (EE) optimization problem by jointly optimizing the detection matrix at the BS and transmit power at the users. We first transform the original fractional objective function into a subtractive one. Then, we propose a two-loop iterative algorithm to solve the reformulated problem. Specifically, the inner loop updates the detection matrix and transmit power iteratively, while the outer loop adopts the bi-section method. Meanwhile, to decrease the complexity of the inner loop, we propose a zero-forcing (ZF)-based iterative algorithm, where the detection matrix is designed via the ZF technique. Finally, simulation results show that the proposed schemes obtain a better performance in terms of spectral efficiency and EE than the conventional schemes.

    DOI: 10.1109/TCOMM.2019.2942308

  • Bit error rate analysis of mrc precoded massive MIMO-OFDM systems with peak cancellation

    Tomoya Kageyama, Osamu Muta

    90th IEEE Vehicular Technology Conference, VTC 2019 Fall 2019 IEEE 90th Vehicular Technology Conference, VTC 2019 Fall - Proceedings   2019.9

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    In orthogonal frequency division multiplexing (OFDM) with massive multi-input multiple-output (mMIMO), the reduction of the high peak-to-average power ratio (PAPR) is a challenging problem. Recently, an adaptive peak cancellation is proposed to reduce the transmitted signalâ™s PAPR, while keeping the out-of-band leakage power (ACLR) as well as an in-band distortion power (EVM) below the predetermined and permissible value. In this paper, we propose an analytical method to evaluate achievable BER performance of downlink OFDM with the peak cancellation in massive multi-input-multioutput (mMIMO) systems using arbitrary numbers of transmit antennas and served users. In this method, bit error rate (BER) is derived based on the assumption that in-band distortion due to peak cancellation is approximated as random variable following Gaussian distribution, provided that variance of the Gaussian distribution in two user case is known. The results clarify that theoretical BER expressions for arbitrary numbers of transmit antennas and served users show good agreements with its simulation results. In addition, we clarified the impact of the increase of the number of transmit antennas on achievable BER and PAPR reduction capability in MRC precoded mMIMOOFDM system with the peak cancellation.

    DOI: 10.1109/VTCFall.2019.8891444

  • Two-dimensional pilot allocation for massive MIMO/TDD systems

    Osamu Muta, Kouki Matsuzaki, Haris Gacanin

    90th IEEE Vehicular Technology Conference, VTC 2019 Fall 2019 IEEE 90th Vehicular Technology Conference, VTC 2019 Fall - Proceedings   2019.9

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    In this paper, we propose a two-dimensional pilot allocation scheme over frequency- and delay-time domains (2D-PFD) for channel estimation in massive multiple-input multiple-output (MIMO)/time division duplex (TDD) system, where two- dimensional pilot resources are simultaneously allocated to each user for their uplink channel estimation. We evaluate bit error rate (BER) performance of massive MIMO/TDD system using the 2D-PFD scheme by computer simulation in order to clarify the effectiveness of the proposed pilot allocation compared with single dimensional pilot allocation over either delay-time domain or frequency domain, respectively.

    DOI: 10.1109/VTCFall.2019.8891106

  • Pilot-assisted sparse channel estimation based on mutual incoherence property

    Ahmed Nasser, Osamu Muta, Maha Elsabrouty

    90th IEEE Vehicular Technology Conference, VTC 2019 Fall 2019 IEEE 90th Vehicular Technology Conference, VTC 2019 Fall - Proceedings   2019.9

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    Properly designing scattered pilot pattern over orthogonal frequency division multiplexing (OFDM) subcarriers is important to improve the accuracy of the sparse channel estimation, while decreasing the number of the required pilots. In this paper, we propose a pilot-subcarrier allocation scheme that optimizes the pilot subcarrier patterns without any knowledge of channels, where channel estimation is done by interpolating the pilot- subcarriers scattered over frequency domain. The proposed pilot allocation scheme utilizes the mutual incoherence property (MIP) of the compressive sensing (CS) theory to formulate the pilot allocation problem into infinity norm problem. Then, MIP based weighted fast iterative shrinkage-thresholding algorithm (MIP-WFISTA) is proposed to solve the formulated problem. Simulation results validate that, compared with the conventional techniques, the proposed pilot design scheme achieves more accurate channel estimation and as a result better bit error rate (BER) performance while decreasing the number of the required pilots in frequency-selective fading environments.

    DOI: 10.1109/VTCFall.2019.8891578

  • Non-zero-sum game-based trust model to enhance wireless sensor networks security for IoT applications Reviewed

    Mohamed S. Abdalzaher, Lotfy Samy, Osamu Muta

    IET Wireless Sensor Systems   9 ( 4 )   218 - 226   2019.8

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    Nowadays, trust models of wireless sensor networks (WSNs) security have flourished due to the day-to-day attack challenges, which are most popular for internet of things (IoT). This article proposes a trust model based on non-zero-sum game approach for clustered-WSNs (CWSNs) security to maximise the data trustworthiness transmission. The proposed model is developed for two different attack-defence scenarios. In the first scenario, the trust model is used to face a denial-of-service (DoS) attack in which the attacker is able to drop or partially drop the delivered acknowledgments (ACKs) from a cluster member (CM) to the cluster head (CH). In the second scenario, the model target is to protect CWSNs from ON–OFF attack where the attacker is capable to frequently infect the CMs. Simulation results show improved performance of protecting the CWSNs against DoS/ON–OFF attacks and maximising data trustworthiness represented by the CMs compliance of sending the ACKs to the CH. Consequently, this mechanism can attain the appropriate security and performance for WSN-based IoT systems.

    DOI: 10.1049/iet-wss.2018.5114

  • Performance analysis of power control based interference coordination for downlink MIMO HetNets

    Ahmed Nasser, Osamu Muta

    2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019 Proceedings - 2019 IEEE VTS Asia Pacific Wireless Communications Symposium, APWCS 2019   2019.8

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    This paper presents performance analysis of power control (PC) based interference coordination for multiple-input multiple-output (MIMO) heterogeneous networks (HetNets). In this analysis, a PC-based approach is compared with a beamforming (BF) based approach to verify its advantages and limitation in managing a sort of interference in HetNets. As for the PC based approach, a non-cooperative game based PC scheme (NC-PC) is employed to coordinate co-tier and cross-tier interference, where the macro base station (MBS) and the small BS (SBS) are simultaneously competing to determine their transmit powers with equal priority for maximizing their sum rates. On the other hand, in the beamforming based scheme, interference cancellation is achieved by utilizing extra degree of freedom at MIMO technology, while multiple antennas are not necessary in the PC based technique. The performance of the NC-PC against MBS cancellation technique is evaluated with and without cotier interference cancellation scheme in terms of sum rate, the number of antennas, and diversity gain.

    DOI: 10.1109/VTS-APWCS.2019.8851666

  • Cross-tier interference management scheme for downlink mMIMIO-NOMA hetnet

    Ahmed Nasser, Osamu Muta, Maha Elsabrouty

    89th IEEE Vehicular Technology Conference, VTC Spring 2019 2019 IEEE 89th Vehicular Technology Conference, VTC Spring 2019 - Proceedings   2019.4

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    In this paper, a cross-tier interference mitigation framework based on interference alignment and coordinated beamforming (IA-CB) is investigated for downlink non-orthogonal multiple access (NOMA) heterogeneous networks (HetNets). In the proposed technique, named cross-tier IA-CB (CrIA-CB), the conventional IA-CB is extended to eliminate the cross-tier interference between the macro cell (MC) and the underlaid small cells (SC) in HetNets. The proposed CrIA-CB utilizes the degrees of freedom provided by the massive multiple input multiple output (mMIMO) technology for designing the transmit and receive beamforming vectors to null the cross-tier interference at the user side while decreasing the sharing channel state information (CSI) between SCs and MC. Simulation results validate the performance improvement of the proposed technique in terms of system sum rate over the conventional techniques.

    DOI: 10.1109/VTCSpring.2019.8746524

  • Effect of Limiter Based PAPR Reduction for Massive MIMO Systems

    Tomova Kageyama, Osamu Muta, Cheng Ming Chen, Sofie Pollin

    2018 Japan-Africa Conference on Electronics, Communications, and Computations, JAC-ECC 2018 2018 Proceedings of the Japan-Africa Conference on Electronics, Communications, and Computations, JAC-ECC 2018   43 - 46   2019.4

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    In massive multi-input multi-output (mMIMO) orthogonal frequency division multiplexing (OFDM) systems, reduction of high peak-to-average power ratio (PAPR) is a challenging problem. Although deliberate amplitude peak limiting is a promising PAPR reduction approach, it causes un-desired nonlinear in-band distortion and out-of-band radiation. Thus, the joint use of a peak limiter and band-limitation filter such as clipping-and-filtering (CF) is required. The objective of this paper is to evaluate the effect of CF based PAPR reduction for mMIMO-OFDM systems, where a band-limitation filter is designed to limit out-of-band radiation due to clipping while mitigating peak amplitude regrowth due to filtering. We discuss the effect of utilizing extra degrees of freedom for compensating in-band distortion due to CF in mMIMO systems. Simulation results verified the effectiveness of the above approach in terms of instantaneous peak power, adjacent channel leakage power ratio (ACLR) and signal-to-distortion power ratio (SDR) in mMIMO-OFDM downlink.

    DOI: 10.1109/JEC-ECC.2018.8679567

  • Performance evaluation of an adaptive self-organizing frequency reuse approach for OFDMA downlink Reviewed

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel B. Abdel-Rahman, Haris Gacanin, Hiroshi Furukawa

    Wireless Networks   25 ( 2 )   507 - 519   2019.2

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    Orthogonal frequency division multiple access (OFDMA) is extensively utilized for the downlink of cellular systems such as long term evolution (LTE) and LTE advanced. In OFDMA cellular networks, orthogonal resource blocks can be used within each cell. However, the available resources are rare and so those resources have to be reused by adjacent cells in order to achieve high spectral efficiency. This leads to inter-cell interference (ICI). Thus, ICI coordination among neighboring cells is very important for the performance improvement of cellular systems. Fractional frequency reuse (FFR) has been widely adopted as an effective solution that improves the throughput performance of cell edge users. However, FFR does not account for the varying nature of the channel. Moreover, it exaggerates in caring about the cell edge users at the price of cell inner users. Therefore, effective frequency reuse approaches that consider the weak points of FFR should be considered. In this paper, we present an adaptive self-organizing frequency reuse approach that is based on dividing every cell into two regions, namely, cell-inner and cell-outer regions; and minimizing the total interference encountered by all users in every region. Unlike the traditional FFR schemes, the proposed approach adjusts itself to the varying nature of the wireless channel. Furthermore, we derive the optimal value of the inner radius at which the total throughput of the inner users of the home cell is as close as possible to the total throughput of its outer users. Simulation results show that the proposed adaptive approach has better total throughput of both home cell and all 19 cells than the counterparts of strict FFR, even when all cells are fully loaded, where other algorithms in the literature failed to outperform strict FFR. The improved throughput means that higher spectral efficiency can be achieved; i.e., the spectrum, which is the most precious resource in wireless communication, can be utilized efficiently. In addition, the proposed algorithm can provide significant power saving, that can reach 50% compared to strict FFR, while not penalizing the throughput performance.

    DOI: 10.1007/s11276-017-1571-5

  • Uplink pilot allocation for multi-cell massive MIMO systems Reviewed

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEICE Transactions on Communications   ( 2 )   373 - 380   2019.2

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    Pilot contamination due to pilot reuse in adjacent cells is a very serious problem in massive multi-input multiple-output (MIMO) systems. Therefore, proper pilot allocation is essential for improving system performance. In this paper, we formulate the pilot allocation optimization problem so as to maximize uplink sum rate of the system. To reduce the required complexity inherent in finding the optimum pilot allocation, we propose a low-complexity pilot allocation algorithm, where the formulated problem is decoupled into multiple subproblems; in each subproblem, the pilot allocation at a given cell is optimized while the pilot allocation in other cells id held fixed. This process is continued until the achievable sum rate converges. Through multiple iterations, the optimum pilot allocation is found. In addition, to improve users’ fairness, we formulate fairness-aware pilot allocation as maximization problem of sum of user’s logarithmic rate and solve the formulated problem using a similar algorithm. Simulation results show that the proposed algorithms match the good performance of the exhaustive search algorithm, meanwhile the users’ fairness is improved.

    DOI: 10.1587/transcom.2017EBP3312

  • Employing Game Theory and TDMA Protocol to Enhance Security and Manage Power Consumption in WSNs-Based Cognitive Radio Reviewed

    Mohamed S. Abdalzaher, Osamu Muta

    IEEE Access   7   132923 - 132936   2019.1

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    The rapid development of wireless sensor networks (WSNs) is a significant incentive to contribute to vulnerable applications such as cognitive radio (CR). This paper proposes a Stackelberg game approach to enhance the WSN-based CR security against the spectrum sensing data falsification (SSDF) attack and conserve the consequently lost power consumption. The attack aims to corrupt the spectrum decision by imposing interference power to the delivered reports from the sensor nodes (SNs) to the fusion center (FC) to make a protection level below a specific threshold. The proposed model utilizes the intelligent Stackelberg game features along with the matched filter (MF) to maximize the number of protected reports sent by the SNs to the FC leading to an accurate decision of the spectrum status. Furthermore, the TDMA protocol is utilized to resolve the complexity of employing MF for the spectrum detection to avoid the collision between the delivered reports. The proposed model aims to enhance the number of correctly received reports at the FC, and hence manage the lost energy of reports retransmission due to the malicious attack effect. Moreover, the model can conserve the lost power of the failed communication attempts due to the SSDF attack impact. Simulation results indicate the improved performance of the proposed protection model along with the MF over six different environments against the SSDF attack as compared to two defense schemes, namely, random and equal weight defense strategies.

    DOI: 10.1109/ACCESS.2019.2940699

  • Radio propagation characteristics-based spoofing attack prevention on wireless connected devices Reviewed

    Mihiro Sonoyama, Takatsugu Ono, Haruichi Kanaya, Osamu Muta, Smruti R. Sarangi, Koji Inoue

    Journal of information processing   27   322 - 334   2019.1

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    A spoofing attack is a critical issue in wireless communication in which a malicious transmitter outside a system attempts to be genuine. As a countermeasure against this, we propose a device-authentication method based on position identification using radio-propagation characteristics (RPCs). Not depending on information processing such as encryption technology, this method can be applied to sensing devices etc. which commonly have many resource restrictions. We call the space from which attacks achieve success as the “attack space.” In order to confine the attack space inside of the target system to prevent spoofing attacks from the outside, formulation of the relationship between combinations of transceivers and the attack space is necessary. In this research, we consider two RPCs, the received signal strength ratio (RSSR) and the time difference of arrival (TDoA), and construct the attack-space model which uses these RPCs simultaneously. We take a tire pressure monitoring system (TPMS) as a case study of this method and execute a security evaluation based on radio-wave-propagation simulation. The simulation results assuming multiple noise environments all indicate that it is possible to eliminate the attack possibility from a distant location.

    DOI: 10.2197/ipsjjip.27.322

  • FDD Cooperative Channel Estimation and Feedback for 3D Massive MIMO System Reviewed

    Ahmed Nasser, Maha Elsabrouty, Osamu Muta

    IEEE Access   7   76283 - 76294   2019.1

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    In this paper, a downlink cooperative channel estimation scheme is proposed for the three-dimensional massive multiple inputs multiple outputs (3D-mMIMO) system operating in the frequency division duplexing (FDD) mode. In the proposed cooperative scheme, users have to cooperate with each other via device-to-device (D2D) communication protocol to jointly exploit the sparsity structure property of the channel. Motivated by the sparsity property of the mMIMO channel in the angle-time domain, a parametric feedback scheme is proposed, where the feedback overhead is decreased by sending a limited version of the estimated coefficients rather than all the coefficients back to the BS. Then, a compressive sensing (CS) algorithm is proposed, which we named weighted fast iterative shrinkage thresholding (WFISTA). In the WFISTA, we first introduce new weights and threshold function to the original FISTA to enhance its sparsity-undersampling trade-off in the single measurement vector (SMV) case, then we extend the proposed WFISTA to the case of multiple measurement vector (MMV) problem by adopting ReMBo (reduce MMV and boost) strategy. The proposed WFISTA has the ability to estimate the mMIMO system's channel coefficients by exploiting the joint sparsity structure through cooperation among users' equipment (UEs). Complexity analysis and the probability of decreasing the feedback overhead are provided for the proposed cooperative estimation scheme. The simulation results verify the efficiency of the proposed cooperative algorithm scheme compared to several joint channel estimations.

    DOI: 10.1109/ACCESS.2019.2920861

  • Enhanced selected mapping for impulsive noise blanking in multi-carrier power-line communication systems Reviewed

    Tomoya Kageyama, Osamu Muta, Haris Gacanin

    IEICE Transactions on Communications   E102B ( 11 )   2174 - 2182   2019.1

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    In this paper, we propose an enhanced selected mapping (e-SLM) technique to improve the performance of OFDM-PLC systems under impulsive noise. At the transmitter, the best transmit sequence is selected from among possible candidates so as to minimize the weighted sum of transmit signal peak power and the estimated receive one, where the received signal peak power is estimated at the transmitter using channel state information (CSI). At the receiver, a nonlinear blanking is applied to hold the impulsive noise under a given threshold, where impulsive noise detection accuracy is improved by the proposed e-SLM. We evaluate the probability of false alarms raised by impulsive noise detection and bit error rate (BER) of OFDM-PLC system using the proposed e-SLM. The results show the effectiveness of the proposed method in OFDM-PLC system compared with the conventional blanking technique.

    DOI: 10.1587/transcom.2019EBP3081

  • Pilot Allocation and Interference Coordination for Heterogeneous Network with Massive MIMO/TDD

    Osamu Muta, Wanming Hao, Haris Gacanin

    2018 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2018 ISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems   295 - 300   2018.11

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    In this paper, we present our recent studies on pilot allocation and interference coordination for heterogeneous networks (HetNets) using massive multi-input-multi-output (mMIMO) technology in time division duplex (TDD) mode, where the macro-cell base station (MBS) and overlaid small-cell base stations (SBSs) share the same time-frequency resources, and thus co-tier and cross-tier interferences occur. We investigate how to coordinate such undesirable interference for maximizing the system sum-rate under required constraints. As the first approach, we present an uplink pilot allocation scheme to enhance the downlink system sum-rate by coordinating downlink cross-tier interference to small-cell users (SUs) based on the estimated uplink channel state information. In this approach, we study the optimum pilot allocation against the trade-off between two degradation factors, i.e., uplink pilot overhead and downlink cross-tier interference. As the second approach, we present a dynamic SBS clustering scheme to mitigate dominant co-tier interference among small cells (SCs), where the SBS clustering is carried out based on potential mutual co-tier interference strength between two SCs. We also consider the SBS precoder design in each cluster to further improve the downlink sum rate of SCs under SBS power constraint. Simulation results show that our proposals are useful approaches to enhance the sum rate performance in TDD-mMIMO-HetNets.

    DOI: 10.1109/ISPACS.2018.8923182

  • Performance Analysis of Impulsive Noise Blanking for Multi-Carrier PLC Systems Reviewed International journal

    Tomoya Kageyama, Osamu Muta

    IEICE Communications Express   2018.9

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    Tomoya Kageyama, Osamu Muta, ``Performance Analysis of Impulsive Noise Blanking for Multi-Carrier PLC Systems,'' IEICE Communications Express, Vol.7, no.9, pp.334-349, Sept. 2018.

  • Queue-Aware Opportunistic Interference Alignment in Downlink MU-MIMO Cellular Systems Reviewed

    A. M. Benaya, Maha Elsabrouty, Osamu Muta

    IEEE Access   6   50860 - 50874   2018.9

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    Recently, attention has been paid to the integration of opportunistic communications, whether based on opportunistic user selection (OUS) or opportunistic antenna selection, with interference alignment (IA) in order to improve the performance of wireless networks. In OUS, users that have the best operational conditions are usually selected. However, fairness among users is another important aspect that should be considered in scheduling users. In this paper, a queue-aware two-stage opportunistic IA (OIA) algorithm is proposed for the downlink multicell multiuser multiple-input-multiple-output system. In the first stage, inter-cell interference is eliminated using one pair of precoding/postcoding matrices. Whereas in the second stage, two user selection polices are proposed namely, capacity-based selection (CBS) and queue-based scheduling (QBS), to select a group of users and minimize the inter-user interference among them using another pair of precoding/postcoding matrices. In the QBS-OIA case, a joint scheduling, resource allocation, and IA optimization problems are formulated, and a low complexity heuristic is proposed to solve it. Comparisons are conducted with other OIA algorithms in terms of achieved sum rate, achieved degrees-of-freedom (DoFs), number of served users, queue overflow probability, and computational complexity. Simulations show that the two proposed CBS-OIA and QBS-OIA algorithms outperform other schemes in terms of sum rate and DoFs. Moreover, the proposed QBS-OIA is capable of serving more users, in some cases, and achieves lower overflow probability with much reduced complexity on the expense of achieving a bit lower sum rate than the CBS-OIA in some cases.

    DOI: 10.1109/ACCESS.2018.2869693

  • Alternative direction for 3D orthogonal frequency division multiplexing massive MIMO FDD channel estimation and feedback Reviewed

    Ahmed Nasser, Maha Elsabrouty, Osamu Muta

    IET Communications   12 ( 11 )   1380 - 1388   2018.7

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    In this study, downlink channel estimation of three-dimensional massive multiple-input multiple-output (3D-MIMO) system operating in the frequency division duplexing (FDD) mode is considered. Inspired by the channel sparsity property, this study proposes a compressive sensing algorithm to exploit the channel sparsity structure in the angle-time domain. The proposed algorithm, named AMP-ADM, combines the multiple approximate message passing (M-AMP) algorithm with the alternative direction of multiplier (ADM) technique to efficiently exploit the sparsity structure of the 3D massive MIMO channel. First, the proposed AMP-ADM is implemented in the case of the conventional estimation for the FDD protocol where the channel is estimated individually at each user equipment. Then, building on this algorithm, a low complexity feedback AMPADM- T scheme at the transmitting base station (BS) side is proposed. In the proposed feedback AMP-ADM-T technique the users' channels are jointly estimated at the BS to fully exploit the common sparsity basis. Complexity and convergence analyses are provided for both the AMP-ADM and feedback AMP-ADM-T algorithms. Simulation results prove the improved performance of the proposed feedback AMP-ADM-T algorithm compared to different state-of-the-art joint channel estimation techniques.

    DOI: 10.1049/iet-com.2017.0916

  • Pilot Allocation for Interference Coordination in Two-Tier Massive MIMO Heterogeneous Network

    Wanming Hao, Osamu Muta, Harris Gacanin

    87th IEEE Vehicular Technology Conference, VTC Spring 2018 2018 IEEE 87th Vehicular Technology Conference, VTC Spring 2018 - Proceedings   1 - 6   2018.7

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    In this paper, we investigate pilot allocation problem in two-tier time division duplex (TDD) heterogeneous network (HetNet) with mMIMO. First, we propose a new pilot allocation scheme to maximize ergodic downlink sum rate of macro users (MUs) and small cell users (SUs), where the uplink pilot overhead and cross-tier interference are jointly considered. Then, we theoretically analyze the formulated problem and propose a low complexity one-dimensional search algorithm to obtain the optimum pilot allocation. In addition, we propose two suboptimal pilot allocation algorithms to simplify the computational process and improve SUs' fairness, respectively. Finally, simulation results show that the performance of the proposed scheme outperforms that of the traditional schemes.

    DOI: 10.1109/VTCSpring.2018.8417620

  • An enhanced selected mapping technique for joint PAPR reduction and impulsive noise suppression in multi-carrier powerline communications systems

    Tomoya Kageyama, Osamu Muta, Haris Gacanin

    2018 IEEE International Symposium on Power Line Communications and its Applications, ISPLC 2018 2018 IEEE International Symposium on Power Line Communications and its Applications, ISPLC 2018   2018.5

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    In power line communication (PLC) systems using multi-carrier modulation such as orthogonal frequency division multiplexing (OFDM), reduction of peak-to-average power ratio (PAPR) of OFDM signal and mitigation of the influence of impulsive noise are challenging problems. To deal with these problems in PLC-OFDM systems, this paper proposes an enhanced selected mapping (e-SLM) technique that jointly achieves PAPR reduction on the transmitter side and impulsive noise detection accuracy improvement on the receiver side, where the transmitter selects the best transmit sequence among possible candidates so as to minimize the weighted sum of transmit signal peak power and the estimated receive one, provided that channel state information is available on the transmitter side. On the receiver side, a nonlinear filter is applied to suppress impulsive noise, where the received signal amplitudes exceeding a given threshold are blanked as impulsive noise. Using the proposed e-SLM, peak power of the received signal is reduced below a given threshold level, so that impulsive noise is effectively detected with high accuracy. We evaluate bit error rate (BER) performance of PLC-OFDM systems using the proposed e-SLM method under PLC channel in presence of impulsive noise. Simulation results show the effectiveness of the proposed method in OFDM PLC systems.

    DOI: 10.1109/ISPLC.2018.8360223

  • Dynamic autonomous frequency reuse for uplink cellular networks

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta

    2018 IEEE International Conference on Consumer Electronics, ICCE 2018 2018 IEEE International Conference on Consumer Electronics, ICCE 2018   1 - 5   2018.3

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    In this paper, a dynamic autonomous frequency reuse strategy is adopted for resource allocation in uplink cellular networks. It is assumed that each cell is divided into inner and outer regions. The proposed approach is based on minimizing the total uplink interference at every eNB for all users in both the inner and outer regions in the network. The main advantage of the proposed scheme is that it adapts itself to the varying wireless channel. Simulation results show that the proposed approach provides better total network uplink throughput and average user uplink bit rate compared to the traditional fractional frequency reuse (FFR) regardless of the User Equipment (UE) transmit power, cell radius and user density within the cell.

    DOI: 10.1109/ICCE.2018.8326341

  • Wireless Spoofing-Attack Prevention Using Radio-Propagation Characteristics

    Mihiro Sonoyama, Takatsugu Ono, Osamu Muta, Haruichi Kanaya, Inoue Koji

    15th IEEE International Conference on Dependable, Autonomic and Secure Computing, 2017 IEEE 15th International Conference on Pervasive Intelligence and Computing, 2017 IEEE 3rd International Conference on Big Data Intelligence and Computing and 2017 IEEE Cyber Science and Technology Congress, DASC-PICom-DataCom-CyberSciTec 2017 Proceedings - 2017 IEEE 15th International Conference on Dependable, Autonomic and Secure Computing, 2017 IEEE 15th International Conference on Pervasive Intelligence and Computing, 2017 IEEE 3rd International Conference on Big Data Intelligence and Computing and 2017 IEEE Cyber Science and Technology Congress, DASC-PICom-DataCom-CyberSciTec 2017   502 - 510   2018.3

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    A spoofing attack is a critical issue in wireless communication in embedded systems in which a malicious transmitter outside a system attempts to be genuine. As a countermeasure against this, we propose a device-authentication method based on position identification using radio-propagation characteristics (RPCs). Since RPCs are natural phenomena, this method does not depend on information processing such as encryption technology. We call the space from which attacks achieve success "attack space". By formulating the relationship between combinations of transceivers and the attack space, this method can be used in embedded systems. In this research, we consider two RPCs, the received signal strength ratio (RSSR) and the time difference of arrival (TDoA), and construct the attack-space model which use these RPCs simultaneously for preventing wireless spoofing-attacks. We explain the results of a validity evaluation for the proposed model based on radio-wave-propagation simulation assuming free space and a noisy environment.

    DOI: 10.1109/DASC-PICom-DataCom-CyberSciTec.2017.94

  • Game Theoretic Approaches for Cooperative Spectrum Sensing in Energy-Harvesting Cognitive Radio Networks Reviewed

    Osama Elnahas, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    IEEE Access   6   11086 - 11100   2018.2

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    In this paper, we propose game-theoretic approaches to model the cooperative spectrum sensing in cognitive radio environment with cognitive secondary users (SU) capable of energy harvesting. An evolutionary game model is considered in the first scenario, where distributed SUs are allowed to choose between two strategies, cooperate to sense the spectrum, or deny to be a free rider. The sensed data is sent to a fusion center (FC) to have a final decision about the existence of the primary user. In the second scenario, the Stackelberg game is applied to model the case when the FC participates as a leader in the game, with carefully designed incentives to SUs to encourage cooperation. Simulation results show the behavior of the two proposed game models and quantify the improvement due to the FC intervention in the Stackelberg game model.

    DOI: 10.1109/ACCESS.2018.2810107

  • Weighted fast iterative shrinkage thresholding for 3D massive MIMO channel estimation

    Ahmed Nasser, Maha Elsabrouty, Osamu Muta

    28th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2017 2017 IEEE International Symposium on Personal, Indoor and Mobile Radio Communications Engaged Citizens and their New Smart Worlds, PIMRC 2017 - Conference Proceedings   1 - 5   2018.2

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    Fitting the huge number of pilots needed for massive multiple inputs multiple outputs antennas (MIMO) channel estimation within the time and frequency resources is a challenging problem. Generally, compressed sensing (CS) channel estimation algorithms face the dilemma of trading off the estimation accuracy and the computational complexity. In this paper, we propose a weighted fast iterative shrinkage thresholding algorithm (W-FISTA). The proposed algorithm provides higher estimation efficiency with the same complexity as the original FISTA. With low computational complexity, multiple measurement vectors (MMV) version of the W-FISTA is proposed to estimate the 3D massive MIMO channel. The proposed MMV-WFISTA estimate the channel coefficients by exploiting its joint sparsity structure in the angle-delay sparse domain. The complexity analysis and the simulation results indicate a clear improvement in the performance of the proposed MMV-WFISTA over joint estimation algorithms.

    DOI: 10.1109/PIMRC.2017.8292556

  • Power Allocation for Massive MIMO Cognitive Radio Networks with Pilot Sharing under SINR Requirements of Primary Users Reviewed

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEEE Transactions on Vehicular Technology   67 ( 2 )   1174 - 1186   2018.2

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    In this paper, we investigate the power allocation problem in massive multiple-input-multiple-output cognitive radio networks. We propose an orthogonal pilot sharing scheme at pilot transmission phase, where secondary users are allowed to use pilots for channel estimation only when there are temporarily unused orthogonal pilots. Following this, we formulate the power allocation optimization problem of the secondary network (SN) to maximize the downlink sum rate of the SN subject to the total transmit power and primary users' signal-interference-plus-noise-ratio constraints. Next, we transform the original (nonconvex) problem into a convex one by using convex approximation techniques and propose an iterative algorithm to obtain the solution. Furthermore, we prove that the proposed algorithm converges to Karush-Kuhn-Tucker points of the original problem. Meanwhile, the impact of the number of the secondary base station (SBS) antennas or the primary BS (PBS) antennas on the downlink rate of the SN and primary network is theoretically studied. Finally, the numerical results present the downlink sum rate of the SN under different parameters through our proposed algorithm.

    DOI: 10.1109/TVT.2017.2749599

  • Pilot allocation for multi-cell TDD massive MIMO systems

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    86th IEEE Vehicular Technology Conference, VTC Fall 2017 2017 IEEE 86th Vehicular Technology Conference, VTC Fall 2017 - Proceedings   1 - 5   2018.2

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    Pilot contamination due to the pilot reuse in adjacent cells is a serious problem in time-division duplex (TDD) massive multi-input multiple-output (MIMO) system. Therefore, the pilot allocation is significant for improving the performance of the system. In this paper, we formulate the pilot allocation optimization problem for maximizing uplink sum rate of the system. To reduce the required complexity for finding the optimum pilot allocation, we propose a low-complexity pilot allocation algorithm, where the formulated problem is decoupled into multiple subproblems; in each subproblem, the pilot allocation at a given cell is optimized while fixing the pilot allocation in other cells. This process is continued until the achievable sum rate converges. Through multiple iterations, the optimum pilot allocation is found. In addition, to improve users' fairness, we formulate a fairness aware pilot allocation as maximization problem of sum of user's logarithmic rate and solve the formulated problem using a similar algorithm. Simulation results show that the proposed algorithms obtain good performance comparable to the exhaustive search algorithm, meanwhile the users' fairness is improved.

    DOI: 10.1109/VTCFall.2017.8288098

  • Performance analysis on uplink pilot allocation in TDD Massive MIMO heterogeneous networks Reviewed

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E100A ( 11 )   2314 - 2322   2017.11

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    Massive MIMO (mMIMO) is a promising technology for smart multimedia and wireless communication fields. In this paper, we investigate pilot allocation problem in two-tier time division duplex (TDD) heterogeneous network (HetNet) with mMIMO. First, we propose a new pilot allocation scheme for maximizing ergodic downlink sum rate of macro users (MUs) and small cell users (SUs), where the uplink pilot overhead and cross-tier interference are jointly considered. Then, we theoretically analyze the formulated problem and propose a low complexity onedimensional search algorithm to obtain the optimum pilot allocation. In addition, we propose two suboptimal pilot allocation algorithms to simplify the computational process and improve SUs' fairness, respectively. Finally, simulation results show that the performance of the proposed scheme outperforms that of the traditional schemes.

    DOI: 10.1587/transfun.E100.A.2314

  • Partial Scrambling Selected Mapping for PAPR Reduction of OFDM Signals Reviewed International journal

    Osamu Muta, Yusuke Ohki, and Tomoya Kageyama

    IEICE Communications Express   2017.9

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    Osamu Muta, Yusuke Ohki, and Tomoya Kageyama, ``Partial Scrambling Selected Mapping for PAPR Reduction of OFDM Signals,'' IEICE Communications Express, Vol. 6 No. 9, pp.535-541, Sept. 2017.

  • Using repeated game for maximizing high priority data trustworthiness in Wireless Sensor Networks

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta

    2017 IEEE Symposium on Computers and Communications, ISCC 2017 2017 IEEE Symposium on Computers and Communications, ISCC 2017   552 - 557   2017.9

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    Due to the fast boom of security threats in wireless sensor networks (WSNs) sensitive applications, we propose a game-theoretic protection approach for sensor nodes in a clustered WSN based on a repeated game. The proposed game model is developed for detecting malicious sensor nodes that drop the high priority packets (HPPs) aiming at maximizing the high priority data trustworthiness (HPT). Simulation results indicate the improved HPT of the proposed protection model which attains the Pareto optimal HPT as compared to a non-cooperative defense mechanism.

    DOI: 10.1109/ISCC.2017.8024586

  • An effective Stackelberg game for high-assurance of data trustworthiness in WSNs

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta

    2017 IEEE Symposium on Computers and Communications, ISCC 2017 2017 IEEE Symposium on Computers and Communications, ISCC 2017   1257 - 1262   2017.9

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    Wireless Sensor Networks (WSNs) security plays an intrinsic role to guarantee efficient data transmission, stable network topologies, and robust routing algorithms. In this paper, we propose a modified Stackelberg game of a previous work for high assurance of data trustworthiness in a Power Grid Network (PGN). The proposed approach is presented to mitigate a more severe attack scenario compared to that considered in the previous work; this attack scenario frequently manipulates sets of the deployed nodes in the PGN, which cannot be treated using the previously proposed approach. Our proposed scheme reduces the required number of nodes to be protected to achieve the desired data trustworthiness. Simulation results prove efficient detection for corrupted transmitted data based on limited number of nodes as compared to the previously proposed approach.

    DOI: 10.1109/ISCC.2017.8024697

  • WLAN Channel Assignment Based on Minimizing the Worst-Case Interference Reviewed

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel B. Abdel-Rahman, Haris Gacanin, Hiroshi Furukawa

    Wireless Personal Communications   95 ( 4 )   4867 - 4881   2017.8

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    An optimization model for solving the channel assignment problem in multi-cell WLANs which is based on minimizing the maximum interference at access points in the network is proposed. The channel assignment problem is formulated as a mixed integer linear program. The main advantage of the proposed model is that it guarantees that the worst access point interference is minimized. Simulation results show that the proposed model provides both the least worst access point interference and the best fairness, compared to the pick-first greedy algorithm, the optimum model and the maxmin model.

    DOI: 10.1007/s11277-017-4129-z

  • Energy-efficient interference mitigation with hierarchical partial coordination for MIMO heterogeneous networks Reviewed

    Thanh Tung Vu, Ha Hoang Kha, Osamu Muta, Mohamed Rihan

    IEICE Transactions on Communications   E100B ( 6 )   1023 - 1030   2017.6

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    In heterogenous networks (HetNets), the deployment of small cells with the reuse of limited frequency resources to improve the spectral efficiency results in cross- and co-tier interference. In addition, the excessive power usage in such networks is also a critical problem. In this paper, we propose precoding and postcoding schemes to tackle interference and energy efficiency (EE) challenges in the two-tier downlink multiple- input-multiple-output (MIMO) HetNets. We propose transmission strate- gies based on hierarchical partial coordination (HPC) of the macro cell and small cells to reduce channel state information (CSI) exchange and guaran- tee the quality of service (QoS) in the upper tier with any change of network deployment in the lower tier. We employ the interference alignment (IA) scheme to cancel cross- and co-tier interference. Additionally, to maximize the EE, power allocation schemes in each tier are proposed based on a combination of Dinkelbach's method and the bisection searching approach. To investigate insights on the optimization problem, a theoretical analysis on the relationship between the maximum achievable EE and the transmit power is derived. Simulation results prove the superior EE performance of the proposed EE maximization scheme over the sum rate maximization approach and confirm the validity of our theoretical findings.

    DOI: 10.1587/transcom.2016EBP3247

  • Using Stackelberg game to enhance cognitive radio sensor networks security Reviewed

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta

    IET Communications   11 ( 9 )   1503 - 1511   2017.6

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    The authors propose a game-theoretic approach using the Stackelberg game for securing cognitive radio sensor network (CRSN) against the spectrum sensing data falsification attack; this attack aims at corrupting the spectrum decisions communicated from the ambient sensor nodes (ASNs) to the fusion centre by imposing interference power. The proposed game approach is developed for two different attack-defence scenarios. In the first scenario, the attacker selects to attack a group of delivered reports of the ASNs that have a protection degree below a specific threshold. In the second scenario, the attacker applies its maximum attack interference power to the delivered reports of the ASNs that have been reported to be least protected in the previous round. Simulation results indicate the improved performance of the proposed protection model as compared with two baseline defence mechanisms, namely, the random and equal-protection defence mechanisms with static signal-to-noise ratio (SNR) and variable SNRs. Consequently, Stackelberg game features prove to be beneficial for securing communication over CRSN.

    DOI: 10.1049/iet-com.2016.1336

  • Price-based Pilot Sharing for Spectrum Sharing Massive MIMO Networks Reviewed International journal

    Wanming Hao, Osamu Muta, Haris Gacanin, and Hiroshi Furukawa

    IEICE Communication Express   2017.5

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    Wanming Hao, Osamu Muta, Haris Gacanin, and Hiroshi Furukawa, ``Price-based Pilot Sharing for Spectrum Sharing Massive MIMO Networks,'' IEICE Communication Express, Vol. 6, No. 5, pp.213-218, May 2017

  • Energy-efficient resource allocation for cooperative cognitive radio networks with imperfect spectrum sensing

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    5th International Conference on Network, Communication and Computing, ICNCC 2016 Proceedings of 2016 5th International Conference on Network, Communication and Computing, ICNCC 2016   257 - 261   2016.12

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    Energy-efficient resource allocation is considered for cognitive cooperative radio networks (CCRNs) with imperfect spectrum sensing. The optimization problem of maximizing energy efficiency (EE) is formulated over the transmission power and sensing time subject to some practical limitations, such as the individual power constraint for secondary source and relay, the quality of service (QoS) for the secondary system, and effective protection for the primary user (PU). Given the complexity of this problem, two simplified versions (i.e., perfect and imperfect sensing cases) are studied in this paper. We transform the considered problem in fractional form into an equivalent optimization problem in subtractive form. Then, for perfect sensing, the Lagrange dual decomposition and iterative algorithm are applied to acquire the optimal power allocation policy; for imperfect sensing, an exhaustive search and iterative algorithm are proposed to obtain the optimal sensing time and corresponding power allocation. Finally, numerical results show that the EE design greatly improves EE compared with the conventional spectrum-efficient design.

    DOI: 10.1145/3033288.3033324

  • A Dynamic Distributed Frequency Reuse Scheme for OFDMA Downlink Cellular Networks Reviewed International journal

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, Haris Gacanin, and Hiroshi Furukawa

    IEICE Communications Express   2016.8

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    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, Haris Gacanin, and Hiroshi Furukawa, ``A Dynamic Distributed Frequency Reuse Scheme for OFDMA Downlink Cellular Networks,'' IEICE Communications Express, vol. 5, no. 8, pp.248-253, Aug. 2016.

  • Energy-efficient resource allocation in sensing-based spectrum sharing for cooperative cognitive radio networks Reviewed

    Wanming Hao, Shouyi Yang, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEICE Transactions on Communications   E99B ( 8 )   1763 - 1771   2016.8

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    Energy-efficient resource allocation is considered in sensing-based spectrum sharing for cooperative cognitive radio networks (CCRNs). The secondary user first listens to the spectrum allocated to the primary user (PU) to detect the PU state and then initiates data transmission with two power levels based on the sensing decision (e.g., idle or busy). Under this model, the optimization problem of maximizing energy efficiency (EE) is formulated over the transmission power and sensing time subject to some practical limitations, such as the individual power constraint for secondary source and relay, the quality of service (QoS) for the secondary system, and effective protection for the PU. Given the complexity of this problem, two simplified versions (i.e., perfect and imperfect sensing cases) are studied in this paper. We transform the considered problem in fractional form into an equivalent optimization problem in subtractive form. Then, for perfect sensing, the Lagrange dual decomposition and iterative algorithm are applied to acquire the optimal power allocation policy; for imperfect sensing, an exhaustive search and iterative algorithm are proposed to obtain the optimal sensing time and corresponding power allocation strategy. Finally, numerical results show that the energy-efficient design greatly improves EE compared with the conventional spectrum-efficient design.

    DOI: 10.1587/transcom.2015CCP0026

  • Model-based quantization for perceptually weighted compressed video sensing Reviewed International journal

    S. Elsayed, M. Elsabrouty, O. Muta and H. Furukawa

    IEICE Communications Express   2016.6

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    S. Elsayed, M. Elsabrouty, O. Muta and H. Furukawa, “Model-based quantization for perceptually weighted compressed video sensing," IEICE Communications Express, Vol. 5 No. 7, pp.216-222, July 2016.

  • Game theory meets wireless sensor networks security requirements and threats mitigation A survey Reviewed

    Mohamed S. Abdalzaher, Karim Seddik, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa, Adel Abdel-Rahman

    Sensors (Switzerland)   16 ( 7 )   2016.6

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    We present a study of using game theory for protecting wireless sensor networks (WSNs) from selfish behavior or malicious nodes. Due to scalability, low complexity and disseminated nature of WSNs, malicious attacks can be modeled effectively using game theory. In this study, we survey the different game-theoretic defense strategies for WSNs. We present a taxonomy of the game theory approaches based on the nature of the attack, whether it is caused by an external attacker or it is the result of an internal node acting selfishly or maliciously. We also present a general trust model using game theory for decision making. We, finally, identify the significant role of evolutionary games for WSNs security against intelligent attacks; then, we list several prospect applications of game theory to enhance the data trustworthiness and node cooperation in different WSNs.

    DOI: 10.3390/s16071003

  • Distributed perceptual compressed sensing framework for multiview images Reviewed

    S. Elsayed, M. Elsabrouty, Osamu Muta, Hiroshi Furukawa

    Electronics Letters   52 ( 10 )   821 - 823   2016.5

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    A perceptual-based compressed sensing (CS), which focuses the measurements and the recovery on the visually important low-frequency coefficients, is applied for multi-view image signals. High correlation among different views is exploited to generate signal prediction using disparity estimation and compensation techniques. A residual-based recovery is utilised as a joint recovery for the nonreference images to enhance the reconstruction performance. The proposed framework shows remarkable performance improvement over the conventional CS with joint recovery as well as the perceptualbased CS with independent recovery.

    DOI: 10.1049/el.2016.0477

  • Reduced complexity K-best sphere decoding algorithms for ill-conditioned MIMO channels

    Ibrahim Al-Nahhal, Masoud Alghoniemy, Osamu Muta, Adel B.Abd El-Rahman

    13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016 2016 13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016   183 - 187   2016.3

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    The traditional K-best sphere decoder retains the best K-nodes at each level of the search tree; these K-nodes, include irrelevant nodes which increase the complexity without improving the performance. A variant of the K-best sphere decoding algorithm for ill-conditioned MIMO channels is proposed, namely, the ill-conditioned reduced complexity K-best algorithm (ill-RCKB). The ill-RCKB provides lower complexity than the traditional K-best algorithm without sacrificing its performance; this is achieved by discarding irrelevant nodes that have distance metrics greater than a pruned radius value, which depends on the channel condition number. A hybrid-RCKB decoder is also proposed in order to balance the performance and complexity in both well and ill-conditioned channels. Complexity analysis for the proposed algorithms is provided as well. Simulation results show that the ill-RCKB provides significant complexity reduction without compromising the performance.

    DOI: 10.1109/CCNC.2016.7444753

  • Using Stackelberg game to enhance node protection in WSNs

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta, Adel Abdelrahman

    13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016 2016 13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016   853 - 856   2016.3

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    In this paper, we propose a game-theoretic protection model for Wireless Sensor Network (WSN) nodes within a cluster based on a Stackelberg game. The proposed game approach is developed for two different attack-defense scenarios. In the first scenario, the attacker selects to attack a group of nodes that have a protection degree below a specific threshold. In the second scenario, the attacker targets the nodes that have been reported to be least protected in the previous round. Simulation results indicate the improved performance of the proposed protection model as compared to the no-defense case.

    DOI: 10.1109/CCNC.2016.7444900

  • Performance of perceptual 1-bit compressed sensing for audio compression

    Hossam M. Kasem, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    20th IEEE Symposium on Computers and Communication, ISCC 2015 20th IEEE Symposium on Computers and Communication, ISCC 2015   477 - 482   2016.2

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    The innovative concept of Compressed Sensing (CS) presents a breakthrough that enables the acquisition of sparse signals at much lower sampling rates compared to the conventional Nyquist rate. The scope of CS is not limited only to sparse signal but it is also applicable to compressible signals, such as multimedia signals including audio signals. Representing the random samples from CS process using finite-precision is a crucial problem in communication systems. In this paper, we focus on 1-bit quantized CS. We propose to take into account the perceptual CS model for audio compression, where the perceptual properties are taken into account. We propose two models, the first applies perceptual effect at the transmitter side. In the other model, a modified Binary Iterative Hard Thresholding (BIHT) is proposed to improve the performance of 1-bit compressed sensing by taking the perceptual properties of the received audio signal into account. The Mean Opinion Score (MOS) is used to compare the perceptual quality of the received signal for the proposed 1-bit perceptual CS algorithms. Simulation results show that a better performance is achieved using the proposed algorithms.

    DOI: 10.1109/ISCC.2015.7405560

  • An adaptive peak cancellation method for linear-precoded MIMO-OFDM signals

    Tomoya Kageyama, Osamu Muta, Haris Gacanin

    26th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2015 2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2015   2015-December   271 - 275   2015.12

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    Recently, an adaptive peak cancellation was proposed to reduce the high peak-to-average power ratio (PAPR), while keeping the out-of-band (OoB) power leakage as well as an in-band distortion power (EVM) below the pre-determined (permissible) level. However, the peak cancellation in MIMO-OFDM systems was not considered. In this paper, we propose a peak cancellation method for linearly pre-coded MIMO-OFDM systems using eigen-beam space division multiplexing (E-SDM). We evaluate and discuss the performance of the system using the proposed peak cancellation in terms of bit error rate (BER), complementary cum-mulative distribution function (CCDF) of PAPR and the system's computational complexity. Our results show the improvements with respect to both the achievable BER and PAPR with the proposed peak cancellation in E-SDM systems under the restriction of OoB power radiation.

    DOI: 10.1109/PIMRC.2015.7343308

  • Optimized quantization and scaling of layered LDPC scaled min-sum decoder

    Ahmed A. Emran, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    IEEE International Symposium on Information Theory, ISIT 2015 Proceedings - 2015 IEEE International Symposium on Information Theory, ISIT 2015   2668 - 2672   2015.9

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    In this paper, we apply an efficient scaling strategy on layered scaled min-sum LDPC decoder. In addition, we propose a joint optimization strategy for the quantization and scaling parameters of layered scaled min-sum LDPC decoder. The study of our optimization results, for DVB-S2 LDPC codes with different constellation sizes and code rates, shows that each constellation size code rate pair has different optimal scaling and quantization parameters. In order to maximize the achievable performance, we propose using the different scaling and quantization parameters for each constellation size code rate pair. The simulation results show the performance improvement of separately using optimal scaling parameters or optimal quantization parameters, and the overall performance enhancement of using both optimal scaling and quantization parameters.

    DOI: 10.1109/ISIT.2015.7282940

  • Perceptual-based Compressed Video Sensing Reviewed International journal

    Sawsan Elsayed, Maha Elsabrouty, Osamu Muta, and Hiroshi Furukawa

    IEICE Communications Express   2015.8

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    Sawsan Elsayed, Maha Elsabrouty, Osamu Muta, and Hiroshi Furukawa, ``Perceptual-based Compressed Video Sensing,'' IEICE Communications Express, Vol. 4 No. 8, pp.251-257, Aug. 2015.

  • ACK based partial random selection encoding for uplink distributed LDPC network codes Reviewed

    A. Emran, M. Elsabrouty, Osamu Muta, Hiroshi Furukawa

    Electronics Letters   51 ( 17 )   1328 - 1329   2015.8

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    An ACK based partial random selection (ACK-PRS) encoding algorithm for the uplink distributed low-density parity check network code of the generalised adaptive network coded cooperation is proposed. The proposed algorithm achieves good error correction performance and high system throughput, while maintaining the low complexity of the random selection algorithm. This good performance is achieved by a minor increase in the down link signalling. Simulation results for 5 and 20 uplink users verify the good performance of the proposed ACK-PRS.

    DOI: 10.1049/el.2015.2132

  • Effect of linearity enhancement in A/D conversion for single carrier transmission systems

    Osamu Muta, Daisuke Kanemoto, Syota Fukushige, Hiroshi Furukawa

    81st IEEE Vehicular Technology Conference, VTC Spring 2015 2015 IEEE 81st Vehicular Technology Conference, VTC Spring 2015 - Proceedings   2015.7

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    Analog-to-digital (A/D) converter (ADC) and related analog hardware designs are important factors to simplify the transceiver circuits in wireless communication systems. In order to mitigate the nonlinearity of a low-resolution ADC that reduces the required analog hardware complexity, we have investigated two nonlinearity mitigation techniques for A/D conversion, i.e., the dither-ADC and the hysteresis-ADC. In this paper, we evaluate the effect of the nonlinearity mitigated A/D conversion techniques on the achievable performance in single carrier offset- quadrature-amplitude-modulation (OQAM)and QAM systems, where the receiver adopts either the dither-ADC or the hysteresis-ADC. Simulation results prove that both the dither-ADC and the hysteresis-ADC are effective in improving BER performance of both OQAM and QAM systems affected by the nonlinearity of ADC, while the transmitter employs a selected mapping technique that achieves a low peak-to-average power ratio (PAPR).

    DOI: 10.1109/VTCSpring.2015.7145796

  • Quantized Perceptual Compressed Sensing for Audio Signal Compression

    Hossam Mohamed Kasem, Osumu Muta, Maha Elsabrouty, Hiroshi Frukawa

    2015 Data Compression Conference, DCC 2015 Proceedings - DCC 2015 2015 Data Compression Conference   2015.7

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    Compressed Sensing (CS) has been widely used for multimedia processing to reduce the number of the measurements required to acquire signals that are spare or compressible sparse in some basis. CS provides good quality of the restored signal even when the signal is not completely sparse and even also at high compression ratio. However, classical CS assumes that the measurements are real-valued and have infinite-bit precision that requires impractical hardware implementation. Quantized CS provides a solution to this problem. Different quantized compressed sensing techniques are developed in literature and recovery is possible even if only 1-bit is used for the quantization. In this work, we propose using different quantization vlaues, including 1-bit compressed sensing for perceptual audio signal compression in perceptual systems in order to clarify the effect of the quantization process on the achievable quality of audio signal. Mean Opinion Score (MOS) is used as metric to compare the perceived quality of audio signal of 1-bit CS and classical CS. Simulations results show that reasonable performance is achieved for different quantization CS compared to quantized classical CS.

    DOI: 10.1109/DCC.2015.52

  • Interference alignment with limited feedback for macrocell-femtocell heterogeneous networks

    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    81st IEEE Vehicular Technology Conference, VTC Spring 2015 2015 IEEE 81st Vehicular Technology Conference, VTC Spring 2015 - Proceedings   2015.7

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    Interference Alignment (IA) emerged on the communication scene as a solution to the interference problem in all interference-limited networks, including heterogeneous cellular systems. However, the performance of IA is greatly related to the accuracy of the channel state information at transmitters (CSIT), namely the number of feedback bits. Accordingly, in order to improve the performance of IA, it would be useful to analyze the number of feedback bits with respect to the sum rate loss. Motivated by that, this paper studies a limited feedback-based IA scheme suitable for two tier macrocell-femtocell heterogeneous networks. First, an approximate analytical expression for the upper bound on the total sum rate loss due to limited feedback in the studied IA system, is derived. Then, a simulation based evaluation of the sum-rate loss due to the implementation of limited feedback IA in heterogeneous networks is obtained. Simulation results conrmed the severe effect of quantization of CSI on the interference alignment performance.

    DOI: 10.1109/VTCSpring.2015.7145883

  • Interference mitigation framework based on interference alignment for femtocell-macrocell two tier cellular systems Reviewed

    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    IEICE Transactions on Communications   E98B ( 3 )   467 - 476   2015.3

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    This paper presents a downlink interference mitigation framework for two-tier heterogeneous networks, that consist of spectrumsharing macrocells and femtocells . This framework establishes cooperation between the two tiers through two algorithms, namely, the restricted waterfilling (RWF) algorithm and iterative reweighted least squares interference alignment (IRLS-IA) algorithm. The proposed framework models the macrocell-femtocell two-tier cellular system as an overlay cognitive radio system in which the macrocell system plays the role of the primary user (PU) while the femtocell networks play the role of the cognitive secondary users (SUs). Through the RWF algorithm, the macrocell basestation (MBS) cooperates with the femtocell basestations (FBSs) by releasing some of its eigenmodes to the FBSs to do their transmissions even if the traffic is heavy and the MBS's signal to noise power ratio (SNR) is high. Then, the FBSs are expected to achieve a near optimum sum rate through employing the IRLS-IA algorithm to mitigate both the co-tier and cross-tier interference at the femtocell users' (FUs) receivers. Simulation results show that the proposed IRLS-IA approach provides an improved sum rate for the femtocell users compared to the conventional IA techniques, such as the leakage minimization approach and the nuclear norm based rank constraint rank minimization approach. Additionally, the proposed framework involving both IRLS-IA and RWF algorithms provides an improved total system sum rate compared with the legacy approaches for the case of multiple femtocell networks.

    DOI: 10.1587/transcom.E98.B.467

  • Chunk-based Resource Allocation in Multi-Cell OFDMA Systems with Fairness Guarantee Reviewed International journal

    Mahmoud M. Selim, Osamu Muta, Hossam M. H. Shalaby, and Hiroshi Furukawa

    IEICE Communications Express   2015.2

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    Mahmoud M. Selim, Osamu Muta, Hossam M. H. Shalaby, and Hiroshi Furukawa, ``Chunk-based Resource Allocation in Multi-Cell OFDMA Systems with Fairness Guarantee,'' IEICE Communications Express, Vol.4, no.2, pp.31-37, February 2015.

  • Flexible Fractional K-best Sphere Decoding for Uncoded MIMO Channels Reviewed International journal

    Ibrahim Al-Nahhal, Ahmed Emran, Hossam Kasem, Adel B.Abd El-Rahman, Osamu Muta, and Hiroshi Furukawa

    IEICE Communications Express   2015.1

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    Ibrahim Al-Nahhal, Ahmed Emran, Hossam Kasem, Adel B.Abd El-Rahman, Osamu Muta, and Hiroshi Furukawa, ``Flexible Fractional K-best Sphere Decoding for Uncoded MIMO Channels,'' IEICE Communications Express, Vol.4, No.1, pp.20-25, January 2015.

  • Iterative Reweighted Least Squares Interference Alignment Approach for Multicell MIMO Networks Reviewed International journal

    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, and Hiroshi Furukawa

    IEICE Communications Express   2015.1

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    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, and Hiroshi Furukawa, ``Iterative Reweighted Least Squares Interference Alignment Approach for Multicell MIMO Networks,'' IEICE Communications Express, Vol.4, No.1, pp.1-7, January 2015.

  • A maxmin model for solving channel assignment problem in IEEE 802.11 networks

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, Hiroshi Furukawa, Haris Gacanin

    22nd European Signal Processing Conference, EUSIPCO 2014 2014 Proceedings of the 22nd European Signal Processing Conference, EUSIPCO 2014   146 - 150   2014.11

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    In this paper, an optimization model for solving the channel assignment problem in multi-cell WLANs is proposed. This model is based on maximizing the minimum distance between access points (APs) that work on the same channel. The proposed model is formulated in the form of a mixed integer linear program (MILP). The main advantage of the proposed algorithm is that it ensures non-overlapping channel assignment with no overhead power measurements. The proposed channel assignment algorithm can be implemented within practical time frames for different topology sizes. Simulation results indicate that the proposed algorithm exhibits better performance than that of the pick-first greedy algorithm and the single channel assignment method.

  • Zero-forcing relay power allocation for TDBC-based bidirectional relay networks

    Basem M. Elhalawany, Maha Elsabrouty, Osamu Muta, Adel Abdelrahman, Hiroshi Furukawa

    2014 International Conference on Information Science, Electronics and Electrical Engineering, ISEEE 2014 Proceedings - 2014 International Conference on Information Science, Electronics and Electrical Engineering, ISEEE 2014   872 - 876   2014.11

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    Although the amplify-and-forward (AF) relaying is an effective and simple technique for cooperative communication networks, it introduces a noise enhancement problem. This problem occurs when the effects of interference and the multipath fades are amplified during the transmission from the source to the relay. AF is usually used with the multiple access broadcast (MABC) protocol which is a two phases transmission (2P) analog network coding (ANC) protocol for the half-duplex (HD) communication mode. However, MABC is not designed to utilize the direct link (DL) signal no matter how strong it is. To utilize the DL signal, a three transmission phases protocol known as time-division broadcast protocol (TDBC) was proposed at which both end nodes transmit their message at consecutive time slots and the relay nodes broadcasts a combined signal at the 3rd time slot. To deal with the noise enhancement problem and improve the system performance, this paper proposes a zero-forcing based relay power allocation (ZF-RPA) scheme to be used with TDBC protocol, where the noise enhancement is mitigated by introducing adaptive ZF gains at the relay node that inverses the channels effects between sources and relay when the signal is constructed to be transmitted at the third phase of the TDBC. Analytical results of the ZF-RPA scheme is compared to the traditional variable-gain (VG-RPA) scheme under the same nodes power allocation. Simulation results show that the ZF-RPA is superior for all channel qualities in terms of the outage probability compared to the traditional VG-RPA. The total system sum rate comparison reveals that the ZF-RPA scheme could outperform the VG-RPA scheme as long as the channel qualities of the relay-transceiver links are less than certain threshold. This paper also clarifies that it is effective to select either ZF or VG-RPA according to the channel qualities and it can be implemented with VHDL by introducing an adaptive control unit (ACU).

    DOI: 10.1109/InfoSEEE.2014.6947792

  • Wide-band cooperative compressive spectrum sensing for cognitive radio systems using distributed sensing matrix

    Mohammed Farrag, Osamu Muta, Mostafa El-Khamy, Hiroshi Furukawa, Mohamed El-Sharkawy

    80th IEEE Vehicular Technology Conference, VTC 2014-Fall 2014 IEEE 80th Vehicular Technology Conference, VTC2014-Fall, Proceedings   2014.11

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    In this paper, cooperative compressive spectrum sensing is considered to enable accurate sensing of the wide-band spectrum. The proposed algorithm is based on compressive sensing theory and aims to reduce the hardware complexity of the cognitive radio receiver by distributing the sensing work among groups of sensing nodes. The proposed algorithm classies the cooperated sensing nodes into different sensing groups depending on the quality of the reporting channel between the sensing node and the fusion center (FC). To sense the wide- band analog signal and take a global decision about spectrum occupancy, each node uses its local sensing matrix, which is assigned to its sensing group and a part of a global sensing matrix at the FC. The size of the local sensing matrix of each sensing node,and consequently the contribution of this node in the overall measurement vector, depends on its sensing group. The FC classies and rearranges the compressed data to formulate one global measurement vector which is used with a global sensing matrix to estimate the wide-band signal spectrum. The receiver operation characteristics (ROC) of the overall spectrum sensing system show that the proposed receiver provides more protection to primary users (higher detection probability) at the same secondary user throughput (probability of false alarm).

    DOI: 10.1109/VTCFall.2014.6966230

  • Underlay MIMO cognitive transceivers designs with channel uncertainty Reviewed

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Osamu Muta, Hiroshi Furukawa

    IEICE Transactions on Communications   E97B ( 11 )   2543 - 2551   2014.11

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    Underlay cognitive radio (CR) permits unlicensed secondary users (SUs) to transmit their own data over the licensed spectrum unless the interference from the SUs on the licensed primary user (PU) exceeds an acceptable level. This paper proposes two generalized interference alignment (IA)-based distributed optimization designs for multiple secondary transceivers in the underlay CR case with channel uncertainty under assumption that the actual channel error norm is below a certain bound. One of the designs is an extension to an existing method and the other one is a new design. In these methods, the precoding and power allocation matrices for each SU are either independently or jointly optimized for imperfect channel knowledge to maximize the secondary rates and to hold the secondary interference on the primary receiver under an acceptable limit that is determined by the primary receiver. Numerical results prove the ability of the proposed methods to support significant secondary rates provided that the PU is protected from extra interference from SUs, even in presence of channel uncertainty.

    DOI: 10.1587/transcom.E97.B.2543

  • Area spectral efficiency performance comparison of downlink fractional frequency reuse schemes for MIMO heterogeneous networks

    Sherief Hashima, Osamu Muta, Masoud Alghonimey, Hossam Shalaby, Hiroshi Frukawa, Said Elnoubi, Imbaby Mahmoud

    2014 International Conference on Information Science, Electronics and Electrical Engineering, ISEEE 2014 Proceedings - 2014 International Conference on Information Science, Electronics and Electrical Engineering, ISEEE 2014   1005 - 1010   2014.11

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    In cellular networks, fractional frequency reuse (FFR) is an effective inter-cell interference mitigation technique to achieve significant coverage improvement for cell edge users. Area Spectral Efficiency (ASE) is an important and vital factor to be improved in cellular networks and is defined as the number of transmitted information bits per unit area per unit time per unit bandwidth (i.e., bps/Hz/m2). In this paper, we compare ASE of different downlink FFR schemes in MIMO Heterogeneous cellular networks (MIMO HetNets), where the base station (BS) locations are modeled using Poission Point Process (PPP). Stochastic PPP is widely used in the design and analysis of signal processing algorithms especially for communication systems. ASEs are evaluated based on coverage probability functions for Strict FFR and Soft Frequency Reuse (SFR) in MIMO HetNets for both closed and open access cases. In the same time we illustrate not only the role but also the benefits of utilizing PPP in modeling the BS locations for analytical evaluation of two main types of FFR deployments. Numerical results show that, for SFR in both open and closed access cases, it is better to use MIMO HetNets than other techniques due to large interference resulted from utilizing the whole bandwidth inside the cell. Also, in SFR case, ASE is directly proportional to the power control factor βk. For Strict FFR MIMO HetNet open access case, SDMA with large numbers of antenna provides higher ASE at the expense of system complexity. For better ASE in MIMO HetNet system, it is recommended to use adaptive technique between strict FFR MIMO and MU-MIMO in terms of target threshold value of signal-to-interference ratio (SIR).

    DOI: 10.1109/InfoSEEE.2014.6947820

  • Iterative interference alignment in macrocell-femtocell networks A cognitive radio approach

    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, Hiroshi Fumkawa

    2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings   654 - 658   2014.10

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    The deployment of femtocells in current and future communication systems promises an effective solution for limited indoor coverage problem and a possible gateway for mobile data offloading. In this paper, we cast a cognitive interference alignment approach (IA) suitable for heterogeneous cellular networks with a mixed macrocell and femtocell deployment Specifically, in our approach a restricted waterfilling (RWF) algorithm is used to maximize the downlink data rate, while reserving some eigenmodes for giving the femtocell basestations the opportunity to do their transmissions even at high signal-to-noise power ratio (SNR) for the macrocell basestation. Additionally, both the cross-tier and co-tier interference is to be aligned at each femtocell user's receiver using an Iterative Reweighted Least Squares(IRLS) algorithm. The simulation results show that the proposed IA approach provides an improved sum rate for the femtocell users, compared to the conventional IA techniques, like, the leakage minimization approach and the nuclear norm based rank constraint rank minimization approach.

    DOI: 10.1109/ISWCS.2014.6933435

  • Low Complexity QoS-aware Subcarrier Allocation forMISO-OFDMA Systems Reviewed International journal

    Mahmoud M. Selim, Osamu Muta, Hossam M. H. Shalaby, and Hiroshi Furukawa

    IEICE Communications Express   2014.8

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    Mahmoud M. Selim, Osamu Muta, Hossam M. H. Shalaby, and Hiroshi Furukawa, ``Low Complexity QoS-aware Subcarrier Allocation forMISO-OFDMA Systems,'' IEICE Communications Express, Vol. 3 No. 8, pp. 235-240, Aug. 2014.

  • A peak power aware linear-precoding scheme for MIMO-SDM systems

    Satoshi Takabatake, Osamu Muta, Hiroshi Furukawa

    2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, PIMRC 2014   397 - 401   2014.6

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    In MIMO space division multIPlexing (SDM) systems, the peak power of the transmit signal at each antenna element is increased by the precoder and hence it causes the power efficiency degradation and/or nonlinear distortion at the power amplifier. To solve this problem, this paper present a peak power aware precoding scheme for MIMO-SDM systems, where the precoder is designed to mitigate the peak output power at each antenna element so that peak amplitude of the transmit signal at each antenna is reduced while minimizing the performance degradation caused by the peak power restriction. The proposed system employs an aLTErnative iterative optimization algorithm that determines the precoding matrix so that the precoding and virtual post-coding matrices are aLTErnatively optimized under the constraint of peak output at each antenna element. Simulation results show that the proposed method is effective in restricting the peak transmission power at each antenna within a permissible level while mitigating performance degradation in bit error rate (BER) performance of the precoded SDM systems.

    DOI: 10.1109/PIMRC.2014.7136197

  • A Maxmin Approach for Channel Assignment in Multi-cell WLANs Reviewed International journal

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, and Hiroshi Furukawa

    IEICE Communications Express   2014.5

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    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, and Hiroshi Furukawa, ``A Maxmin Approach for Channel Assignment in Multi-cell WLANs,'' IEICE Communications Express, Vol.3, No.5, pp.175-181, May 2014.

  • Effects of MLSE equalization for constant envelope modulation signals affected by ADC nonlinearity

    Ryuta Fukunaga, Osamu Muta, Hiroshi Furukawa

    2014 28th International Conference on Information Networking, ICOIN 2014 International Conference on Information Networking 2014, ICOIN 2014   530 - 535   2014.1

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    A radio relay multi-hop transmission using Multi-Input Multi-Output (MIMO) is a promising technique to construct indoor wireless communication systems. To improve power efficiency at the power amplifier on the transmitter side, this paper considers MIMO constant envelope modulation (CEM) transceiver. On the other hand, the resolution of A/D converter (ADC) affects hardware complexity on MIMO receiver circuits. Although analog hardware complexity on MIMO receiver circuits can be reduced by decreasing the resolution of ADC, it causes severe ADC nonlinearity which affects achievable performance, i.e., there a trade-off between hardware complexity and non-linearity on ADC circuits for MIMO receiver. The objective of this paper is to investigate the influence of ADC nonlinearity on achievable performance in MIMO differential encoded Gaussian minimum shift keying (D-GMSK) systems using a reduced-state modified maximum sequence estimation (MLSE) equalization. In the MLSE equalization for D-GMSK systems, the influence of ADC nonlinearity is mitigated by approximating the received signal in presence of quantization error. Computer simulation results show that the MLSE equalization scheme approximating the influence of ADC nonlinearity improves BER performance of MIMO and SISO D-GMSK systems using a low resolution ADC compared to cases without using the above approximation in multi-path Rayleigh fading conditions.

    DOI: 10.1109/ICOIN.2014.6799738

  • Performance of an E-SDM/FDD system using an iterative weight optimization and control algorithm

    Yusuke Oki, Osamu Muta, Hiroshi Furukawa

    2014 IEEE International Conference on Communication Systems, IEEE ICCS 2014 2014 IEEE International Conference on Communication Systems, IEEE ICCS 2014   595 - 599   2014.1

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    This paper investigates an iterative algorithm to control weighting coefficients of transmit/receive spatial filters in a frequency-division duplex (FDD) based eigen-mode space division multiplexing (E-SDM/FDD) system. In this system, weighting matrices of transmit/receive spatial filters are optimized using an iterative algorithm that minimizes the mean square error (MSE) of the virtual received signal, where the receiver feeds back relative channel characteristic information of the forward-link to the transmitter. This paper also presents an alternative feedback control method for optimizing the weighting coefficients of the transmit spatial filter in presence of feedback bit errors; the receiver determines the weighting coefficients at the transmitter and sends back relative information of them to the transmitter. This method will be able to mitigate the performance degradation caused by the feedback bit error. Simulation results of bit error rate (BER) performance proves the effectiveness of the proposed algorithm in the E-SDM/FDD 4 × 2 MIMO systems.

    DOI: 10.1109/ICCS.2014.7024872

  • Performance evaluation of OQAM based OFDM systems using an ACLR and EVM restricted peak amplitude cancellation scheme

    Takaya Hino, Osamu Muta, Hiroshi Furukawa

    2014 IEEE International Conference on Communication Systems, IEEE ICCS 2014 2014 IEEE International Conference on Communication Systems, IEEE ICCS 2014   419 - 423   2014.1

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    In this paper, we investigate the performance of offset quadrature amplitude modulation based orthogonal frequency division multiplexing (OQAM-OFDM) systems using an adjacent channel leakage power ratio (ACLR) and error vector magnitude (EVM) restricted peak amplitude cancellation scheme for peak-to-average power ratio (PAPR) reduction, where peak amplitude of the transmit signal that exceeds a give threshold level is iteratively suppressed by adding a peak cancellation (PC) signal which exhibits sharp peak amplitude at the midpoint of pulse waveform in time domain. In addition, using this scheme, both ACLR and EVM are automatically adjusted so as to meet a given requirement. In the proposed scheme, both PAPR reduction performance and system requirements such as out-of-band spectrum radiation and in-band distortion are simultaneously taken into consideration. Through computer simulation results, it is demonstrated that the proposed PAPR reduction scheme is effective in reducing PAPR of pulse shaped OQAM-OFDM signals, while both ACLR and EVM requirements are simultaneously fulfilled.

    DOI: 10.1109/ICCS.2014.7024837

  • Low complexity channel assignment for IEEE 802.11b/g multi-cell WLANs Reviewed

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Hiroshi Furukawa

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E97-A ( 8 )   1761 - 1769   2014.1

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    Wireless Local Area Networks (WLANs) are widely deployed for internet access. Multiple interfering Access Points (APs) lead to a significant increase in collisions, that reduces throughput and affects media traffic. Thus, interference mitigation among different APs becomes a crucial issue in Multi-Cell WLAN systems. One solution to this issue is to assign a different frequency channel to each AP so as to prevent neighboring cells from operating on the same channel. However, most of the existing WLANs today operate in the unlicensed 2.4 GHz Industrial, Scientific and Medical (ISM) band, which suffers from lack of the available channels. Therefore, effective channel assignment to minimize the interference in Multi-Cell WLANs is necessary. In this article, we formulate the channel assignment problem as a mixed integer linear programming (MILP) problem that minimizes the worst case total interference power. The main advantage of this algorithm is that it provides a global solution and at the same time guarantees a non-overlapping channel assignment. We also propose a Lagrangian relaxation approach to transform the MILP into a low complexity linear program which can be solved efficiently in real time, even for large sized networks. Simulation results reveal that both the MILP algorithm and the Lagrangian relaxation approach provide a total interference reduction below the default setting of having all APs assigned the same channel. In addition, simulation results on cumulative density function (CDF) of the SINR at the user level prove the validity of the proposed algorithms.

    DOI: 10.1587/transfun.E97.A.1761

  • Linearity enhancement technique for one bit A/D converter in wireless communication devices

    Daisuke Kanemoto, Takahide Sato, Makoto Ohki, Osamu Muta, Hiroshi Furukawa

    18th IEEE International Symposium on Consumer Electronics, ISCE 2014 ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics   2014.1

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    In this paper, a novel one bit resolution ADC for wireless communication devices is presented. If we use a conventional one bit resolution ADC for wireless communication devices, the communication quality becomes worse due to heavy non-linearity. To overcome this problem, we proposed a novel one bit resolution ADC circuit with linearity enhancement technique, which uses a S/H and a hysteresis comparator. By using hysteresis effect, the periodicity of one bit resolution ADC output signal can be reduced. Signal-to-Quantization-Noise Ratio (SQNR) can be improved by 6.4dB, thanks to the proposed technique.

    DOI: 10.1109/ISCE.2014.6884368

  • Joint energy-efficient single relay selection and power allocation for analog network coding with three transmission phases Reviewed

    Basem M. Elhalawany, Maha Elsabrouty, Osamu Muta, Adel Abdelrahman, Hiroshi Furukawa

    2014 79th IEEE Vehicular Technology Conference, VTC 2014-Spring IEEE Vehicular Technology Conference   2015-January ( January )   2014.1

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    The multiple access broadcast (MABC) is an effective two phases transmission (2P) ANC protocol for the half-duplex (HD) communication mode. However, MABC does not make use of channel gain of the direct link (DL) no matter how strong it is. On the other hand, the time division broadcast (TDBC) is known as a three phases transmission (3P) protocol which enables transceivers to utilize DL and thus offers the possibility to achieve higher performance compared with the MABC at the expense of a reduced spectral efficiency due to the one extra transmission phase. In this paper, we investigate a joint single relay selection and power allocation schemes for energy-efficient wireless communication systems with analog network coding (ANC) for TDBC, where two-way relay channel with two end nodes and N parallel relay nodes is considered under an assumption of perfect channel-state information (CSI). Our objective is to minimize the total system transmit power consumption under quality-of-service (QoS) constraints for TDBC protocol with joint single relay selection and nodes power allocation. In addition, a zero-forcing based relay signal combining technique that combines the signals received at the 1st and 2nd transmission phases, also known as zero-forcing relay power allocation (ZF-RPA), is also investigated. Numerical simulation shows that the traditional VG-RPA is more energy-efficient than the ZF-RPA scheme for TDBC in cases with and without utilizing DL.

    DOI: 10.1109/VTCSpring.2014.7022964

  • Fairness aware chunk-based resource allocation in multi-cell OFDMA networks

    Mahmoud M. Selim, Osamu Muta, Hossam Shalaby, Hiroshi Furukawa

    3rd International Conference on Connected Vehicles and Expo, ICCVE 2014 2014 International Conference on Connected Vehicles and Expo, ICCVE 2014 - Proceedings   994 - 999   2014.1

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    Resource allocation (RA) in multi-cell OFDMA systems is very important for maximizing system throughput. Although sub-channel RA is optimal in terms of system throughput, more interest is given to chunk-based RA so as to simplify allocation algorithms and minimize required signalling. In this paper, we propose a fairness-aware chunk-based RA algorithm for the downlink transmission of multi-cell OFDMA system with fractional frequency reuse (FFR) adoption. Simulation results reveal that our proposed algorithm outperforms two reference algorithms in literature in terms of some system metrics such as average system spectral efficiency (SE), users fairness and rates of cell-edge users.

    DOI: 10.1109/ICCVE.2014.7297707

  • Energy-efficient design for TDBC-based two-way relay network with weighted fairness

    Basem M. Elhalawany, Osamu Muta, Maha Elsabrouty, Hiroshi Furukawa

    3rd International Conference on Connected Vehicles and Expo, ICCVE 2014 2014 International Conference on Connected Vehicles and Expo, ICCVE 2014 - Proceedings   968 - 973   2014.1

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    In two-way relay network (TWRN), end nodes may have different quality-of-service (QoS) requirements according to their priority, traffic demand, and/or their downlink and uplink split ratio. In this paper, the heterogeneity among network users that have different traffic load/demands is considered by assuming a weighted fairness between the two end nodes. An energy efficient design is proposed for two-way relaying (TWR) with time division broadcast (TDBC) protocol that minimizes the allocated power to the two transceivers and the relay node under a weighted quality-of-service (QoS) bidirectional data rates requirement with weighting factor (a). This design utilizes the signal combining process at the relay node in TDBC, also known as relay power allocation (RPA), to provide a new simpler way to ensure the weighted rates without increasing the complexity to control different power allocation of the three nodes. Adaptive calculation of the relay power allocation factor, e, is adopted for combining the two received signals to satisfy the QoS requirements. Simulation results show an improvement in the efficiency in terms of the average allocated power and an improved users' fairness compared with scenarios where a predetermined fixed value of e is used.

    DOI: 10.1109/ICCVE.2014.7297702

  • Performance analysis of uplink Fractional Frequency Reuse using worst case Signal to Interference Ratio

    Sherief Hashima, Hossam Shalaby, Said Elnoubi, Masoud Alghoniemy, Osamu Muta, Hiroshi Furukawa

    2013 Science and Information Conference, SAI 2013 Proceedings of 2013 Science and Information Conference, SAI 2013   839 - 844   2013.12

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    Fractional Frequency Reuse (FFR) is an efficient mitigation technique for modern cellular networks because of its low complexity and coordination requirements and resource allocation flexibility. This work considers the use of FFR in the cellular uplink where we analyze the uplink worst case Signal to Interference Ratio (SIR) for two main FFR schemes; which are strict FFR and Soft FFR. A closed form expression is derived analytically for the worst SIR and for the best inner radius. This analytical technique is utilized to configure a FFR solution for the uplink of OFDMA cellular system. The analysis is performed using two-tier cellular network with uniform user density and for three different cases of FFR. The effect of power control exponent on both FFR schemes is also studied. The inner radius configuration depends on equalizing the worst SIR for both inner and outer edges of the cell. Numerical results show that FFR with reuse four yields the highest SIR. It is noticed that power control exponent doesn't affect strict FFR but affects SFR as it reduces its SIR and inner radius.

  • Underlay MIMO cognitive transceivers design with channel uncertainty

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Osamu Muta, Hiroshi Furukawa

    2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013   1019 - 1023   2013.12

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    Underlay cognitive radio (CR) permits unlicensed secondary users (SUs) to transmit their own data over the licensed spectrum unless the interference from the SUs on the licensed primary user (PU) exceeds an acceptable level. This paper proposes two interference alignment (IA)-based distributed optimization designs for multiple secondary transceivers in underlay cognitive radio case with channel uncertainty. The precoding and power allocation matrices for each SU are either independently or jointly optimized for imperfect channel knowledge to maximize the secondary rates and to control the secondary interference on the primary receiver to be below the acceptable limit that is determined by the primary receiver. Numerical results prove the ability of the proposed methods to support significant secondary rates and to protect the PU from extra interference, within the acceptable primary range, even in presence of channel uncertainty case. In addition, joint optimization design has higher secondary performance than the independent optimization design.

    DOI: 10.1109/PIMRC.2013.6666287

  • Performance analysis of fractional frequency reuse based on worst case signal to interference ratio in OFDMA downlink systems

    Sherief Hashima, Hossam Shalaby, Masoud Alghoniemy, Osamu Muta, Hiroshi Furukawa

    2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013   616 - 620   2013.12

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    Fractional Frequency Reuse (FFR) is an efficient method to mitigate Inter Cell Interference in multicellular Orthogonal Frequency Division Multiple Access (OFDMA) systems. In this paper, we analyze the downlink worst case Signal to Interference Ratio for FFR schemes. A closed form expression is derived analytically for the worst SIR, outage probability, and Spectral Efficiency (SE). The proposed analytical technique is used to configure a FFR solution for the downlink of OFDMA cellular system. The analysis is performed using two-tiers cellular network with uniform user density and for three different cases of FFR, namely, Frequency Reuse Factor (FRF) = 3, FRF=4 and sectored FFR. The inner radius configuration depends on equalizing the worst SIR for both inner and outer edges of the cell. Numerical results show that sectored FFR yields the highest SE and low outage probability. Sectored FFR highly balances the needs of interference reduction and resource efficiency.

    DOI: 10.1109/PIMRC.2013.6666210

  • Analysis of frequency reuse cellular systems using worst case Signal to Interference ratio

    Sherief Hashima, Said Elnoubi, Masoud Alghoniemy, Hossam Shalaby, Osamu Muta, Imbaby Mahmoud

    12th International Conference on Telecommunications, ConTEL 2013 Proceedings of the 12th International Conference on Telecommunications, ConTEL 2013   185 - 190   2013.9

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    Frequency reuse schemes are an interference management techniques well suited to OFDMA-based cellular networks. In this paper, analytical expressions are derived for the worst case Signal to Interference Ratio (SIR) ratio for both Fractional Frequency Reuse (FFR), and Soft Frequency Reuse (SFR). Also, analytical expressions are derived for the best inner radius using the worst SIR in both FFR, and SFR schemes. The analysis is performed in cellular network using exponent path loss model. The results showed that FFR with reuse four has the smallest interference hence better edge spectral effiency than SFR with different power ratios. For SFR it is better to use power ratios between 2, 4 as they achieve reasonable inner radii than other power ratios. The analysis showed that there is tradeoff aspect between capacity and coverage related to SFR and FFR respectively.

  • Lagrangian relaxation approach for low complexity channel assignment in multi-cell wlans

    Mohamed Elwekeil, Masoud Alghoniemy, Hiroshi Furukawa, Osamu Muta

    2013 International Conference on Computing, Networking and Communications, ICNC 2013 2013 International Conference on Computing, Networking and Communications, ICNC 2013   138 - 142   2013.5

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    The Channel assignment problem for multi-cell WLANs is important due to the lack of free available channels. Usually, this problem can be formulated as a mixed integer linear program (MILP) which requires high combinatorial complexity. In this paper, a lagrangian relaxation technique is used in order to transform the MILP into a low complexity linear program. Simulation results show that the proposed channel assignment algorithm provides significant reduction in complexity compared to the MILP counterpart at the expense of insignificant increase in total interference-sum at Access Points (APs). It is also suggested that the benefits of reduced complexity outweigh the increased interference.

    DOI: 10.1109/ICCNC.2013.6504069

  • Joint optimization design for single underlay cognitive transceiver with channel uncertainty Reviewed International journal

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Osamu Muta, Hiroshi Furukawa

    IEICE Communications Express   2013.2

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  • Iterative Reweighted Least Squares approach to interference alignment

    Mohamed Rihan, Maha Elsabrouty, Said Elnouby, Hossam Shalaby, Osamu Muta, Hiroshi Furukawa

    6th IFIP/IEEE Wireless Days Conference, WD 2013 2013 IFIP Wireless Days, WD 2013   2013.1

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    This paper investigates the interference alignment (IA) solution for a K-user static flat-fading multiple input multiple output (MIMO) interference channel. Optimal users' precoders and postcoders are designed through a rank constraint rank minimization (RCRM) framework with IA conditions inserted within the constraints and the cost function of a complex matrix optimization problem. With RCRM formulation, the interference is forced to span the lowest dimensional subspace possible, under the condition that the useful signal subspaces span all available spatial dimensions. Using the recent advances in matrix completion theory and low rank matrix recovery theory, we propose an Iterative Reweighted Least Squares (IRLS) approach to IA. Through this approach, we provide an adequate relaxation for the rank function which in some cases attain the same results obtained using the standard nuclear norm with lower elapsed time per iteration and lower number of iterations and in some cases perform better than any of the previous approaches.

    DOI: 10.1109/WD.2013.6686521

  • Adaptive peak power cancellation scheme under the requirements of ACLR and EVM for MIMO-OFDM systems

    Takaya Hino, Osamu Muta

    2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2012 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2012   1974 - 1978   2012.12

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    In this paper, we propose a peak-to-average power ratio (PAPR) reduction scheme based on adaptive peak amplitude cancellation for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, where peak amplitude of OFDM signal is iteratively suppressed by adding a specific peak cancellation (PC) signal which has flat frequency spectrum over signal bandwidth in frequency domain and sharp peak amplitude at the midpoint of pulse waveform in time domain. In the proposed scheme, both adjacent channel leakage power ratio (ACLR) and error vector magnitude (EVM) are automatically adjusted so as to meet a given requirement. In the proposed scheme, both PAPR reduction performance and system requirements such as out-of-band spectrum radiation and in-band distortion are simultaneously taken into consideration; both ACLR and EVM are automatically controlled to meet the requirements. Computer simulation results prove that the proposed PAPR suppression scheme effectively reduce PAPR of the OFDM signal in MIMO systems, while both ACLR and BER requirements are simultaneously fulfilled.

    DOI: 10.1109/PIMRC.2012.6362676

  • Optimal channel assignment for IEEE 802.11 Multi-cell WLANs

    Mohamed Elwekeil, Masoud Alghoniemy, Mostafa El-Khamy, Hiroshi Furukawa, Osamu Muta

    20th European Signal Processing Conference, EUSIPCO 2012 Proceedings of the 20th European Signal Processing Conference, EUSIPCO 2012   694 - 698   2012.11

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    In this paper, we propose a new formulation for solving the channel assignment problem for Multi-cell WLANs as a mixed integer linear programming (MILP) problem. The objective is to minimize the total interference seen by all Access Points (APs). The main advantage of the proposed algorithm is that it provides a global solution and at the same time guarantees non-overlapping channel assignment. The proposed channel assignment formulation can be used for different topologies of WLAN as demonstrated in the simulation. Simulation results show that the proposed algorithm outperforms the pick-first greedy algorithm and the single channel assignment method. The proposed channel assignment technique reduces the total interference at all APs which leads to an improved throughput.

  • An efficient equalization scheme for constant envelope modulation receiver affected by quantization error

    Kohei Kotera, Osamu Muta, Hiroshi Furukawa

    2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012 Proceedings of the 2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012   122 - 126   2012.5

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    The authors have proposed constant envelope modulation (CEM) systems that enable to use a power-efficient nonlinear power amplifier on the transmitter side and a low resolution analog-to-digital converter (ADC) on the receiving side, where power consumption at the analog devices is effectively reduced by employing a low resolution ADC at the receiver. In such a receiver, the received signal is seriously affected by severe quantization error by the ADC and therefore BER performance is degraded. As a solution to performance degradation at the CEM receiver affected by quantization error, in this paper, we propose efficient nonlinear (Viterbi) equalization schemes that estimate both inter-symbol interference in multi-path channel and quantization error in ADC, where quantization error is estimated by using a simple function that models the relation between the received signal level and the resulting quantization error. In addition, the proposed scheme effectively reduces the number of states in Viterbi equalization to achieve computational complexity reduction for equalizations. Computer simulation results show that the proposed nonlinear equalization scheme improves BER performance of CEM receiver seriously affected by quantization error, while computational complexity is effectively reduced.

    DOI: 10.1109/JEC-ECC.2012.6186969

  • Efficient nonlinear equalization scheme for MIMO constant envelope modulation receivers affected by quantization error

    Kohei Kotera, Osamu Muta, Hiroshi Furukawa

    26th International Conference on Information Networking 2012, ICOIN 2012 International Conference on Information Networking 2012, ICOIN 2012 - Conference Program   275 - 279   2012.5

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    The authors have proposed Multi-Input Multi-Output (MIMO) constant envelope modulation (CEM) systems that enable to use a power-efficient nonlinear power amplifier on the transmitter side and a low resolution analog-to-digital converter (ADC) on the receiver side, where power consumption at the analog devices is effectively reduced by employing a low resolution ADC at the receiver. In such a receiver, the received signal is seriously affected by severe quantization error by the ADC and therefore BER performance is degraded. As a solution to performance degradation at the MIMO-CEM receiver affected by quantization error, in this paper, we propose efficient nonlinear (Viterbi) equalization schemes that estimate both inter-symbol interference in multi-path channel and quantization error in ADC, where quantization error is estimated by using a simple function that models the relation between the received signal level and the resulting quantization error. In addition, the proposed scheme effectively reduces the number of states in Viterbi equalization to achieve computational complexity reduction for equalizations. Computer simulation results show that the proposal nonlinear equalization scheme improves BER performance of MIMO-CEM receiver seriously affected by quantization error, while computational complexity is effectively reduced.

    DOI: 10.1109/ICOIN.2012.6164391

  • Adaptive channel estimation for MIMO-constant envelope modulation Reviewed

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    IEICE Transactions on Communications   E95-B ( 7 )   2393 - 2404   2012.1

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    The authors have proposed Multi-Input Multi-Output (MIMO)-Constant Envelope Modulation, (MIMO-CEM), as a power and complexity efficient alternative to MIMO-OFDM, suitable for wireless backhaul networks in which relay nodes are fixed in their positions. One of the major problems hindering the real application of MIMO-CEM is to estimate MIMO channel characteristics. MIMO-CEM is based upon two contrary schemes; one is nonlinear equalization such as maximum likelihood sequence estimator, which needs accurate channel information to replicate the received signal passing through it. The other is a low resolution analog-to-digital converter (ADC), e.g., 1-bit in the default operation that removes the received signal amplitude fluctuation. In this paper, as a solution to the channel estimation problem in MIMO-CEM with low resolution ADC receiver, we propose an adaptive MIMO-CEM channel estimation scheme where iterative adaptive channel estimation is carried out to minimize the error between the received preamble signal and the replicated one. We also prove that Code Division Multiplexing (CDM) preamble transmission is effective in estimating MIMO channel parameters in the presence of large quantization noise. Computer simulation results show that MIMO-CEM with the proposed channel estimator using CDM preambles achieves identical BER performance to that with the ideal channel estimation even in presence of severe quantization noise caused by a low resolution ADC.

    DOI: 10.1587/transcom.E95.B.2393

  • Partial scrambling PAPR reduction for multi-code vector coding in adaptive modulated MIMO systems

    Osamu Muta

    17th International OFDM Workshop 2012, InOWo 2012 17th International OFDM Workshop 2012, InOWo 2012   2012.1

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    Multi-Input Multi-Output (MIMO) Vector coding (VC) transmission with adaptive modulation is an effective technique to enhance transmission performance in frequency selective wireless channels. The VC is a kind of code-division multiplexing (CDM) by which eigenvectors of channel autocorrelation matrix are used as spreading code. A major disadvantage of the VC is that the transmit signal exhibits high peak-to average power ratio (PAPR), which causes nonlinear distortion and/or power efficiency degradation at a power amplifier, similarly to OFDM and CDM systems. As a solution to this problem, selected mapping (SLM) PAPR reduction techniques have been studied. This paper presents a partial scrambling SLM PAPR reduction method for multi-code VC transmission in adaptive modulated MIMO systems. In this method, PAPR of the transmit signal is reduced to scramble bit sequence mapped on limited number of code vectors in VC systems. In addition, the maximum amplitude of transmit signal in each transmission block is reduced only when the maximum peak amplitude exceeds a given threshold value. Simulation results clarify that the partial scrambling method achieves better average throughput performance than the conventional method, although almost identical PAPR reduction performance is obtained for MIMO VC systems in an attenuated six-path Rayleigh fading condition.

  • Effect of phase control-based peak-to-average power ratio reduction on multi-input multi-output adaptive modulated vector coding systems Reviewed

    O. Muta

    IET Communications   6 ( 16 )   2769 - 2774   2012.1

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    As a solution to high peak-to-average power ratio (PAPR) problems in vector coding (VC) systems, phase controlbased methods such as selected mapping (SLM) and partial transmit sequence have been investigated. As described in this study, a phase sequence blind estimation method is presented for PAPR reduction based on phase control in multi-input multi-output (MIMO) adaptive modulated VC systems, where turbo code is employed. On the receiver side, the phase sequence component is estimated using a maximum likelihood method that selects the most likely sequence among all candidate sequences by exploiting soft-output information of the decoder. Computer simulation results show that when the number of candidate sequences in SLM is M = 16, instantaneous power of the transmit signal at the complementary cumulative distribution function of 10-5 can be reduced by about 4.0 and 3.5 dB for single-input single-output and MIMO cases as compared with the case without PAPR reduction, although almost identical block error rate performance and the same throughput performance as in the case of perfect phase sequence estimation are achieved in an attenuated six-path Rayleigh fading condition.

    DOI: 10.1049/iet-com.2012.0139

  • Performance evaluation of wireless multi-hop networks with directional antennas in an indoor radio propagation channel

    Ximing Huang, Osamu Muta, Hiroshi Furukawa

    2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012 Proceedings of the 2012 Japan-Egypt Conference on Electronics, Communications and Computers, JEC-ECC 2012   41 - 46   2012

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    Wireless backhaul systems have been considered as a promising candidate of beyond 3G wireless broadband system for mobile communications. The achievable transmission performance over radio relay channel depends on antenna directivity and radiation patterns of each antenna element. To improve the transmission performance and keep radio relay channel in an acceptable condition, it is effective to control the antenna directivity by employing multi-antenna signal transmission and reception. For this purpose, we have proposed a simple method to extend the existing single antenna relay node based on IEEE802.11a to multi-antenna system, where a cross configuration multi-antenna is applied to the existing relay nodes as external equipment. The multi-antenna system is controlled by detecting the antenna control information assigned to the lengths of the packets transmitted from the existing node. In this paper, to clarify the effectiveness of multi-antenna system in wireless multi-hop networks, we show an indoor radio propagation model based on two dimensional ray-tracing that provides realistic indoor channel characteristics and evaluate throughput performance by system level simulations. Simulation results ensure that application of directional antenna to multi-hop networks with highly efficient packet forwarding protocol, called Intermittent Periodic Transmit (IPT), improves throughput performance of the radio relay transmission in wireless backhaul.

    DOI: 10.1109/JEC-ECC.2012.6186954

  • Effect of phase control based PAPR reduction in MIMO adaptive modulated vector coding systems

    Osamu Muta

    2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011   2011.12

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    As a solution to high peak-to-average power ratio (PAPR) problems in vector coding (VC) systems, phase control based methods such as selected mapping and partial transmit sequence have been investigated. In this paper, a phase sequence blind estimation method is presented for PAPR reduction based on phase control in multi-input multi-output (MIMO) adaptive modulated vector coding systems, where Turbo code is employed. On the receiver side, the phase sequence component is estimated using a maximum likelihood method which selects the most likelihood sequence among all candidate ones by exploiting soft-output information of the decoder. Computer simulation results show that when the number of candidate sequences in SLM is M 16, instantaneous power of the transmit signal at the CCDF of 10 6 can be reduced by about 4.5dB and 3.4dB for SISO and MIMO cases as compared to case without PAPR reduction, while almost the same block error rate (BLER) performance and the same throughput performance as case of the prefect phase sequence estimation are achieved in attenuated 6-path Rayleigh fading condition.

    DOI: 10.1109/WCSP.2011.6096816

  • Static and dynamic channel estimation techniques for MIMO-Constant Envelope Modulation

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    2011 IEEE GLOBECOM Workshops, GC Wkshps 2011 2011 IEEE GLOBECOM Workshops, GC Wkshps 2011   549 - 554   2011.12

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    The authors have proposed Multi-Input Multi-Output (MIMO)-Constant Envelope Modulation (MIMO-CEM), as power and complexity efficient alternative to MIMO-OFDM, suitable for wireless backhaul networks. One of the major problems to withstand real application of MIMO-CEM is to estimate MIMO channel characteristics. The MIMO-CEM is based upon two contrary schemes; one is nonlinear Maximum Likelihood Sequence Estimator (MLSE), which needs accurate channel information to replicate the received signal passing through it. The other is a low resolution analog-to-digital converter (ADC), e.g., 1-bit in the default operation that removes the received signal amplitude fluctuation. This paper considers channel estimation problem in MIMO-CEM. First, we propose a MIMO-CEM adaptive channel estimator, in static and quasi-static channel conditions, based upon Code Division Multiplexing (CDM) preambles transmission, where channel parameters are iteratively estimated by observing the received MIMO preambles. Then, we extended the proposed CDM preamble method to Decision Directed Channel Estimation (DDCE) to track MIMO-CEM channel in high Doppler frequency conditions and clarify the effectiveness of MIMO-CEM in dynamic channel conditions.

    DOI: 10.1109/GLOCOMW.2011.6162510

  • Phase-sequence blind estimation for phase-rotation based PAPR reduction in MIMO coded-OFDM systems

    Osamu Muta

    5th International Conference on Signal Processing and Telecommunication Systems, ICSPCS'2011 5th International Conference on Signal Processing and Communication Systems, ICSPCS'2011 - Proceedings   2011.12

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    Major drawback in orthogonal frequency division multiplexing (OFDM) systems is that the transmit signal exhibits high peak-to-average power ratio (PAPR). In this paper, a phase sequence blind estimation method is presented for PAPR reduction based on a selected mapping (SLM) or a partial transmit sequence (PTS) in multi-input multi-output (MIMO) coded OFDM systems, where low density parity check (LDPC) code is employed. On the receiver side, the selected phase sequence information is estimated using a maximum likelihood method which selects the most likelihood sequence among all candidate sequences by exploiting soft-output information of the decoder. Computer simulation results show that when the number of candidate sequences in SLM is M = 256, instantaneous power of the transmit signal at the CCDF of 10 -6 can be reduced by about 3.9dB as compared to case without PAPR reduction, while almost the same bit error rate (BER) performance as case of the prefect phase sequence estimation is achieved in attenuated 12-path Rayleigh fading condition.

    DOI: 10.1109/ICSPCS.2011.6140821

  • Channel estimation technique for MIMO-constant envelope modulation

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    7th International Wireless Communications and Mobile Computing Conference, IWCMC 2011 IWCMC 2011 - 7th International Wireless Communications and Mobile Computing Conference   1433 - 1440   2011.9

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    The authors have proposed Multi-Input Multi-Output (MIMO)-Constant Envelope Modulation, (MIMO-CEM), as power and complexity efficient alternative to MIMO-OFDM, suitable for wireless backhaul network in which relay nodes are fixed in their positions. One of the major problems to withstand real application of MIMO-CEM is to estimate MIMO channel characteristics. The MIMO-CEM is based upon two contrary schemes; one is the nonlinear CEM modified Maximum Likelihood Sequence Estimator (MLSE) proposed by the authors, which needs accurate channel information to replicate the received signal passing through channel. The other is low resolution analog-to-digital converter (ADC), i.e., 1-bit in the default operation and 2 or 3 bits in the optional operations, which means that the received channel amplitude information may be completely or partially destroyed. These two contrary demands make MIMO-CEM channel estimation a big challenge; how we can accurately estimate the channel in these severe low ADC resolution conditions. We consider this issue through designing an efficient MIMO-CEM channel estimator based upon a block based adaptive filter. In addition, in order to speed up the parameter convergence rate in the proposed adaptive estimator, we design a correlator estimator as initial channel state estimation used in the adaptive estimator. We prove the effectiveness of the proposed MIMO-CEM channel estimation under different channel scenarios and different low ADC resolutions such as 1, 2 and 3-bit.

    DOI: 10.1109/IWCMC.2011.5982749

  • Decision directed channel tracking for MIMO-constant envelope modulation

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    International Conference on Digital Information and Communication Technology and Its Applications, DICTAP 2011 Digital Information and Communication Technology and Its Applications - International Conference, DICTAP 2011, Proceedings   619 - 633   2011.7

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    The authors have proposed Multi-Input Multi-Output (MIMO)-Constant Envelope Modulation, MIMO-CEM, as power and complexity efficient alternative to MIMO-OFDM, suitable for wireless backhaul networks. Because MIMO-CEM receiver employs 1-bit ADC, MIMO-CEM channel estimation is one of the major challenges toward its real application. The authors have proposed adaptive channel estimator in static and quasi-static channel conditions. Although wireless backhaul channel conditions are theoretically considered as static and quasi-static, it suffers from some channel fluctuations in real applications. Hence, the objective of this paper is to present a decision directed channel estimation (DDCE) to track channel fluctuation in high Doppler frequency condition, and clarify the effectiveness of our method under dynamic channel. For the purpose of comparison, the performance of DDCE is compared with that of a pilot assisted linear interpolation channel tracking for MIMO-CEM. Different Doppler frequencies are assumed to prove the effectiveness of the scheme even in high channel variations.

    DOI: 10.1007/978-3-642-21984-9_51

  • Adaptive predistortion linearization based on orthogonal polynomial expansion for nonlinear power amplifiers in OFDM systems

    Osamu Muta, Isamu Kaneko, Yoshihiko Akaiwa, Hiroshi Furukawa

    2011 International Conference on Communications and Signal Processing, ICCSP 2011 ICCSP 2011 - 2011 International Conference on Communications and Signal Processing   512 - 516   2011.4

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    Adaptive predistorter is an effective technique to compensate for nonlinear distortion in a power amplifier. As a method to improve the parameter convergence speed in the predistorter, a series expansion technique with an orthogonal polynomials has been investigated. In this paper, we present an adaptive predistortion linearization method based on orthogonal polynomial expansion for a nonlinear power amplifier affected by memory effect in OFDM systems, where both memory and memoryless predistorter are constructed by the weighted sum of orthogonal polynomials. In addition, to achieve the parameter optimization speed improvement of the predistorter, we propose a method to determine step-size in a recursive calculation. The parameter convergence performance of the predistorter is investigated in OFDM systems with and without peak-to-average power ratio (PAPR) reduction, where the partial transmit sequence (PTS) technique is employed to reduce PAPR. Computer simulation results show that the proposed adaptive predistorter achieves faster parameter convergence time than that of non-orthogonal one in OFDM systems with nonlinear power amplifier affected by memory effect, even though PAPR of OFDM signal is reduced by using PTS. It is also confirmed that power added efficiency is further improved by combining the adaptive predistortion with PAPR reduction technique.

    DOI: 10.1109/ICCSP.2011.5739374

  • Effects of PAPR reduction based on peak limiter in IEEE802.16e based OFDM system Reviewed

    Yu Takase, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   E94-B ( 5 )   1467 - 1471   2011.1

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    A major drawback in OFDM systems is that the transmitsignal exhibits a high Peak-to-Average Power Ratio (PAPR) which causes nonlinear distortion at the output of power amplifier. To achieve high efficiency in OFDM systems, it is important to suppress PAPR of the transmit signal. In IEEE802.16e (mobile WiMAX) based systems, it is desirable to employ a simple PAPR reduction method such as clipping & filtering (C&F) or peak windowing (PW). The purpose of this paper is to evaluate PAPR reduction performance of C&F and PW and compare them in an IEEE802.16e based OFDM system. In addition, we also show a repeated PW method which reduces PAPR by repeatedly applying a smooth window function to the transmit signal. Computer simulation results show that the repeated PW can achieve almost the same PAPR reduction performance as that of the repeated C&F with significantly lower computational complexity.

    DOI: 10.1587/transcom.E94.B.1467

  • Simplified cross-polarized multi-antenna system for radio relay transmission in wireless backhaul

    Issei Ikezaki, Osamu Muta, Hiroshi Furukawa

    2011 International Conference on Communications and Signal Processing, ICCSP 2011 ICCSP 2011 - 2011 International Conference on Communications and Signal Processing   480 - 484   2011

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    Wireless backhaul systems have been considered as a promising candidate of beyond 3G wireless broadband system for mobile communications. The achievable transmission performance over radio relay channel depends on antenna directivity and radiation patterns of each antenna element. To improve the transmission performance and keep radio relay channel in an acceptable condition, it is effective to control the antenna directivity by employing multi-antenna signal transmission and reception. In this paper, we propose a simple method to extend the existing single antenna relay node based on IEEE802.11a to multi-antenna system, where a cross polarized multi-antenna is applied to the existing relay nodes as external equipment. The multi-antenna system is controlled by detecting the antenna control information assigned to the lengths of the packets transmitted from the existing node. The proposed method does not require special change of the existing system such as hardware design on multi-antenna configuration. We also developed a prototype base/relay node with optional multi-antenna equipment and confirmed the effectiveness of the proposed method by experiment. To clarify the effectiveness of the proposed multi-antenna system in wireless backhaul networks, we evaluate throughput performance by system level simulations. Simulation results ensure that the proposed multi-antenna system with highly efficient packet forwarding protocol, called Intermittent Periodic Transmit (IPT), improves throughput performance of the radio relay transmission in wireless backhaul as compared with conventional omni-directional antenna system.

    DOI: 10.1109/ICCSP.2011.5739365

  • Adaptive channel assignment and pilot-less channel tracking method for OFDMA systems

    Kazumitsu Sakamoto, Osamu Muta, Yoshihiko Akaiwa, K. Giridhar, Hiroshi Furukawa

    4th International Conference on Signal Processing and Communication Systems, ICSPCS'2010 4th International Conference on Signal Processing and Communication Systems, ICSPCS'2010 - Proceedings   2010.12

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    OFDMA (Orthogonal frequency division multiple access) based systems have been considered as a candidate for future wireless communication systems. In such a system, it is important to provide high data rate services for users with high mobility. For this purpose, decision-directed channel tracking (DDCT) techniques have been investigated for OFDM systems in high mobility environments. The performance of the DDCT in OFDMA systems depends on the assigned channel condition, and therefore it is important to allocate a proper channel to each user. The purpose of this paper is to propose an adaptive channel assignment method which enhances the DDCT improvement in an OFDMA system, where the former numbered resource blocks (RBs) in OFDMA frame are preferentially allocated to the users moving at a high speed. Computer simulation results show that the proposed method is effective in improving throughput performance of OFDMA systems in a high Doppler frequency condition.

    DOI: 10.1109/ICSPCS.2010.5709724

  • Construction and blind estimation of phase sequences for subcarrier-phase control based PAPR reduction in LDPC coded OFDM systems Reviewed

    Osamu Muta

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E93-A ( 11 )   2130 - 2140   2010.1

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    As described in this paper, construction and blind estimation methods of phase sequences are proposed for subcarrier-phase control based peak-to-average power ratio (PAPR) reduction in low-density paritycheck (LDPC)-coded orthogonal frequency division multiplexing (OFDM) systems. On the transmitter side, phase sequence patterns are constructed based on a given parity-check matrix. The PAPR of the OFDM signal is reduced by multiplying the constructed phase sequence selected from the same number of candidates as the number of weighting factor (WF) combinations in a partial transmit sequence (PTS) method. On the receiver side, the phase sequence is estimated blindly using the decoding function, i.e., the most likely phase sequence among a limited number of possible phase sequence candidates is inferred by comparing the sum-product calculation results of each candidate. Computer simulation results show that PAPR of QPSK-OFDM and 16QAM-OFDM signals can be reduced respectively by about 3.7 dB and 4.0 dB without marked degradation of the block error rate (BLER) performance as compared to perfect estimation in an attenuated 12-path Rayleigh fading condition.

    DOI: 10.1587/transfun.E93.A.2130

  • A subcarrier-phase control based PAPR reduction scheme without side-information transmission in LDPC coded OFDM systems

    Osamu Muta

    2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009 2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009   2009.12

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    In this paper, a subcarrier-phase control based peak-to-average power (PAPR) reduction scheme without side-information transmission is proposed for LDPC coded OFDM systems. On the transmitter side, peak power of OFDM signal is reduced by multiplying the selected phase-sequence. On the receiver side, the phase sequence used for PAPR reduction is estimated without side information by utilizing the decoding property of LDPC code, i.e., based on the decoding information in single iteration sum-product calculation, limited number of candidate sequences is selected from all possible phase sequence patterns and the correct phase-sequence can be estimated by comparing the decoding results corresponding to these selected candidate sequences. Computer simulation results show that, when LDPC code with code-rate of R ≈ 1/2 is used, PAPR of OFDM signal can be reduced by about 2.4dB without significant degradation in BLER performance as compared to perfect WF estimation in attenuated 12-path Rayleigh fading condition.

    DOI: 10.1109/PIMRC.2009.5450116

  • A high-speed power-line communication system with band-limited OQAM based multi-carrier transmission Reviewed

    Naohiro Kawabata, Hisao Koga, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   E92-B ( 2 )   473 - 482   2009.1

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    As a method to realize a high-speed communication in the home network, the power-line communication (PLC) technique is known. A problem of PLC is that leakage radiation interferes with existing systems. When OFDM is used in a PLC system, the leakage radiation is not sufficiently reduced, even if the subcarriers corresponding to the frequencyband of the existing system are never used, because the signal is not strictly band-limited. To solve this problem, each subcarrier must be bandlimited. In this paper, we apply the OQAM based multi-carrier transmission (OQAM-MCT) to a high-speed PLC system, where each subcarrier is individually band-limited. We also propose a pilot-symbol sequence suitable for frequency offset estimation, symbol-timing detection and channel estimation in the OQAM-MCT system. In this method, the pilot signalsequence consists of a repeated series of the same data symbol. With this method, the pilot sequence approximately becomes equivalent to OFDM sequence and therefore existing pilot-assisted methods for OFDM are also applicable to OQAM-MCT system. Computer simulation results show that the OQAM-MCT system achieves both good transmission rate performance and low out-of-band radiation in PLC channels. It is also shown that the proposed pilot-sequence improves frequency offset estimation, symboltiming detection and channel estimation performance as compared with the case of using pseudo-noise sequence.

    DOI: 10.1587/transcom.E92.B.473

  • Iterative joint optimization of transmit/receive frequency-domain equalization in single carrier wireless communication systems

    Yuan Xiaogeng, Osamu Muta, Yoshihiko Akaiwa

    68th Semi-Annual IEEE Vehicular Technology, VTC 2008-Fall, Conference The 68th IEEE Vehicular Technology Conference, VTC 2008-Fall   2008.12

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    An iterative optimization method of transmit/receive frequency domain equalization (FDE) is proposed for single carrier transmission systems, where both transmit and receive FDE weights are iteratively determined with a recursive algorithm so as to minimize the error signal at a virtual receiver. The computer simulation results show that SC systems using the proposed transmit/receive equalization method achieves better BER performance than those using the conventional receive FDE. BER performance of SC systems using the proposed method was improved by about 2.7dB at BER=10-3 compared to case of those using conventional receive FDE in attenuated 6-path quasistatic Rayleigh fading with normalized delay spread value of τ/T = 0.769. In addition, when decision feedback equalizer (DFE) with sufficient number of feedback taps is adopted in both systems, the proposed system achieves better BER performance than the conventional system in a low Eb/N region and BER performance of the proposed system becomes close to that of the conventional one as Eb/N0 increases in the above channel condition.

    DOI: 10.1109/VETECF.2008.200

  • Weighting factor estimation method for peak power reduction based on adaptive flipping of parity bits in turbo-coded OFDM systems Reviewed

    Osamu Muta, Yoshihiko Akaiwa

    IEEE Transactions on Vehicular Technology   57 ( 6 )   3551 - 3562   2008.12

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    In this paper, we propose a weighting factor (WF) estimation method for peak power reduction (PPR) based on adaptive flipping of parity carriers in a turbo-coded orthogonal frequency-division multiplexing (OFDM) system. In this PPR scheme, the peak-to-average power ratio of a turbo-coded OFDM signal is reduced with adaptive flipping of the phase of the parity carriers corresponding to the WFs. At the receiver, the WFs are estimated at a turbo decoder by exploiting the redundancy of an error-correcting code using no extra side information. The proposed WF estimation method is based on an iterative decoding of the turbo code, i.e., the turbo decoder provides not only error correction capability but the WF estimation function as well. When the proposed WF estimation method is used for the system using a turbo code with constraint length K = 4 and a code rate of R = 1/2, the instantaneous power of the OFDM signal at the complementary cumulative distribution function of 10-4 can be reduced by about 2.1 dB through the application of the PPR scheme. When the bit error rate (BER) performance is evaluated as a function of the peak signal-to-noise power ratio (PSNR), the proposed method achieves better BER performance than the case without the PPR in an attenuated 12-path Rayleigh fading condition. The improvements in BER performance as a function of PSNR are about 1.1, 2.0, and 2.1 dB at BER = 10-4 for turbo-coded OFDM signals using QPSK, 16-state quadrature amplitude modulation (QAM), and 64-state QAM schemes, respectively.

    DOI: 10.1109/TVT.2008.918729

  • Iterative weighting factor estimation method for peak power reduction with adaptive subcarrier-phase control in turbo-coded multi-carrier CDM systems

    Osamu Muta, Yoshihiko Akaiwa

    68th Semi-Annual IEEE Vehicular Technology, VTC 2008-Fall, Conference The 68th IEEE Vehicular Technology Conference, VTC 2008-Fall   2008.12

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    In this paper, we propose a weighting factor (WF) iterative estimation method for a turbo-coded multi-carrier code division multiplexing (MC-CDM) system using partial-transmit sequence (PTS) based peak-to-average power (PAPR) reduction, where the transmitter structure in the proposed system is an extended version of the PTS and the systematic bits of turbo-code is adaptively flipped by multiplying WFs so as to reduce PAPR of MC-CDM signal. On the receiver side, WF estimation and error correction are jointly performed with turbo decoding, where WFs are estimated by exploiting the decoding results of two data streams using different spreading code. When PTS like PAPR reduction using 9 clusters is applied to MC-CDM signal with spreading factor of 16, PAPR of the transmit signal at the CCDF of 10-4 can be reduced by about 2.0dB, where the number of multiplexed codes is 8. With the proposed method, WF estimation accuracy is improved as the subcarrier modulation level increases. The degradation in block error rate (BLER) performance as compared with case of the perfect WF estimation is about 0.7dB at BLER=10-2 for QPSK-MC-CDM signal with PAPR reduction using 5 clusters in attenuated 12-path Rayleigh fading condition. In the MC-CDM system using 64QAM, the proposed method achieves almost the same BLER performance as case of the perfect WF estimation, even when the number of clusters is L = 9.

    DOI: 10.1109/VETECF.2008.201

  • Joint use of adaptive equalization and cyclic noise cancellation for band-limited OQAM based multi-carrier transmission in power-line communication systems Reviewed

    Hiromitsu Kunishima, Hisao Koga, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E91-A ( 11 )   3112 - 3120   2008.11

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    Power-line communication (PLC) technique is one method to realize high-speed communications in a home network. In PLC channels, the transmission signal quality is degraded by colored non-Gaussian noise as well as frequency-selectivity of the channels. In this paper, we describe our investigation of the performance of a OQAM-MCT system in which a noise canceller is used jointly with a time-domain persubcarrier adaptive equalizer. Furthermore, we propose a noise cancellation method designed for the OQAM-MCT system. The performance of the OQAM-MCT system is evaluated in PLC channels with measured impulse responses in the presence of measured noise. Computer simulation results show that the bit rate of the OQAM-MCT system is improved using both an adaptive equalizer and noise canceller, and that the OQAM-MCT system achieves better performance than an OFDM system with an insufficient length of the guard interval.

    DOI: 10.1093/ietfec/e91-a.11.3112

  • Joint use of adaptive equalization and cyclic noise cancellation for band-limited OQAM based multi-carrier transmission in power-line communication systems

    Hiromitsu Kunishima, Hisao Koga, Osamu Muta, Yoshihiko Akaiwa

    2008 IEEE International Symposium on Power Line Communications and Its Applications, IEEE ISPLC 2008 IEEE ISPLC 2008 - 2008 IEEE International Symposium on Power Line Communications and Its Applications   380 - 385   2008.9

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    As a method to realize a high-speed communication in home network, the power-line communication (PLC) technique is known. In PLC channels, transmission signal quality is degraded by colored non-Gaussian noise with uncommon characteristics as well as frequency-selectivity of channels. In this paper, we investigate the performance of the OQAM-MCT system with a small number of subcarriers where noise canceller is jointly used with time-domain per-subcarrier adaptive equalizer. In addition, we propose a modified noise cancellation method designed for OQAM-MCT system. The performance of the OQAM-MCT system is evaluated in PLC channels with measured impulse responses in presence of measured noise. Computer simulation results show that transmission rate of the OQAM-MCT system is improved by using both adaptive equalizer and noise canceller and also the OQAMMCT system achieves better performance than OFDM system with insufficient length of guard interval.

    DOI: 10.1109/ISPLC.2008.4510458

  • A least mean square based algorithm to determine transmit and receive weights for eigenbeam MIMO systems

    Takayuki Tominaga, Osamu Muta, Yoshihiko Akaiwa

    2008 IEEE 67th Vehicular Technology Conference-Spring, VTC 2008 IEEE 67th Vehicular Technology Conference-Spring, VTC   782 - 786   2008.7

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    MIMO system is a technology to realize high data rates and high capacity. Among various MIMO systems, Eigenbeam MIMO (E-MIMO) system achieves the theoretical maximum capacity. The E-MIMO system uses eigenvectors of channel autocorrelation matrix as transmit and receive weights. As a method to find these eigenvectors, eigenvalue decomposition or singular value decomposition (SVD) are generally well-known. In this paper, we propose a least mean square (LMS) based algorithm to find the transmit and receive weights without significant increase of computational complexity for E-MIMO system. Computer simulation shows that the proposed algorithm gives almost the same performance as that of SVD.

    DOI: 10.1109/VETECS.2008.171

  • On the effect of time-domain per-subcarrier equalization for band-limited OQAM based Multi-Carrier Modulation systems

    Hiromitsu Kunishima, Hisao Koga, Osamu Muta, Yoshihiko Akaiwa

    2008 IEEE 67th Vehicular Technology Conference-Spring, VTC 2008 IEEE 67th Vehicular Technology Conference-Spring, VTC   380 - 384   2008.7

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    As a method to realize an orthogonal multicarrier transmission, Offset Quadrature Amplitude Modulation based Multi-Carrier Modulation (OQAM-MCM) has been known, where each subcarrier is strictly band-limited by a filter. Objective of this paper is to discuss the use of OQAM-MCM system instead of Orthogonal Frequency Division Multiplexing (OFDM) system as a countermeasure against frequency-selective fading. We investigate the performance of OQAM-MCM system with a small number of subcarriers employing a simplified time-domain per-subcarrier equalizer. Computer simulation results show that OQAM-MCM system can achieve both better spectrum efficiency and lower Bit Error Rate (BER) performance than those of OFDM systems with insufficient Guard Interval (GI), when a time-domain per-subcarrier equalizer is used in both systems.

    DOI: 10.1109/VETECS.2008.91

  • A nonlinear distortion compensation method with adaptive predistorter and negative feed-back for a narrow-band signal Reviewed

    Yitao Zhang, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   E91-B ( 7 )   2331 - 2337   2008.1

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    The adaptive predistorter and the negative feedback system are known as methods to compensate for the nonlinear distortion of a power amplifier. Although the feedback method is a simple technique, its instability impedes the capability of high-feedback gain to achieve a highcompensation effect. On the other hand, the predistorter requires a long time for convergence of the adaptive predistorters. In this paper, we propose a nonlinear distortion compensation method for a narrow-band signal. In this method, an adaptive predistorter and negative feedback are combined. In addition, to shorten the convergence time to minimize nonlinear distortion, a variable step-size (VS) method is also applied to the algorithm to determine the parameters of the adaptive predistorter. Using computer simulations, we show that the proposed scheme achieves both five times faster convergence speed than that of the predistorter and three times higher permissible delay time in the feedback amplifier than that of a negative feedback only amplifier.

    DOI: 10.1093/ietcom/e91-b.7.2331

  • A peak power reduction method with adaptive inversion of clustered parity-carriers in BCH-Coded OFDM systems Reviewed

    Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   E91-B ( 5 )   1454 - 1462   2008

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    In this paper, we propose a simple peak power reduction (PPR) method based on adaptive inversion of parity-check block of codeword in BCH-coded OFDM system. In the proposed method, the entire parity-check block of the codeword is adaptively inversed by multiplying weighting factors (WFs) so as to minimize PAPR of the OFDM signal, symbol-by-symbol. At the receiver, these WFs are estimated based on the property of BCH decoding. When the primitive BCH code with single error correction such as (31,26) code is used, to estimate the WFs, the proposed method employs a significant bit protection method which assigns a significant bit to the best subcarrier selected among all possible subcarriers. With computer simulation, when (31,26), (31,21 ) and (32,21 ) BCH codes are employed, PAPR of the OFDM signal at the CCDF (Complementary Cumulative Distribution Function) of 10-4 is reduced by about 1.9, 2.5 and 2.5 dB by applying the PPR method, while achieving the BER performance comparable to the case with the perfect WF estimation in exponentially decaying 12-path Rayleigh fading condition

    DOI: 10.1093/ietcom/e91-b.5.1454

  • Adaptive Guard Symbol Insertion Method for One-Cell Reuse TDMA Cellular Systems Reviewed International journal

    Seiichiro Horikawa, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   2007.12

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    Seiichiro Horikawa, Osamu Muta, Yoshihiko Akaiwa, ``Adaptive Guard Symbol Insertion Method for One-Cell Reuse TDMA Cellular Systems,'' IEICE Transactions on Communications, Vol.E90-B, No.12, pp.3724-3728, Dec. 2007.

  • An adaptive predistortion method based on orthogonal polynomial expansion for nonlinear distortion compensation

    Seiji Ohmori, Xu Guangsheng, Osamu Muta, Yoshihiko Akaiwa

    18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'07 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'07   2007.12

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    Adaptive predistorter is an effective technique to compensate nonlinear distortion in a power amplifier. As a method to improve the parameter convergence speed in the predistorter, a series expansion technique with an orthogonal polynomials has been proposed. In this paper, we propose an adaptive predistorter based on orthogonal polynomial for the power amplifier with memory effect, where the parameters of predistorter are determined so as to minimize out-of-band radiation components detected by high pass filter (HPF). With computer simulation using the Advanced Design System (ADS) software, we show that the adaptive predisterter using orthogonal polynomials achieves faster convergence time than that with that of non-orthogonal one, while nonlinear distortion is compensated by memory predistorter using orthogonal polynomials.

    DOI: 10.1109/PIMRC.2007.4394716

  • Peak power reduction method based on structure of parity-check matrix for LDPC coded OFDM transmission

    Osamu Muta, Yoshihiko Akaiwa

    2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring   2841 - 2845   2007.8

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    In this paper, we propose a peak power reduction method for LDPC coded OFDM system, where transmit data sequence is grouped into several clusters based on structure of a low density parity-check matrix and the phase of each cluster is adjusted so as to minimize PAPR of OFDM signal by multiplying weighting factors (WFs). At the receiver, WFs are estimated with sufficient accuracy by exploiting the decoding property of LDPC code. The proposed method can be applied to not only systematic coded signal but also non-systematic one. Computer simulation results show that, when LDPC code with code-rate of R ≈ 1/2 is used, PAPR of OFDM signal can be reduced by about 2.4dB without significant degradation in BLER performance as compared to perfect WF estimation in attenuated 12-path Rayleigh fading condition.

    DOI: 10.1109/VETECS.2007.583

  • Adaptive guard symbol insertion method for one-cell reuse TDMA cellular systems Reviewed

    Seiichiro Horikawa, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications   E90-B ( 12 )   3724 - 3728   2007.1

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    In this paper, we propose an adaptive guard symbol insertion method for one-cell reuse TDMA cellular systems in which cochannel interference is reduced by adaptively selecting the best transmitpulse waveform with different guard (null-) symbols according to the average error power (AEP) corresponding to signal-to-interference and noise power ratio (SINR), even though the same frequency channel is used at all base stations. Using the proposed system, current TDMA-based systems are readily extensible to one-cell reuse systems, which achieves higher spectrum efficiency. The system capacity is enhanced using the proposed method; moreover, the required qualities such as blocking probability and outage probability are retained.

    DOI: 10.1093/ietcom/e90-b.12.3724

  • A high-speed power-line communication system with band-limited OQAM based multi-carrier transmission

    Naohiro Kawabata, Hisao Koga, Osamu Muta, Yoshihiko Akaiwa

    2007 IEEE International Symposium on Power Line Communications and Its Applications, ISPLC'07 2007 IEEE International Symposium on Power Line Communications and Its Applications, ISPLC'07   290 - 295   2007

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    As a method to realize a high-speed communication in home network, the power-line communication (PLC) technique is known. A problem of the PLC is that leakage radiation interferes to existing systems. When OFDM is used in PLC system, the leakage radiation is not sufficiently reduced, even if the subcarriers corresponding to frequency-band of the existing system are never used, because the signal is not strictly band-limited. To solve this problem, each subcarrier must be band-limited. In this paper, we apply the OQAM based multi-carrier transmission (OQAM-MCT) to high-speed PLC system, where each subcarrier is individually band-limited. We also propose a pilot-symbol sequence for frequency offset estimation, symbol-timing detection and channel estimation in the OQAM-MCT system. In this method, the pilot signal-sequence consists of the succession of the same data symbol. Computer simulation results show that the OQAM-MCT system achieves both good transmission rate performance and low out-of-band radiation in the PLC channels. It is also shown that the proposed pilot-sequence improves frequency offset estimation, symbol-timing detection and channel estimation performance as compared with the case of using pseudo-noise sequence.

    DOI: 10.1109/ISPLC.2007.371139

  • A nonlinear distortion compensation method with adaptive predistorter and negative feed-back for a narrow-band signal

    Yitao Zhang, Osamu Muta, Yoshihiko Akaiwa

    2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall   2931 - 2935   2006.12

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    As a method to compensate for the nonlinear distortion of a power amplifier, the adaptive predistorter and the negative feed-back system are known. Although the feed-back method is a simple technique, its instability becomes a problem for a high feedback gain to achieve a high compensation effect. On the other hand, the predistorter needs long time to calculate the suitable parameters. In this paper, we propose a nonlinear distortion compensation method for a narrow-band signal. In this method, adaptive predistorter and negative feedback are combined. With computer simulations, we show that the proposed scheme achieves both five times faster convergence speed than that of the predistorter and three times longer permissible delay time in the feed-back amplifier than that of a negative feed-back only amplifier, while keeping the required compensation performance.

    DOI: 10.1109/VTCF.2006.603

  • A weighting factor estimation scheme for phase-control based peak power reduction of turbo-coded OFDM signal

    Osamu Muta, Yoshihiko Akaiwa

    2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring 2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring - Proceedings   1477 - 1481   2006.12

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    In this paper, we propose a weighting factor (WF) estimation scheme for phase-control based peak power reduction (PPR) of turbo-coded OFDM signal. In this PPR scheme, the peak power of OFDM signal is reduced by adjusting the phase of parity-carriers by multiplying WFs. At the receiver, WFs are estimated at turbo-decoder without using any side-information. The proposed WF estimation scheme is based on an iterative decoding of turbo-code, i.e. the turbo decoder provides not only error correction capability but also WF estimation function. When a turbo-code of the constraint length of K = 4 and the code rate of R = 1/2 is employed, PAPR of OFDM signal at the CCDF of 10-4 can be reduced by about 2.1dB by applying the PPR scheme. The proposed scheme achieves good BER performance comparable to the case of perfect WF estimation in attenuated 12-path Rayleigh fading condition. The degradation in BER performance is about 1.0dB, 0.4dB and 0.2dB at BER=10-4 for turbo-coded OFDM signals using QPSK, 16QAM and 64QAM, respectively.

  • A peak power reduction method with reduced inter-signal interference for OFCDM signal

    Naoki Aizawa, Osamu Muta, Yoshihiko Akaiwa

    2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall   796 - 800   2006.12

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    A problem with the OFCDM (Orthogonal Frequency and Code Division Multiplexing) system is that PA PR (Peak to Average Power Ratio) of the signal becomes high. In this paper, we propose a novel peak reduction method which suppresses the inter-signal interference caused by peak power limitation for OFCDM signal. In the proposed method, peak power is reduced by adding the peak reducing signal generated with peak components detected by soft-clipping function. At the receiver, the inter-signal interference is compensated by estimating the peak components removed at the transmitter from the received signal. Performance of a total system including modulation, peak-limiter, predistorter, a model of 2GHz class A/B power amplifier and the receiver is investigated by computer simulation. Computer simulation results show the peak power reduction performance is improved about 1.4dB as compared with that of the conventional PRSA (peak reducing signal addition) method.

    DOI: 10.1109/VTCF.2006.172

  • A one-cell reuse TDMA cellular system with adaptive guard interval control

    Seiichiro Horikawa, Osamu Muta, Yoshihiko Akaiwa

    62nd Vehicular Technology Conference, VTC 2005 VTC 2005-Fall Mid Way Through the Decade - Technology Past, Present and Future   2007 - 2010   2005.1

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    In a current TDMA cellular system, the same frequency channel is reused at separated cells to avoid co-channel interference from other cells. From the view point of the spectrum efficiency, one-cell reuse system where all base stations use the same frequency channel is desirable. However, in such a system, co-channel interference severely degrades BER performance, in addition to the degradation caused by signal distortion due to frequency-selective fading. In this paper, we propose a one-cell reuse TDMA cellular system, where co-channel interference is reduced by adaptively controlling the duration of guard time according to signal to interference and noise ratio (SINR), while the same frequency channel is used at all base-stations. With the proposed system, a current TDMA system is easily extended to one-cell reuse system which achieves higher spectrum efficiency. The system capacity is enhanced with the proposed scheme, while the required qualities such as blocking rate and outage rate are kept.

    DOI: 10.1109/VETECF.2005.1558460

  • Effect of peak power suppression and adaptive predistortion on power amplification of an OFCDM signal Reviewed

    Naoki Aizawa, Osamu Muta, Yoshihiko Akaiwa, Mamoru Sawahashi

    Unknown Journal   61 ( 3 )   1783 - 1787   2005

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    The OFCDM (Orthogonal Frequency and Code Division Multiplexing) system is receiving attention to achieve a high data rate transmission for multimedia communication. A problem with the system is that PAPR (Peak to Average Power Ratio) of the OFCDM signal increases as the number of carriers increases. In this paper, we investigate peak reducing methods for OFCDM system with a predistorter power amplifier. We show that the peak reduction scheme and adaptive predistortion gives a high power efficiency and high linearity in power amplification of OFCDM signal.

  • A peak power reduction scheme based on reversal of parity-bits for a block-coded OFDM signal Reviewed

    Osamu Muta, Yoshihiko Akaiwa

    2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World IEEE Vehicular Technology Conference   59 ( 4 )   1911 - 1915   2004.12

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    In this paper, we propose a peak power reduction (PPR) scheme based on reversal of parity-bits for a block-coded OFDM signal. In our PPR scheme, the entire parity-check block of codeword is adaptively reversed symbol-by-symbol, so as to minimize PAPR of the OFDM-signal. At the receiver, the original codeword can be restored with sufficient accuracy by checking the Syndrome of received codeword and protecting a significant-bit of code-word from transmission error. When (7,4), (31,21) and (31,26) BCH code are employed, PAPR of the OFDM signal at the CCDF (Complementary Cumulative Distribution Function) of 10-4 can be reduced by about 2.8, 2.5 and 2.0dB by applying PPR scheme while achieving approximately the same BER performance as the case without PPR in exponentially decaying 6-path Rayleigh fading condition.

  • A peak power reduction scheme with phase-control of clustered parity-carriers for a systematic block-coded OFDM signal Reviewed

    Osamu Muta, Yoshihiko Akaiwa

    2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall IEEE Vehicular Technology Conference   58 ( 1 )   562 - 566   2003.12

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    In this paper, we propose a peak-power-reduction (PPR) scheme for a systematic block-coded OFDM signal. In this scheme, peak power of OFDM signal is reduced by adjusting the phase of cluster, which contains only parity-carriers, so as to minimize the peak-to-average power ratio (PAPR) at the transmitter. At the receiver, original signal of parity-carrier is replicated using decided-value of receive data-carriers corresponding to data-bits of code-word. Thus, phase rotation value of the cluster is estimated by comparing the receive signal of parity-carrier and its replica. A reduction of about 2.5dB in peak power and approximately the same BER performance as the case of the ideal decoding are achieved by applying the PPR scheme to an OFDM system with 126 subcarriers in multipath fading condition.

  • Peak-power-reduction scheme with adaptive transmit power control for multicarrier transmission Reviewed

    Osamu Muta, Yoshihiko Akaiwa

    Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)   85 ( 5 )   71 - 78   2002.2

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    We propose a peak-power-reduction (PPR) scheme that never sacrifices spectrum efficiency for a multicarrier transmission (MCT) system where subchannels are band-limited by filtering before the multiplexing. In this scheme, the transmit pulse power before filtering is decreased whenever the envelope peak amplitude is above a given threshold level. A reduction of 75% in peak power is achieved with a slight degradation in BER performance by applying the PPR scheme to an MCT system with eight subchannels under flat fading conditions. The proposed scheme is also investigated with an adaptive transmit power control, and the average transmit power and peak-to-mean power ratio (PMPR) are reduced.

    DOI: 10.1002/ecja.1098

  • A channel estimation scheme with co-phased pilot-signals for multi-carrier modulation Reviewed

    Yoshimasa Egashira, Osamu Muta, Yoshihiko Akaiwa

    55th Vehicular Technology Conference IEEE Vehicular Technology Conference   3   1374 - 1378   2002.1

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    In this paper, we propose a frequency-domain channel estimation scheme using co-phased pilot-signals for a multi-carrier modulation (MCM) system with bandlimited subcarriers: pilot signals are inserted periodically in each subcarrier and are added up (multiplexed) to be in-phase at the midpoint of the pilot-symbol duration at the transmitter. Then, the multiplexed pilot signal exhibits a sharp peak amplitude at the midpoint of the pilot-symbol duration. Thus, the channel characteristics can be estimated with a high time resolution of the pilot signal. We evaluated the performance of an MCM system with a frequency-domain equalizer using the proposed scheme by computer simulation. The BER performance was improved with the channel estimation scheme.

  • A peak power reduction scheme with parity carrier for multicarrier modulation Reviewed

    Osamu Muta, Tatsuhiko Takata, Yoshihiko Akaiwa

    Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)   85 ( 8 )   34 - 46   2002

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    This paper proposes a method which reduces the peak-to-mean power ratio (PMPR) of the multicarrier modulation signal by providing a subcarrier for peak power reduction outside the information band. The proposed method includes the addition of a redundant signal, that is, parity carrier, in order to reduce the peak power of the multicarrier signal when its envelope exceeds a given threshold. The parity carrier for peak power reduction is placed outside the band of the multicarrier signal and can be easily removed in the receiver. It is shown by a computer simulation that when two carriers for peak power reduction are added to the multicarrier signal with eight carriers, the PMPR after the peak power reduction approaches 4.7 dB. It is also shown for the case in which the power amplifier has little nonlinearity that an outband spectrum density of -50 dB can be achieved by applying the proposed method for a back-off of 4.7 dB.

    DOI: 10.1002/ecja.1116

  • A pilot-signal assisted channel estimation scheme for multi-carrier modulation Reviewed

    Osamu Muta, Y. Akaiwa

    IEEE VTS 53rd Vehicular Technology Conference (VTS SPRING 2001) IEEE Vehicular Technology Conference   1 ( 53ND )   683 - 687   2001.1

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    In this paper, we propose a pilot-signal assisted channel estimation (PSCE) scheme for a multi-carrier modulation (MCM) system where a pilot signal bandwidth is restricted in the subcarrier. In this scheme, at the receiver, the pilot signals of each subcarrier are added up to be inphase at midpoint of pilot-symbol duration, then pilot signal exhibits sharp peak amplitude. Thus channel impulse response can be estimated with a high time-resolution. A simple channel equalization is done using the estimated channel characteristic and BER performance is improved by applying the PSCE scheme to an MCM system under Rayleigh two-path fading condition.

  • Peak power suppression with parity carrier for multi-carrier transmission Reviewed

    Tatsuhiko Takada, Osamu Muta, Yoshihiko Akaiwa

    Proceedings of the 1999 VTC - Fall IEEE VTS 50th Vehicular Technology Conference 'Gateway to 21st Century Communications Village' IEEE Vehicular Technology Conference   5   2903 - 2907   1999.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    A major disadvantage of multi-carrier transmission (MCT) is increase of peak power. In this paper, we propose a peak power suppression scheme for MCT system based on generating peak power suppressing signals at extra carrier (parity carrier). This scheme has an advantage that it can be applied to any MCT system and the suppressing signal can be easily spilt at the demodulator. In the case of 8 subcarriers, peak power can be reduced by about 5 dB by the proposed scheme. When nonlinearity of the power amplifier is small, out-of-band radiation is decreased to -50 dB below the in-band spectral with this scheme.

  • Adaptive channel selection in frequency-selective fading environment

    O. Muta, Y. Akaiwa

    1999 IEEE International Conference on Communications, ICC 1999 1999 IEEE International Conference on Communications, ICC 1999   1846 - 1851   1999.1

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    Language:English   Publishing type:Research paper (other academic)  

    This paper proposes an adaptive channel selection method that reduces signal distortion due to frequency selective fading and thereby improving the performance of mobile communication. In this method a channel is adaptively selected by estimating current channel condition with mean square decision error as a measure. This selected frequency channel corresponds to the channel in which the delayed signals add-up inphase. Hence, BER performance is improved with the proposed scheme. Computer simulation results show the effectiveness of the proposed scheme for a system with multiple terminals and also for a multiple base station (cellular) system.

    DOI: 10.1109/ICC.1999.765582

  • Peak power reduction scheme with adaptive transmit power control for multi-carrier transmission

    Osamu Muta, Yoshihiko Akaiwa

    IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall   3   2144 - 2148   1999

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    In this paper, we propose a peak-power-suppression (PPS) scheme for a multi carrier transmission (MCT) system where subchannels are band-limited by filtering before the multiplexer. In this scheme, transmit pulse power before filtering is decreased whenever envelope-peak amplitude is above a given threshold level. A reduction of 75% in peak power is achieved with a little, but insignificant, degradation in BER performance by applying the PPS scheme to an MCT system with 8 subchannels under flat fading conditions. The proposed scheme is also investigated with an adaptive transmit power control, and average transmit power and peak-to-mean power ratio (PMPR) are reduced.

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Presentations

  • Peak-amplitude-aware Precoded MIMO Systems Invited

    Osamu Muta

    IEICE Information and Communication Technology Forum 2015  2015.6 

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    Event date: 2015.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Manchester   Country:United Kingdom  

  • 適応ピークキャンセラを用いたMIMO-OFDM信号のピーク電力低減に関する検討(3)

    景山 知哉, 大木 雄介, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 通信方式研究会  2015.2 

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    Event date: 2015.2

    Language:Others   Presentation type:Oral presentation (general)  

    Venue:鳥取大学   Country:Japan  

  • Linearity Enhancement Technique for one bit A/D converter in wireless communication devices Invited International conference

    Daisuke Kanemoto, Muta Osamu, Hiroshi Furukawa

    International Symposium on Consumer Electronics 2014 (ISCE2014)  2014.6 

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    Event date: 2014.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Jeju   Country:Korea, Republic of  

    Linearity Enhancement Technique for one bit A/D converter in wireless communication devices

    Other Link: http://www.isce2014.org/

  • Introduction of Research Activities on Wireless Communications in EJUST Center Invited International conference

    Muta Osamu

    IEICE Information and Communication Technology Forum 2014  2014.5 

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    Event date: 2014.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Poznan   Country:Poland  

    Introduction of Research Activities on Wireless Communications in EJUST Center

    Other Link: http://www.ictf2014.org/index.php?id=59&layout=2&auth_code=65e9307e27ef764a7815a5f10a941c2e

  • A Novel Idea of One Bit Resolution ADC for Small Analog Hardware Wireless Receivers International conference

    Daisuke Kanemoto, Muta Osamu, Furukawa Hiroshi, Takahide Sato, Makoto Ohki

    IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XVII)  2014.4 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Yokohama   Country:Japan  

    A Novel Idea of One Bit Resolution ADC for Small Analog Hardware Wireless Receivers

  • PAPR Reduction and Related Techniques for Power Efficient Multi-Carrier/Multi-Code Communication Systems Invited International conference

    Muta Osamu

    IEICE Information and Communication Technology Forum 2013  2013.5 

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    Event date: 2013.5 - 2012.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sarajevo   Country:Bosnia and Herzegovina  

    PAPR Reduction and Related Techniques for Power Efficient Multi-Carrier/Multi-Code Communication Systems

    Other Link: http://www.ieice-europe.org/ictf/

  • 無線LANのCSIを利用した物体検知方式の屋内外での特性評価

    清水俊亮, 國廣風馬, 牟田 修, 村上 友規, 大槻 信也, 大谷 花絵

    電子情報通信学会 総合大会  2025.3 

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    Event date: 2025.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Battery-Aware UAV Course Plotting and NOMA Resource Management

    Ahmad Gendia, Osamu Muta

    電子情報通信学会 総合大会  2025.3 

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    Event date: 2025.3

    Language:English   Presentation type:Oral presentation (general)  

  • Performance of RSS-Based Indoor Cooperative Positioning with Weighted User-Terminal Collaboration International conference

    Zhuoran Li, Osamu Muta, Yutaka Jitsumatsu

    International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC) 2024  2024.12 

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    Event date: 2024.12

    Language:English   Presentation type:Oral presentation (general)  

  • Experimental Evaluation of RSS-based Indoor Positioning Using 920MHz-band LoRa Signals International conference

    Osamu Muta, Takuto Watanabe, Naohiro Ikeda

    7th International Workshop on Smart Wireless Communications (SmartCom2024)  電子情報通信学会

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    Event date: 2024.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:RWTH Aachen University   Country:Germany  

  • An Improved Peak Cancellation Scheme for Massive MIMO-OFDM with Uniform Planar Array International conference

    Mirena Omoto, Zhuoran Li, Osamu Muta, Kazuki Maruta

    7th International Workshop on Smart Wireless Communications (SmartCom2024)  電子情報通信学会

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    Event date: 2024.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:RWTH Aachen University   Country:Germany  

  • 屋外および屋内広域環境における無線LANのCSIを利用した物体検知特性の実験評価

    清水俊亮, 牟田修, 村上友規, 大槻信也, 大谷花絵

    電子情報通信学会 革新的無線通信技術に関する横断型研究会(MIKA)2024  電子情報通信学会

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    Event date: 2024.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター   Country:Japan  

  • Self-Supervised Zero-Shot Noise2Noise Framework for Improved Channel Estimation in RIS-Aided Multi-user Systems International coauthorship International conference

    Justine M Mdali, Mohammed Abo-Zahhad, Ahmed Hassan Abd El-Malek, Osamu Muta, Maha Elsabrouty

    The 20th International Conference on Wireless and Mobile Computing, Networking and Communications 

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    Event date: 2024.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Paris   Country:France  

    Other Link: http://www.wimob.org/wimob2024/

  • 建設現場における三次元測位に向けた920MHz帯LoRaWANを用いる平面位置推定の検討と実験評価

    中野恭輔, 牟田 修, 渡辺拓人, 池田直広

    電子情報通信学会 無線通信システム研究会  2024.10  電子情報通信学会

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    Event date: 2024.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:電気通信大学   Country:Japan  

  • Experimental Evaluation of WLAN-based Object Detection Using CSI in Outdoor and Large-scale Indoor Environments International conference

    Shunsuke Shimizu, Osamu Muta, Shinya Otsuki, Tomoki Murakami, Hanae Otani

    IEEE Vehicular Technology Conference Fall 2024  IEEE

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    Event date: 2024.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington DC   Country:United States  

  • Deep Reinforcement Learning Based Computing Resource Allocation in Fog Radio Access Networks International coauthorship International conference

    Tong Zhaowei, Zhuoran Li, Ahmad Gendia, Osamu Muta

    IEEE Vehicular Technology Conference Fall 2024  IEEE

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    Event date: 2024.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington DC   Country:United States  

  • Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration

    Zhuoran Li, Osamu Muta, Yutaka Jitsumatsu

    電子情報通信学会 コミュニケーションクオリティ研究会  2024.9  電子情報通信学会

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    Event date: 2024.9

    Language:English  

    Venue: 函館市民会館  

  • 無線LANのCSI を利用した物体検知方式の屋外特性評価

    清水俊亮, 牟田修, 村上友規, 大槻信也, 大谷花絵

    電子情報通信学会ソサイエティ大会  2024.9  電子情報通信学会

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本工業大学   Country:Japan  

  • ピークキャンセラを適用した平面アレー多素子MIMO-OFDMにおける帯域内歪み補償用アンテナ配置の検討(2)

    大本美怜奈, 李卓然, 牟田修, 丸田一輝

    電子情報通信学会ソサイエティ大会  2024.9  電子情報通信学会

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本工業大学   Country:Japan  

  • 無線LANのCSIを利用した屋内物体検知方式の検知率特性評価(2)

    #和泉潤佑, #清水俊亮, @牟田修, @村上友規, @大槻信也

    電子情報通信学会 総合大会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • 建設現場における三次元測位に向けた920MHz帯LoRaWANを用いる平面位置推定の検討と実験評価(3)

    #中野恭輔, @牟田 修, @渡辺拓人, @池田直広

    電子情報通信学会 総合大会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • Experimental Study on Microwave Heating of Soil for Nematode Control International conference

    Tanemasa Asano, Hideaki Iwahori, Ahmed Allam, Osamu Muta, Haruichi Kanaya and Adel B. Abdel-Rahman

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Tanemasa Asano, Hideaki Iwahori, Ahmed Allam, Osamu Muta, Haruichi Kanaya and Adel B. Abdel-Rahman, "Experimental Study on Microwave Heating of Soil for Nematode Control," International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023, Dec. 2023.

  • Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration International conference

    #Zhuoran Li, @Osamu Muta and @Yutaka Jitsumatsu

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Zhuoran Li, Osamu Muta and Yutaka Jitsumatsu, "Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration," International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023, Dec. 2023.

  • Deep Reinforcement Learning Based Computing Resource Allocation in Fog Radio Access Networks

    #Tong Zhaowei, #Ahmad Gendia, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州工業大学   Country:Japan  

  • Experimental Analysis of Indoor Localization Using Channel State Information in WLAN Systems Invited International conference

    Osamu Muta

    International Conference on Emerging Technologies for Communications (ICETC) 2023  2023.12 

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    Event date: 2023.11 - 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

    Osamu Muta, "Experimental Analysis of Indoor Localization Using Channel State Information in WLAN Systems," International Conference on Emerging Technologies for Communications (ICETC) 2023, Dec. 2023.

  • Multiuser Scheduling to Improve Iterative Interference Replica Subtraction with Partial Zeroization for Massive MIMO Systems International conference

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta

    2023 International Conference On Advanced Technologies For Communications (ATC2023)  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Da Nang   Country:Viet Nam  

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta, "Multiuser Scheduling to Improve Iterative Interference Replica Subtraction with Partial Zeroization for Massive MIMO Systems," 2023 International Conference On Advanced Technologies For Communications (ATC2023), Oct. 2023.

  • ピークキャンセラを適用した平面アレー多素子MIMO-OFDMにおける帯域内歪み補償用アンテナ配置の検討

    #野島 陸, @牟田 修, @丸田一輝

    電子情報通信学会 無線通信システム研究会  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学   Country:Japan  

  • Experimental Evaluation of MIMO-WLAN-based Object Detection with Reflectors International conference

    Shunsuke Shimizu, Osamu Muta, Kazuki Noguchi, Junsuke Izumi, Tomoki Murakami, and Shinya Otsuki

    IEEE Vehicular Technology Conference 2023 Fall (VTC2023-Fall)  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hong-Kong   Country:China  

    Shunsuke Shimizu, Osamu Muta, Kazuki Noguchi, Junsuke Izumi, Tomoki Murakami, and Shinya Otsuki, "Experimental Evaluation of MIMO-WLAN-based Object Detection with Reflectors," Proc. IEEE Vehicular Technology Conference 2023 Fall (VTC2023-Fall), Oct. 2023.

  • 建設現場におけるLPWANを用いた見通し外3次元位置推定に向けた検討と実験評価

    #中野恭輔, @牟田 修, @渡辺拓人, @池田直広

    革新的無線通信技術に関する横断型研究会(MIKA)2023  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄県市町村自治会館   Country:Japan  

  • 無線LANのCSIを利用した屋内物体検知方式におけるアンテナ配置に関する検討と実験評価

    #和泉潤佑, #清水俊亮, @牟田 修, @村上友規, @大槻信也

    革新的無線通信技術に関する横断型研究会(MIKA)2023  2023.10 

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    Event date: 2023.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄県市町村自治会館   Country:Japan  

  • Performance of WLAN-based Object Detection with Distributed Antenna and Spatially Concatenated CSI International conference

    #Shunsuke Shimizu, @Osamu Muta, #Kazuki Noguchi, @Tomoki Murakami, and @Shinya Otsuki

    IEEE VTC2023Fall Workshop  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hong-Kong   Country:China  

    Shunsuke Shimizu, Osamu Muta, Kazuki Noguchi, Tomoki Murakami, and Shinya Otsuki, "Performance of WLAN-based Object Detection with Distributed Antenna and Spatially Concatenated CSI," IEEE VTC2023-Fall Workshop (Workshop on Integrated Sensing, Communication, and Computation towards 6G held at VTC2023-Fall), Oct. 2023.

  • A Multi-agent Multi-armed Bandit Approach for User Pairing in UAV-assisted NOMA-Networks International conference

    Boniface Uwizeyimana, Ahmed H. Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty,

    International Symposium on Networks, Computers and Communications 2023 (ISNCC'23)  2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Doha, Qatar   Country:Other  

    Boniface Uwizeyimana, Ahmed H. Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty, "A Multi-agent Multi-armed Bandit Approach for User Pairing in UAV-assisted NOMA-Networks," Proc. the 10th International Symposium on Networks, Computers and Communications (ISNCC'23), Oct. 2023.

  • 建設現場における三次元測位に向けた920MHz帯LoRaWANを用いる平面位置推定の検討と実験評価(2)

    #中野恭輔, @牟田修, @渡辺拓人, @池田直広

    電子情報通信学会 ソサイエティ大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • 無線LANのCSI を利用した屋内物体検知方式の検知率特性評価―アンテナ配置と素子数が検知特性に与える影響―

    #和泉潤佑, #清水俊亮, @牟田修, @村上友規, @大槻信也

    電子情報通信学会 ソサイエティ大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • ピークキャンセラを適用した平面アレー多素子MIMO-OFDMにおける帯域内歪み補償用アンテナ配置の検討

    #野島陸, #大本美怜奈, @牟田修, @丸田一輝

    電子情報通信学会 ソサイエティ大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • 建設現場におけるLPWANを用いた見通し外3次元位置推定に向けた検討と実験評価

    #中野恭輔, @牟田 修, @渡辺拓人, @池田直広

    電子情報通信学会 コミュニケーションクオリティ研究会  2023.9 

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    Event date: 2023.8 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:天神岬スポーツ公園   Country:Japan  

  • 無線LANのCSI を利用した屋内物体検知の検討と実験評価 Invited

    牟田修, 野口知樹, 清水俊亮, 村上友規, 大槻信也

    電子情報通信学会 コミュニケーションシステム研究会  2023.7 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:八丈町商工会   Country:Japan  

  • 平面アレーアンテナを用いる多素子MIMO-OFDMのためのピークキャンセラとその歪み補償の検討(2)

    #大本美怜奈, #野島 陸, @牟田 修, @丸田一輝

    電子情報通信学会 無線通信システム研究会  2023.6 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • 無線LANのCSIを利用した屋内物体検知方式におけるアンテナ配置に関する検知特性の実験評価

    #清水俊亮, #野口知樹, @牟田 修, @村上友規, @大槻信也

    電子情報通信学会 無線通信システム研究会  2023.6 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • Ahmad Gendia, and Osamu Muta, A Study on Data-Driven Resource Allocation for NOMA Downlink

    #Ahmad Gendia, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2023.6 

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    Event date: 2023.6 - 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • Massive MIMO繰り返しレプリカ減算型ユーザ間干渉抑圧方式における性能改善

    鈴木大空斗, Salah Berra, 丸田一輝, 牟田 修

    電子情報通信学会 無線通信システム研究会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学   Country:Japan  

    Takuto Suzuki, Salah Berra, Kazuki Maruta, Osamu Muta, "Improving Iterative Interference Replica Subtraction based Precoding for Massive MIMO Systems by Partial Zeroization", IEICE RCS national conference, May 2023.

  • Age of Information Analysis for Full Duplex Cooperative SWIPT NOMA System International conference

    Simon Kaboyo, Ahmed Hassan Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty

    IEEE Wireless Communications and Networking Conference (WCNC2024)  2024.12 

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    Event date: 2023.4 - 2024.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Dubai   Country:United Arab Emirates  

    Simon Kaboyo, Ahmed Hassan Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad, Maha Elsabrouty, "Age of Information Analysis for Full Duplex Cooperative SWIPT NOMA System," IEEE Wireless Communications and Networking Conference (WCNC2024), April 2024.

  • 建設現場における三次元測位に向けた920MHz帯LoRaWANを用いる平面位置推定の検討と実験評価

    中野恭輔, 井上貴裕, 牟田 修, 渡辺拓人, 池田直広

    電子情報通信学会 総合大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:芝浦工業大学   Country:Japan  

  • 無線LANのCSI を利用した屋内物体検知特性の実験評価 ~アンテナ配置が検知特性に与える影響~

    #野口知樹, @牟田修, @村上友規, @大槻信也

    電子情報通信学会 コミュニケーションシステム研究会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北九州国際会議場   Country:Japan  

  • Improving Iterative Interference Replica Subtraction based Precoding for Massive MIMO Systems by Partial Zeroization International conference

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta

    2023 IEEE 20th Consumer Communications & Networking Conference (CCNC)  2023.1 

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    Event date: 2023.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Las Vegas   Country:United States  

    Takuto Suzuki, Salah Berra, Kazuki Maruta, and Osamu Muta, "Improving Iterative Interference Replica Subtraction based Precoding for Massive MIMO Systems by Partial Zeroization," 2023 IEEE 20th Consumer Communications & Networking Conference (CCNC).

  • Experimental Analysis of CSI-based Indoor Localization Toward Joint Communications and Sensing Invited International conference

    Osamu Muta

    International Japan-Africa Conference on Electronics, Communications and Computations 2022  2022.12 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Osamu Muta, "Experimental Analysis of CSI-based Indoor Localization Toward Joint Communications and Sensing"
    International Japan-Africa Conference on Electronics, Communications and Computations 2022, Dec. 2022.

  • ピークキャンセラを用いる多素子MIMO-OFDMにおける帯域内補償に適したプリコーディング規範に関する検討

    槇田智史, 牟田 修, 野島 陸, 丸田一輝

    電子情報通信学会 無線通信システム研究会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  • 建設現場における3次元位置推定に向けた920MHz帯LoRaWANを用いる平面位置推定の検討と実験評価

    中野恭輔, 井上貴裕, 牟田 修, 渡辺拓人, 池田直広

    電子情報通信学会 無線通信システム研究会  2022.12 

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    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

  • Investigation on Microwave Heating Characteristic of Watery Object Buried in Soil International conference

    Tanemasa Asano, Ahmed Allam, Osamu Muta, Haruichi Kanaya, Adel B. Abdel-Rahman

    International Japan-Africa Conference on Electronics, Communications and Computations 2022  2022.12 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Tanemasa Asano, Ahmed Allam, Osamu Muta, Haruichi Kanaya, Adel B. Abdel-Rahman, "Investigation on Microwave Heating Characteristic of Watery Object Buried in Soil," International Japan-Africa Conference on Electronics, Communications and Computations 2022, Dec. 2022.

  • Multi-Armed Bandit and Repeated Auction Approaches for User Admission and Channel Allocation in 5G HetNets

    Boniface Uwizeyimana, Ahmed Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad and Maha Elsabrouty

    International Japan-Africa Conference on Electronics, Communications and Computations 2022  2022.12 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Boniface Uwizeyimana, Ahmed Abd El-Malek, Osamu Muta, Mohammed Abo-Zahhad and Maha Elsabrouty,
    Multi-Armed Bandit and Repeated Auction Approaches for User Admission and Channel Allocation in 5G HetNets ,"
    International Japan-Africa Conference on Electronics, Communications and Computations 2022, Dec. 2022.

  • Heterogeneous Carrier-Sense Multiple Access for Improved Energy Fairness in LoRaWAN International conference

    Chenglong Shao, Osamu Muta

    The Tenth International Symposium on Computing and Networking (CANDAR) 2022  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Arcrea HIMEJI (Himeji Culture and Convention Center)   Country:Japan  

    Chenglong Shao, Osamu Muta, "Heterogeneous Carrier-Sense Multiple Access for Improved Energy Fairness in LoRaWAN,"
    The Tenth International Symposium on Computing and Networking (CANDAR) 2022, Nov. 2022.

  • 建設現場における3次元位置推定に向けた920MHz帯LoRaWANを用いる階高推定の検討

    井上貴裕, 中野恭輔, 牟田 修, 渡辺拓人, 池田直広

    電子情報通信学会 無線通信システム研究会  2022.11 

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    Event date: 2022.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Toward Improved Energy Fairness for CSMA-based LoRaWAN

    Chenglong Shao, Osamu Muta

    電子情報通信学会 無線通信システム研究会  2022.10 

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学   Country:Japan  

  • 端末連携によって実現する新たな無線通信システム ~ 最近の結果とアップリンクへの適用 ~

    村田英一, 井田悠太, 丸田一輝, 實松 豊, 牟田 修, 岡田 啓, 岡本英二, 眞田幸俊, 西村寿彦, 田野 哲

    電子情報通信学会 無線通信システム研究会  2022.10 

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学   Country:Japan  

  • 建設現場における920MHz帯LoRaWANを用いる見通し外3次元位置推定の検討と実験評価

    #井上貴裕, @中野恭輔, @牟田 修, @渡辺拓人, @池田直広

    革新的無線通信技術に関する横断型研究会(MIKA)  2022.10 

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟市民プラザ   Country:Japan  

  • Massive MIMO繰り返しレプリカ減算型ユーザ間干渉抑圧方式における性能改善の検討

    鈴木大空斗, 丸田一輝, Salah Berra, 牟田 修

    革新的無線通信技術に関する横断型研究会(MIKA)  2022.10 

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    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟市民プラザ   Country:Japan  

  • 下り回線NOMAにおけるチャネル状態を考慮した圧縮センシングに基づく電力割当・ユーザ選択方式(2)

    #槇田智史, @牟田 修

    電子情報通信学会 コミュニケーションクオリティ研究会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道立道民活動センター   Country:Japan  

  • UAV Positioning with Joint NOMA Power Allocation and Receiver Node Activation International conference

    #Gendia Ahmad, @Muta Osamu, @Hashima Sherief, @Hatano Kohei

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Gendia Ahmad, Muta Osamu, Hashima Sherief, Hatano Kohei, "UAV Positioning with Joint NOMA Power Allocation and Receiver Node Activation," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • Joint Peak Cancellation and In-band Distortion Compensation Scheme for Precoded Massive MIMO-OFDM with Uniform Planar Array International conference

    #Riku NOJIMA, @Osamu MUTA, #Tomofumi MAKITA, @Kazuki MARUTA

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Riku NOJIMA, Osamu MUTA, Tomofumi MAKITA, Kazuki MARUTA, "Joint Peak Cancellation and In-band Distortion Compensation Scheme for Precoded Massive MIMO-OFDM with Uniform Planar Array," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • Experimental Evaluation of Floor Height Estimation Using Unlicensed-Band LPWA Signals Toward Three-Dimensional NLOS Indoor Positioning International conference

    #Kyosuke Nakano, @Osamu Muta, #Takahiro Inoue, @Takuto Watanabe, @Naohiro Ikeda

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Kyosuke Nakano, Osamu Muta, Takahiro Inoue, Takuto Watanabe, Naohiro Ikeda, "Experimental Evaluation of Floor Height Estimation Using Unlicensed-Band LPWA Signals Toward Three-Dimensional NLOS Indoor Positioning," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022, Sept. 2022.

  • ピークキャンセラを適用した多素子MIMO-OFDMにおける帯域内歪み補償用アンテナ選択に関する検討

    #野島 陸, @牟田 修, #槇田智史, @丸田一輝

    電子情報通信学会 ソサイエティ大会  2022.9 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • UAV Positioning and User Pairing in NOMA via Reinforcement Learning

    #Gendia Ahmad, @Muta Osamu, @Hashima Sherief, @Hatano Kohei

    電子情報通信学会 ソサイエティ大会  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 建設現場における三次元位置推定に向けた920MHz帯LoRaWANを用いた階高推定の検討

    #井上 貴裕, @牟田 修, #中野 恭輔, @渡辺 拓人, @池田 直広

    電子情報通信学会 ソサイエティ大会  2022.9 

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    Event date: 2022.9 - 2022.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Joint UAV Positioning and User Pairing via Reinforcement Learning Based Selection in NOMA Systems

    #Ahmad Gendia, @Osamu Muta, @Sherief Hashima, @Kohei Hatano

    電子情報通信学会 無線通信システム研究会  2022.8 

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    Event date: 2022.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:函館市亀田交流プラザ   Country:Japan  

  • 平面アレーアンテナを用いる多素子MIMO-OFDMのためのピークキャンセラとその歪み補償の検討

    #野島 陸, @牟田 修, #槇田智史, @丸田一輝

    電子情報通信学会 無線通信システム研究会  2022.7 

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    Event date: 2022.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢歌劇座   Country:Japan  

  • Intelligent Reflecting Surface Joint Uplink-Downlink Optimization for NOMA Network International conference

    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty

    IEEE Vehicular Technology Conference Fall 2021  2022.6 

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    Event date: 2022.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Helsinki   Country:Finland  

  • LiCo: Toward Lightweight Resolution of Signal Collisions in LoRaWAN

    Chenglong Shao, Osamu Muta

    電子情報通信学会 無線通信システム研究会  2022.5 

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    Event date: 2022.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学   Country:Japan  

  • Toward Lightweight Resolution of Signal Collisions in Chirp Spread Spectrum Systems

    Chenglong Shao, Osamu Muta

    電子情報通信学会 総合大会  2022.3 

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    Event date: 2022.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANにおける系列化CSI を利用した物体検知に関する検討

    #野口知樹, #高田圭輔, 牟田修, 村上友規, 大槻信也

    電子情報通信学会 総合大会  2022.3 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Enhanced Selected Mapping for Impulsive Noise Blanking in Multi-Carrier Power-line Communication Systems Invited International conference

    Osamu Muta

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)  2021.12 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Osamu Muta,
    [Invited] Enhanced Selected Mapping for Impulsive Noise Blanking in Multi-Carrier Power-line Communication Systems
    2021 International Conference on Emerging Technologies for Communications (ICETC 2021), Dec. 2021.

  • Adaptive In-band Distortion Compensation for Spatially Precoded Massive MU-MIMO Systems with Deep Peak Cancellation International conference

    #Hiroki HASE, @Osamu MUTA

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)  2021.12 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Hiroki HASE, and Osamu MUTA,
    Adaptive In-band Distortion Compensation for Spatially Precoded Massive MU-MIMO Systems with Deep Peak Cancellation
    2021 International Conference on Emerging Technologies for Communications (ICETC 2021), Dec. 2021.

  • VirCh: Virtual Mobile Charger-basedWireless Power Transfer for Large-Scale Internet-of-Things Systems International conference

    Chenglong SHAO and Osamu MUTA

    2021 International Conference on Emerging Technologies for Communications (ICETC 2021)  2021.12 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Chenglong SHAO and Osamu MUTA
    VirCh: Virtual Mobile Charger-basedWireless Power Transfer for Large-Scale Internet-of-Things Systems
    2021 International Conference on Emerging Technologies for Communications (ICETC 2021), Dec. 2021.

  • 下り回線NOMAにおけるQoS制約を考慮した圧縮センシングに基づくユーザペアリング手法の検討(2)

    #槇田智史, @牟田 修

    電子情報通信学会 無線通信システム研究会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANにおける系列化CSIを用いる物体検知の検討

    #高田圭輔, #野口知樹, @牟田 修, @村上友規, @大槻信也

    電子情報通信学会 無線通信システム研究会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANにおける系列化伝搬チャネル情報を活用した物体検知方式の検討

    #野口知樹, @牟田修, @村上友規, @大槻信也

    革新的無線通信技術に関する横断型研究会(MIKA)  2021.10 

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 下り回線NOMAにおける圧縮センシングに基づく電力割当・ユーザ選択方式

    #槇田智史, @牟田 修

    革新的無線通信技術に関する横断型研究会(MIKA)  2021.10 

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • ピークキャンセラを適用した大規模MIMO-OFDMのための適応帯域内歪み補償の検討

    #波瀬 浩樹, @牟田 修

    革新的無線通信技術に関する横断型研究会(MIKA)  2021.10 

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    Event date: 2021.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Performance Analysis of Intelligent Reflecting Surface Selection for Orthogonal and Non-Orthogonal Multiple Access International conference

    Mostafa Samy, Mohammed Abo-Zahhad, Osamu Muta, Adel Bedair, Maha Elsabrouty

    International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob)  2021.10 

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    Event date: 2021.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • QoS-aware Low-complexity User Pairing Based on Compressed Sensing in Downlink NOMA International conference

    #Tomofumi Makita, @Osamu Muta

    IEEE Vehicular Technology Conference Fall 2021  2021.9 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Tomofumi Makita and Osamu Muta, "QoS-aware Low-complexity User Pairing Based on Compressed Sensing in Downlink NOMA,' IEEE Vehicular Technology Conference Fall 2021, Sept. 2021.

  • A CSI-based Object Detection Scheme using Interleaved Subcarrier Selection in Wireless LAN Systems with Distributed Antennas International conference

    #Kazuki Noguchi, @Osamu Muta, @Tomoki Murakami, @Shinya Otsuki

    IEEE Vehicular Technology Conference Fall 2021  2021.9 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Kazuki Noguchi, Osamu Muta, Tomoki Murakami, and Shinya Otsuki
    A CSI-based Object Detection Scheme using Interleaved Subcarrier Selection in Wireless LAN Systems with Distributed Antennas
    Vehicular Technology Conference Fall 2021, Sept. 2021.

  • 下り回線NOMAにおける圧縮センシングに基づくユーザー選択に関する検討

    #槇田智史, @牟田修

    電子情報通信学会 ソサイエティ大会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANの伝搬チャネル情報を活用した物体検知のための周波数領域特徴量選択方式の実験評価

    #野口知樹, @牟田修, @村上友規, @大槻信也

    電子情報通信学会ソサイエティ大会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Dude, Are You Approaching Me? Detecting Close Physical Contact via Unlicensed LPWAN Signals

    Chenglong Shao, Osamu Muta

    電子情報通信学会 コミュニケーションクオリティ研究会  2021.9 

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    Event date: 2021.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 下り回線NOMAにおけるチャネル状態を考慮した圧縮センシングに基づく電力割当・ユーザ選択方式

    #槇田智史, @牟田修

    電子情報通信学会 コミュニケーションクオリティ研究会  2021.9 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 下り回線NOMAにおける動的リソース割当時の圧縮センシングに基づくユーザ選択方式

    #槇田智史, @牟田 修

    電子情報通信学会 コミュニケーションシステム研究会  2021.7 

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    Event date: 2021.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANの伝搬チャネル情報を活用した物体検知のための周波数領域特徴量選択手法の実験評価

    #野口知樹, @牟田 修, @村上友規, @大槻信也

    電子情報通信学会 無線通信システム研究会  2021.6 

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 下り回線NOMAにおけるQoS制約を考慮した圧縮センシングに基づくユーザペアリング手法の検討

    #槇田智史, @牟田 修

    電子情報通信学会 無線通信システム研究会  2021.6 

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Dude, Are You Approaching Me? Detecting Close Physical Contact via Unlicensed LPWAN Signals International conference

    @Chenglong Shao, @Osamu Muta,

    IEEE ICC 2021 Workshop  2021.6 

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    Event date: 2021.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Other  

    Chenglong Shao and Osamu Muta,
    ``Dude, Are You Approaching Me? Detecting Close Physical Contact via Unlicensed LPWAN Signals,''
    IEEE ICC 2021 Workshop - IoMT, June 2021.

  • Reinforcement Learning-Based User Pairing in NOMA Systems

    #Ahmad Gendia, @Osamu Muta

    電子情報通信学会 総合大会  2021.3 

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    Event date: 2021.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANの伝搬チャネル状態情報を活用した物体検知システムにおける特徴量選択に関する検討(2)

    安藤永稀, 千手広輝, 牟田修, 村上友規, 大槻信也

    電子情報通信学会 無線通信システム研究会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • User Pairing via Reinforcement Learning Based Selection in NOMA Systems

    Ahmad Gendia, Osamu Muta

    電子情報通信学会 無線通信システム研究会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • A Neural Network-Based PAPR Reduction Approach for OFDM Signals

    #Ahmad Gendia, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2021.1 

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    Event date: 2021.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • ピークリミタを適用したMassive MIMO-OFDMのための余剰アンテナを活用した歪み補償の一検討

    #川越詞文, @牟田 修

    電子情報通信学会 コミュニケーションクオリティ研究会  2021.1 

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • 無線LANの伝搬チャネル状態情報を活用した物体検知システムにおける特徴量選択手法の評価

    #安藤永稀, #千手広輝, @牟田修, @村上友規, @大槻信也

    電子情報通信学会 コミュニケーションクオリティ研究会  2021.1 

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Improving Low Complexity Inter-User Interference Cancellation for Massive MIMO Systems International conference

    Kazuki MUKAI, Kazuki MARUTA, Osamu MUTA, and Chang-Jun AHN

    International Conference on Emerging Technologies for Communications (ICETC 2020)  2020.12 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Kazuki MUKAI, Kazuki MARUTA, Osamu MUTA, and Chang-Jun AHN, ``Improving Low Complexity Inter-User Interference Cancellation for Massive MIMO Systems,'' International Conference on Emerging Technologies for Communications (ICETC 2020), Dec. 2020.

  • 無線LANの伝搬チャネル状態情報を活用した物体検知システムにおける特徴量選択に関する検討

    #千手広輝, @牟田 修, @村上友規, @大槻信也

    電子情報通信学会 無線通信システム研究会  2020.11 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Performance Evaluation of Object Detection Utilizing Channel State Information in Wireless LAN Systems with Distributed Antennas International conference

    Keisuke Takata, Osamu Muta, Tomoki Murakami, Shinya Otsuki

    23rd International Symposium on Wireless Personal Multimedia Communications (WPMC2020)  2020.10 

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

  • Neural Network-Based PAPR Reduction of OFDM Signals

    #Ahmad Gendia, @Osamu Muta

    電子情報通信学会 ソサイエティ大会  2020.9 

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    Event date: 2020.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    Neural Network-Based PAPR Reduction of OFDM Signals

  • 無線LANのCSI を利用した物体検知に関する一検討

    #高田圭輔, @牟田修, @村上友規, @大槻信也, @小川智明

    電子情報通信学会 ソサイエティ大会  2020.9 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン開催   Country:Japan  

    A machine learning-based object detection utilizing CSI in WLAN

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの歪み補償の検討 -ベクトル摂動プリコーディングを用いる場合への拡張-

    #景山知哉, @牟田修

    電子情報通信学会 総合大会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • 無線LANのCSIを利用した物体検知の検討その1-周波数選択性を考慮した特徴量選択法の提案-

    #千手広輝, #景山知哉, @牟田修, @村上友規, @大槻信也, @小川智明

    電子情報通信学会 総合大会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • 無線LANのCSIを利用した物体検知の検討その2-MIMO伝搬チャネルを考慮した物体検知手法の提案-

    #安藤永稀, #景山知哉, @牟田修, @村上友規, @大槻信也, @小川智明

    電子情報通信学会 総合大会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • Massive MIMOにおける低演算量ユーザ間干渉抑圧方式の特性改善

    #向井和輝, @丸田一輝, @牟田修, @安昌俊

    電子情報通信学会 総合大会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学   Country:Japan  

  • 無線LANの伝搬チャネル情報を利用した物体検知の検討

    #景山知哉, #高田圭輔, #安藤永稀, #千手広輝, @牟田修, @村上友規, @大槻信也, @小川智明,

    電子情報通信学会 無線通信システム研究会  2020.3 

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    Event date: 2020.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  • Energy and Spectrum Efficient Power Allocation in Downlink NOMA Heterogeneous Networks

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2020.1 

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    Event date: 2020.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島市青少年センター   Country:Japan  

  • A Partial Scrambling Overlapped Selected Mapping PAPR Reduction Scheme for OFDM/OQAM Systems International conference

    #Tomoya Kageyama, @Osamu Muta

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC 2019)  2019.12 

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    Event date: 2019.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    A Partial Scrambling Overlapped Selected Mapping PAPR Reduction Scheme for OFDM/OQAM Systems

  • A Partial Scrambling Overlapped Selected Mapping PAPR Reduction Scheme for OFDM/OQAM Systems International conference

    #Tomoya Kageyama, @Osamu Muta,

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC 2019)  2019.12 

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    Event date: 2019.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

  • 非線形プリコーディングを用いる多素子MIMO-OFDMにおける空間相関影響下でのピークキャンセラによるピーク電力抑圧とその帯域内歪み補償の効果

    #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2019.10 

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    Event date: 2019.10 - 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:霧島ホテル   Country:Japan  

  • 非線形プリコーディングを用いる多素子MIMO-OFDMにおけるピークキャンセラによるPAPR抑圧とその帯域内歪み補償の効果

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.10 

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    Event date: 2019.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • A Downlink Cooperative Channel Estimation Scheme for FDD Massive MIMO with Parametric Feedback

    #Ahmed Nasser, @Maha Elsabrouty, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2019.10 

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    Event date: 2019.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • The Effect of Power Control based Interference Mitigation for Two-Tier MIMO Heterogeneous Networks

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2019.10 

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    Event date: 2019.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 多素子MIMO TDD ヘテロジニアスネットワークにおけるパイロットオーバーヘッドを考慮したセル間干渉軽減に関する検討

    #神渡俊介, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.10 

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    Event date: 2019.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • Bit Error Rate Analysis of MRC Precoded Massive MIMO-OFDM Systems with Peak Cancellation International conference

    #Tomoya Kageyama, @Osamu Muta

    IEEE Vehicular Technology Conference Fall 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Honolulu   Country:United States  

  • Two-dimensional Pilot Allocation for Massive MIMO/TDD Systems International conference

    @Osamu Muta, #Kouki Matsuzaki, @Haris Gacanin

    IEEE Vehicular Technology Conference Fall 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii   Country:United States  

    Two-dimensional Pilot Allocation for Massive MIMO/TDD Systems

  • Pilot-Assisted Sparse Channel Estimation Based on Mutual Incoherence Property International conference

    #Ahmed Nasser, @Osamu Muta, @Maha Elsabrouty

    IEEE Vehicular Technology Conference Fall 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hawaii   Country:United States  

    Pilot-Assisted Sparse Channel Estimation Based on Mutual Incoherence Property

  • Bit Error Rate Analysis of MRC Precoded Massive MIMO-OFDM Systems with Peak Cancellation

    #Tomoya Kageyama, @Osamu Muta,

    IEEE Vehicular Technology Conference Fall 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Honolulu   Country:United States  

  • 異種無線網におけるセル間干渉抑圧技術

    牟田修, Ahmed Nasser

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • Sparse User Pairing and Power Allocation Scheme for NOMA Systems

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • A Pilot-Assisted Sparse Channel Estimation Scheme Based on Mutual Incoherence Property for Wireless Cellular Networks

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • ピークキャンセラを適用した多素子MIMO-OFDMにおける所要EVMに応じた帯域内歪み補償方式

    #景山知哉, @牟田修

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • 周波数共用MIMO ヘテロジニアスネットワークにおけるパイロットオーバーヘッドを考慮したセル間干渉軽減に関する検討

    #神渡俊介, @牟田修

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • 非線形プリコーディングとピークリミタを用いる多素子MIMOの余剰アンテナを用いたBER改善手法に関する検討

    #川越詞文, #景山知哉, @牟田修

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • 無線LAN-APの受信電波強度値を利用した機械学習による屋内位置推定の一検討

    #早田健斗, @牟田修

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • ピークリミタと反復歪み補償を適用した多素子MIMO-OFDMの特性評価

    #田添諒, #景山知哉, @牟田修

    電子情報通信学会 ソサイエティ大会  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • Performance Analysis of Power Control Based Interference Coordination for Downlink MIMO HetNets Invited International conference

    #Ahmed Nasser, @Osamu Muta

    IEEE APWCS2019  2019.8 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Singapore   Country:Singapore  

    Performance Analysis of Power Control Based Interference Coordination for Downlink MIMO HetNets

  • 2層異種混合無線網における送信電力制御に基づくセル間干渉抑圧の検討

    @牟田 修, #Ahmed Nasser

    電子情報通信学会 コミュニケーションクオリティ研究会  2019.8 

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    Event date: 2019.8

    Language:Japanese  

    Venue:函館   Country:Japan  

  • 非線形プリコーディングを用いる多素子MIMOシステムへのピークリミタとその歪み補償技術の適用に関する検討

    #景山知哉, @牟田 修

    電子情報通信学会 コミュニケーションクオリティ研究会  2019.8 

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    Event date: 2019.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:函館   Country:Japan  

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの所要EVMに応じた帯域内歪み補償方式(2)

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.10 

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    Event date: 2019.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの所要EVMに応じた帯域内歪み補償方式

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.7 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪府立大学   Country:Japan  

    An in-band distortion compensation scheme utilizing extra antennas under EVM requirements for massive MIMO-OFDM with peak cancellation

  • 非線形プリコーディングを用いる多素子MIMOのためのピーク電力制御と余剰アンテナを用いたBER改善手法に関する検討

    #川越詞文, #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2019.7 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:奄美市社会福祉センター   Country:Japan  

    A study on BER improvement with peak power control and extra antenna for non-linear pre-coded massive MIMO systems

  • 多素子MIMO-OFDM用ピークキャンセラとその歪み補償技術の検討

    #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2019.7 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:奄美市社会福祉センター   Country:Japan  

    A study on peak cancellation and in-band distortion compensation for massive MIMO-OFDM

  • ピーク電力制約下でのアンテナ相関を考慮した空間プリコーディングの検討

    #田添諒, #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2019.7 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:奄美市社会福祉センター   Country:Japan  

    A study on spatial pre-coding method considering antenna correlation under peak power constraint

  • ピークリミタとその歪み補償を適用した多素子MIMO多値QAM-OFDMの伝送特性評価

    #川越詞文, #景山知哉, @牟田 修

    電子情報通信学会 コミュニケーションクオリティ研究会  2019.5 

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島市立大学   Country:Japan  

  • Cross-Tier Interference Management Scheme for Downlink mMIMIO-NOMA HetNet International conference

    #Ahmed Nasser, @Osamu Muta, and @Maha Elsabrouty

    IEEE Vehicular Technology Conference Spring 2019  2019.4 

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    Event date: 2019.4 - 2019.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kuala Lumpur   Country:Malaysia  

    Cross-Tier Interference Management Scheme for Downlink mMIMIO-NOMA HetNet

  • A Sparse Pilot-Subcarrier Allocation Scheme for Downlink Channel Estimation in OFDM Systems

    #Ahmed Nasser, @Osamu Muta,

    電子情報通信学会 無線通信システム研究会  2019.3 

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    Event date: 2019.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:登別グランドホテル   Country:Japan  

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの歪み補償に関する検討

    #景山知哉, @牟田 修

    電子情報通信学会 総合大会  2019.3 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • Sparse Power and Spectrum Allocation Scheme for HetNet

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 総合大会  2019.3 

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • ピークリミタとその歪み補償を適用した多素子MIMO多値QAM-OFDMの伝送特性評価

    #川越詞文, #景山知哉, @牟田 修

    電子情報通信学会 総合大会  2019.3 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • TDD-HetNet における上り回線パイロット割当と下り回線干渉軽減に関する一検討

    #神渡俊介, @牟田 修

    電子情報通信学会 総合大会  2019.3 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学   Country:Japan  

  • 多素子MIMOにおけるピークリミタを用いるPAPR低減の効果(2)

    #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2019.3 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:湘南工科大学   Country:Japan  

  • Sparse Power Allocation and User Pairing in NOMA Systems

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 通信方式研究会  2019.3 

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:湘南工科大学   Country:Japan  

  • Compressive Sensing for Power and Spectrum Allocation in HetNet

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2019.3 

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの帯域内歪み補償に関する検討(2)

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.3 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • 多素子MIMO-OFDMにおける余剰アンテナを活用したピークキャンセラの帯域内歪み補償に関する検討

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2019.1 

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    Event date: 2019.1 - 2019.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学   Country:Japan  

  • 低消費電力無線受信機のためのヒステリシスコンパレータとディザーを活用したADCの検討

    @遠藤央瑠人, @兼本大輔, #景山知哉, @牟田 修, @大木 真

    電気学会 電子回路研究会  2018.12 

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    Event date: 2018.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学   Country:Japan  

  • Effect of Limiter based PAPR Reduction for Massive MIMO Systems International conference

    #Tomoya Kageyama, @Osamu Muta, @Cheng-Ming Chen, @SofiePollin

    International Japan-Africa Conference on Electronics, Communications and Computations 2018  2018.12 

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    Event date: 2018.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Alexandria   Country:Egypt  

    Tomoya Kageyama, Osamu Muta, Cheng-Ming Chen and SofiePollin, ``Effect of Limiter based PAPR Reduction for Massive MIMO Systems,'' International Japan-Africa Conference on Electronics, Communications and Computations 2018, Dec. 2018.

  • Pilot Allocation and Interference Coordination for Heterogeneous Network with Massive MIMO/TDD International conference

    @Osamu Muta, #Wanming Hao, @Haris Gacanin

    2018 International Symposium on Intelligent Signal Processing and Communication Systems  2018.11 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:沖縄県 石垣市   Country:Japan  

    Osamu Muta, Wanming Hao, Haris Gacanin, ``Pilot Allocation and Interference Coordination for Heterogeneous Network with Massive MIMO/TDD, '' 2018 International Symposium on Intelligent Signal Processing and Communication Systems, Nov. 2018.

  • MIMOヘテロジニアスネットワーク下り回線における干渉軽減に関する検討

    @牟田 修

    電子情報通信学会 無線通信システム研究会  2018.11 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄県 那覇市   Country:Japan  

    A Study on Interference Mitigation for Downlink MIMO Heterogeneous Networks

  • A Competition based Power Allocation Scheme for Downlink NOMA HetNet

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 通信方式研究会  2018.11 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:愛媛県 松山市   Country:Japan  

    A Competition based Power Allocation Scheme for Downlink NOMA HetNet

  • 多素子MIMOにおけるピークリミタを用いるPAPR低減の効果

    #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2018.11 

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    Event date: 2018.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛県 松山市   Country:Japan  

    Effect of Limiter based PAPR Reduction for Massive MIMO Systems

  • A hierarchical interference alignment and coordinated beamforming scheme for downlink NOMA-HetNet with massive MIMO

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2018.10 

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    Event date: 2018.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

    A hierarchical interference alignment and coordinated beamforming scheme for downlink NOMA-HetNet with massive MIMO

  • ピークキャンセラ適用時の多素子MIMO-OFDM-SDMAシステムのビット誤り率評価

    #田添 諒, #景山知哉, @牟田 修

    電気・情報関係学会九州支部連合大会  2018.9 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大分大学   Country:Japan  

    Bit Error Rate Evaluation of massive MIMO-OFDM-SDMA Systems with Peak Cancellation

  • 多素子 MIMO 上り回線チャネル推定のための周波数領域と遅延時間領域のパイロット割当に関する検討

    #神渡俊介, #松崎洸貴, @牟田 修

    電気・情報関係学会九州支部連合大会  2018.9 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大分大学   Country:Japan  

    A Study on Frequency-domain and Delay-time domain Pilot Allocations for Uplink Channel Estimation in Massive MIMO Systems

  • ピークキャンセラ適用時の多素子MIMO-OFDM-SDMAシステムのビット誤り率評価 (2)

    #景山知哉, #田添 諒, @牟田 修

    電気・情報関係学会九州支部連合大会  2018.9 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    Bit Error Rate Evaluation of massive MIMO-OFDM-SDMA Systems with Peak Cancellation, Part II

  • ピークキャンセラ適用時の多素子MRC-Precoded MIMO-SDMAのBER特性評価

    #景山知哉, @牟田修

    電子情報通信学会ソサイエティ大会  2018.9 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    BER Evaluation of MRC-Precoded MIMO-SDMA with Peak Cancellation

  • A Competition based Power Allocation Scheme for Downlink NOMA HetNet

    #Ahmed Nasser, @Osamu Muta

    電子情報通信学会ソサイエティ大会  2018.9 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:金沢大学   Country:Japan  

    A Competition based Power Allocation Scheme for Downlink NOMA HetNet

  • Pilot Allocation for Interference Coordination in Two-tier Massive MIMO Heterogeneous Network International conference

    @Hao Wanming, #Osamu Muta, #Haris Gacanin

    IEEE Vehicular Technology Conference 2018 Spring  2018.6 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Porte   Country:Portugal  

  • Capacity-Based Opportunistic User Selection for Downlink Interference Alignment in MU-MIMO Cellular Systems

    #Ahmed Benaya, @Maha Elsabrouty, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2018.5 

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    Event date: 2018.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学   Country:Japan  

    Capacity-Based Opportunistic User Selection for Downlink Interference Alignment in MU-MIMO Cellular Systems

  • MRCプリコーディングを用いるOFDM-SDMAシステムにおけるピークキャンセラ適用時のビット誤り率評価に関する検討

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2018.4 

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    Event date: 2018.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:湯田温泉   Country:Japan  

  • An Enhanced Selected Mapping Technique for Joint PAPR Reduction and Impulsive Noise Suppression in Multi-Carrier Powerline Communications Systems International conference

    #Tomoya Kageyama, @Osamu Muta, @Haris Gacanin

    IEEE International Symposium on Power Line Communications and its Applications  2018.4 

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    Event date: 2018.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Manchester   Country:United Kingdom  

    An Enhanced Selected Mapping Technique for Joint PAPR Reduction and Impulsive Noise Suppression in Multi-Carrier Powerline Communications Systems

  • マルチキャリア電力線通信における選択マッピングに基づくPAPR低減とインパルス性雑音抑圧に関する検討

    @景山知哉, #牟田 修

    電子情報通信学会 総合大会,  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京電機大学   Country:Japan  

  • A Study on Dynamic Small Cell Base Station Clustering in Ultra-Dense Heterogeneous Networks

    #Hao Wanming, @Osamu Muta,

    電子情報通信学会 総合大会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京電機大学   Country:Japan  

  • 多素子MIMOシステムにおける周波数と遅延時間領域の2次元パイロット割当を用いる上り回線チャネル推定に関する一検討(2)

    #松崎洸貴, @牟田修, @Haris Gacanin

    電子情報通信学会 総合大会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京電機大学   Country:Japan  

  • Weighted Rank Constrained Rank Minimization IA for 3-Tier Downlink HetNets

    @Ahmed Benaya, #Maha Elsabrouty, #Osamu Muta

    電子情報通信学会 総合大会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京電機大学   Country:Japan  

  • 多素子MIMOシステムにおける周波数と遅延時間領域の2次元パイロット割当を用いる上り回線チャネル推定に関する検討(2)

    #松崎洸貴, @牟田 修

    電子情報通信学会 通信方式研究会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Weighted Rank Constrained Rank Minimization Interference Alignment for 3-Tier Downlink Heterogeneous Networks

    #Ahmed Benaya, Maha Elsabrouty, @Osamu Muta

    電子情報通信学会 通信方式研究会  2018.3 

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    Event date: 2018.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

    Weighted Rank Constrained Rank Minimization Interference Alignment for 3-Tier Downlink Heterogeneous Networks

  • マルチキャリア電力線通信におけるインパルス性雑音の検出確率および誤警報確率の解析

    #景山知哉, @牟田 修

    電子情報通信学会 通信方式研究会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Performance of Massive MIMO Cognitive Radio Networks With Pilot Sharing Under SINR Requirements of Primary Users

    #Hao Wanming, @Osamu Muta

    電子情報通信学会 無線通信システム研究会  2018.3 

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    Event date: 2018.2 - 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

    Performance of Massive MIMO Cognitive Radio Networks With Pilot Sharing Under SINR Requirements of Primary Users

  • MIMO-OFDMシステムにおけるピークキャンセラのピーク検出閾値選択法とその特性評価(2) Invited

    #景山知哉, @牟田 修

    電子情報通信学会 無線通信システム研究会  2018.2 

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    Event date: 2018.2 - 2018.3

    Language:Japanese  

    Venue:横須賀リサーチパーク   Country:Japan  

    Peak detection threshold selection method and its achievable performance for peak cancellation in MIMO-OFDM systems, Part. II

  • Price-based Pilot Sharing for Spectrum Sharing Massive MIMO Networks

    @Hao Wanming, #Osamu Muta

    電子情報通信学会 通信方式研究会  2018.1 

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    Event date: 2018.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛大学   Country:Japan  

  • Dynamic Autonomous Frequency Reuse for Uplink Cellular Networks International conference

    #Mohamed Elwekeil, #Masoud Alghoniemy, #Osamu Muta

    International Conference on Consumer Electronics  2018.1 

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    Event date: 2018.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • OQAM-OFDM信号の部分スクランブルSLMに基づくPAPR低減の検討

    景山知哉, 岡部俊輝, 牟田 修

    電子情報通信学会 通信方式研究会  2017.12 

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    Event date: 2017.11 - 2017.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • Performance Evaluation of Centralized Massive MIMO Heterogeneous Network using Dynamic Small-cell Base Station Clustering

    Wanming Hao, 牟田 修

    電子情報通信学会 通信方式研究会  2017.12 

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    Event date: 2017.11 - 2017.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • A Study on Uplink Pilot Allocation for massive MIMO Cellular Systems

    Wanming Hao, 牟田 修

    電子情報通信学会 通信方式研究会  2017.11 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:阿蘇プラザホテル   Country:Japan  

  • [依頼講演] ピークキャンセラを適用したMIMO-OFDMの性能評価に関する検討

    牟田 修

    電子情報通信学会 無線通信システム研究会  2017.11 

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡大学   Country:Japan  

  • A Study on Small-cell Base Station Clustering for Heterogeneous Centralized Small-cell Network

    Wanming Hao, 牟田 修

    電子情報通信学会 無線通信システム研究会  2017.11 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福岡大学   Country:Japan  

  • Downlink Throughput Performance Evaluation of Massive MIMO Heterogeneous Centralized Network with Fronthaul Capacity and Transmission Power Constraints

    Wanming Hao, 牟田 修

    電子情報通信学会 無線通信システム研究会  2017.11 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福岡大学   Country:Japan  

  • Wireless Spoofing-Attack Prevention Using Radio-Propagation Characteristics International conference

    Mihiro Sonoyama, Takatsugu Ono, Osamu Muta, Inoue Koji, 金谷 晴一

    2017 IEEE 15th Intl Conf on Dependable, Autonomic and Secure Computing  2017.11 

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    Event date: 2017.11

    Language:English  

    Venue:Orlando   Country:United States  

  • Wireless Spoofing-Attack Prevention Using Radio-Propagation Characteristics International conference

    @Mihiro Sonoyama, #Takatsugu Ono, #Osamu Muta, #Haruichi Kanaya, #Koji Inoue

    2017 IEEE 15th Intl Conf on Dependable, Autonomic and Secure Computing  2017.11 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Weighted Fast Iterative Shrinkage Thresholding for 3D Massive MIMO Channel Estimation International conference

    Ahmed Nasser, Maha Elsabrouty, Osamu Muta

    IEEE PIMRC2017  2017.10 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • Pilot Allocation for Multi-Cell TDD Massive MIMO Systems International conference

    Hao Wanming, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    IEEE Vehicular Technology Conference 2017-Fall  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Toronto   Country:Canada  

  • 多素子MIMOシステムにおける周波数と遅延時間領域の2次元パイロット割当を用いる上り回線チャネル推定に関する一検討

    松崎洸貴, 牟田 修, Haris Gacanin

    電子情報通信学会 ソサイエティ大会  2017.9 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学   Country:Japan  

  • A Study on Pilot Allocation for Multi-Cell TDD Massive MIMO Networks

    Wanming Hao, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京都市大学   Country:Japan  

  • A Cooperative Wavelet based Compressive Wideband Spectrum Sensing Technique

    Osama Elnahas, Maha Elsabrouty, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京都市大学   Country:Japan  

  • 適応ピークキャンセラを適用したMIMO-OFDMシステムのピーク検出閾値選択手法に関する検討

    景山知哉, 牟田 修

    電子情報通信学会 ソサイエティ大会  2017.9 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都市大学   Country:Japan  

  • A Study on Resource Allocation in Massive MIMO Heterogeneous Centralized Radio Access Network with Limited Backhaul/Fronthaul Capacity

    Wanming Hao, 牟田 修

    電子情報通信学会 通信方式研究会  2017.9 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • マルチキャリア電力線通信における選択マッピングとブランキングを用いるインパルス性雑音抑圧方式~実測チャネルデータを用いた特性評価~

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2017.9 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • An Interference Graph-based Dynamic Small Cell Clustering Scheme for Interference Coordination in Massive MIMO Heterogeneous Network

    Wanming Hao, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 コミュニケーションクオリティ研究会  2017.8 

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    Event date: 2017.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京理科大学   Country:Japan  

  • Cooperative Wavelet based Compressive Wideband Spectrum Sensing over Frequency-Selective Channels, Part-II

    Osama Elnahas, Maha Elsabrouty, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2017.8 

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    Event date: 2017.8

    Language:English  

    Venue:新潟大学   Country:Japan  

  • マルチキャリア電力線通信におけるインパルス性雑音抑圧に関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2017.7 

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    Event date: 2017.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長崎県五島市   Country:Japan  

  • Performance Analysis on Uplink Pilot Allocation in TDD Massive MIMO Heterogeneous Networks

    Wanming Hao, 牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:長崎県五島市   Country:Japan  

    Performance Analysis on Uplink Pilot Allocation in TDD Massive MIMO Heterogeneous Networks

  • 2次元パイロット割当を用いる上り回線チャネル推定に関する検討

    松崎洸貴, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2017.7 

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    Event date: 2017.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長崎県五島市   Country:Japan  

  • Compressive Wideband Spectrum Sensing over Frequency-selective Channels

    Osama Elnahas, Maha Elsabrouty, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • An Analytical Framework for MIMO-OFDM systems with Adaptive Peak Amplitude Suppression Invited International conference

    Osamu Muta

    IEICE Information and Communication Technology Forum 2017  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Poznan   Country:Poland  

  • Using Repeated Game for Maximizing High Priority Data Trustworthiness in Wireless Sensor Networks International conference

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta

    The 22nd IEEE Symposium on Computers and Communications (ISCC2017)  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Crete   Country:Greece  

    Using Repeated Game for Maximizing High Priority Data Trustworthiness in Wireless Sensor Networks

  • An Effective Stackelberg Game for High-Assurance of Data Trustworthiness in WSNs International conference

    Mohamed S. Abdalzaher, Karim Seddik, Osamu Muta

    The 22nd IEEE Symposium on Computers and Communications (ISCC2017)  2017.7 

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    Event date: 2017.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Crete   Country:Greece  

    An Effective Stackelberg Game for High-Assurance of Data Trustworthiness in WSNs

  • [Encouragement Talk] A Study on Optimum Pilot Allocation for Multi-Cell TDD Massive MIMO Networks with Pilot Contamination

    Wanming Hao, 牟田 修, 古川 浩

    電子情報通信学会 コミュニケーションクオリティ研究会  2017.5 

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    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    A Study on Optimum Pilot Allocation for Multi-Cell TDD Massive MIMO Networks with Pilot Contamination

  • A Cooperative Wavelet based Compressive Sensing Technique for Wideband Spectrum Sensing

    Osama Elnahas, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2017.5 

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    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

    A Cooperative Wavelet based Compressive Sensing Technique for Wideband Spectrum Sensing

  • サイドローブスペクトル低減用のガード区間を付加したOFDMブロック伝送の特性評価

    田辺将之, 景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 コミュニケーションクオリティ研究会  2017.3 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • マルチキャリア電力線通信における選択マッピングとブランキング技術を用いるインパルス雑音抑圧方式の電力増幅器非線形歪み影響下での特性評価

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 コミュニケーションクオリティ研究会  2017.3 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • MIMO-OFDMシステムにおけるピークキャンセラのピーク検出閾値選択法とその特性評価

    景山知哉, 牟田 修

    電子情報通信学会 無線通信システム研究会  2017.3 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  • マルチキャリア電力線通信におけるチャネル推定適用時のインパルス性雑音抑圧に関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2017.2 

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    Event date: 2017.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:彦根勤労福祉会館   Country:Japan  

    A Study on Impulsive Noise Suppression for Multi-carrier Powerline Communication Systems with Channel Estimation

  • 適応ピークキャンセラを適用したOFDM信号のBER特性解析(2)

    景山知哉, 牟田 修

    電子情報通信学会 総合大会  2017.3 

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    Event date: 2017.1 - 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名城大学   Country:Japan  

    BER Analysis of OFDM Signals using Adaptive Peak Cancellation, Part II

  • A Study on Uplink Pilot-User Allocation Optimization for Multi-Cell TDD Massive MIMO Systems, Part II

    Wanming Hao, 牟田 修, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2016.12 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:金沢勤労者プラザ   Country:Japan  

    A Study on Uplink Pilot-User Allocation Optimization for Multi-Cell TDD Massive MIMO Systems, Part II

  • A Study on Uplink Pilot-User Allocation Optimization for Multi-Cell TDD Massive MIMO Systems

    Wanming Hao, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 無線通信システム研究会  2016.11 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:京都市国際交流会館   Country:Japan  

    A Study on Uplink Pilot-User Allocation Optimization for Multi-Cell TDD Massive MIMO Systems

  • PAPR低減用ピークキャンセラ適用時のQAM-OFDM伝送のBER解析

    牟田 修, 景山知哉

    電子情報通信学会 通信方式研究会  2016.11 

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    Event date: 2016.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道 函館市 KKRはこだて   Country:Japan  

    BER Analysis of QAM-OFDM Transmission in case using Peak Cancellation for PAPR Reduction

  • マルチキャリア電力線通信におけるブランキング技術を用いるインパルス性雑音抑圧に関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2016.9 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

    A Study and Performance Evaluation on Impulsive Noise Suppression for Multi-carrier Powerline Communications Systems

  • 適応ピークキャンセラを適用したOFDM信号のBER特性解析

    牟田 修, 景山知哉, Haris Gacanin

    電子情報通信学会 ソサイエティ大会  2016.9 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

  • ピークキャンセラを適用したOFDM電力線伝送におけるインパルス雑音下でのBER特性解析

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 ソサイエティ大会  2016.9 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

    BER analysis of OFDM based PLC systems using adaptive peak cancellation in presence of impulsive noise

  • マルチキャリア電力線通信における選択マッピングに基づくインパルス雑音検出に関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 コミュニケーションクオリティ研究会  2016.8 

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    Event date: 2016.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波山温泉   Country:Japan  

    A Study on Impulsive Noise Detection Based on Selected Mapping for Multicarrier Powerline Communication Systems

  • A Study on Pilot Allocation for Heterogeneous Network with Precoded Massive MIMO, Part II

    Wanming Hao, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 無線通信システム研究会  2016.8 

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    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:東北学院大学   Country:Japan  

    A Study on Pilot Allocation for Heterogeneous Network with Precoded Massive MIMO, Part II

  • A Study on Pilot Allocation for Heterogeneous Network with Precoded Massive MIMO

    Wanming Hao, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 無線通信システム研究会  2016.7 

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    Event date: 2016.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋工業大学   Country:Japan  

    A Study on Pilot Allocation for Heterogeneous Network with Precoded Massive MIMO

  • マルチキャリア電力線伝送用の適応ピークキャンセラに関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2016.7 

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    Event date: 2016.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:沖縄県宮古島市   Country:Japan  

    A Study on Adaptive Peak Cancellation for Multicarrier Power Line Communication

  • Adaptive Peak Cancellation and its Performance Analysis for MIMO-OFDM systems Invited

    牟田 修, 景山知哉, Haris Gacanin

    電子情報通信学会 通信方式研究会  2016.7 

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    Event date: 2016.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:沖縄県宮古島市   Country:Japan  

    Adaptive Peak Cancellation and its Performance Analysis for MIMO-OFDM systems

  • A Study on Optimum Pilot Allocation for Multi-Cell TDD Massive MIMO Systems

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 コミュニケーションクオリティ研究会  2016.5 

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    Event date: 2016.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Adaptive and Autonomous Frequency Reuse Algorithm for OFDMA Downlink Cellular Networks

    Mohamed Elwekeil, Masoud Alghoniemy, Osamu Muta, Adel Abdel-Rahman, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 コミュニケーションクオリティ研究会  2016.5 

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    Event date: 2016.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Energy-Efficient Resource Allocation for Cooperative Cognitive Radio Networks with Imperfect Spectrum Sensing

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2016.4 

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    Event date: 2016.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:弘前市・星と森のロマントピア   Country:Japan  

  • 適応ピークキャンセラ適用時のマルチキャリア伝送のBER特性解析

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2016.4 

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    Event date: 2016.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都 機械振興会館   Country:Japan  

  • 自己同期スクランブラを用いるSLMの設計手法に関する検討

    大木雄介, 牟田 修, 景山知哉, 古川 浩

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • Maxmin Optimization Model for Channel Assignment in Wireless LANs

    Mohamed Elwekeil, Osamu Muta, Masoud Alghoniemy, Adel Abdel-Rahman, Hiroshi Furukawa

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • OFDM用ピークキャンセラにおけるピーク検出閾値の選択に関する検討

    Osamu Muta, 景山知哉, Haris Gacanin

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • A Study on Pilot Resource Allocation for Spectrum Sharing Massive MIMO Systems

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • A Simplified Stackelberg Game Approach for Securing Data Trustworthiness in Wireless Sensor Networks

    Mohamed S. Abdalzaher, Osamu Muta, Karim Seddik, Adel Abdel-Rahman, Hiroshi Furukawa

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • MU-MIMO-OFDMシステムにおける適応ピークキャンセラの特性評価

    景山知哉, 大木雄介, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2016.3 

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    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • E-SDM-OFDMシステムにおける部分スクランブルSLMによるPAPR低減特性の評価

    大木雄介, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 通信方式研究会  2016.2 

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    Event date: 2016.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:ラフォーレ南紀白浜   Country:Japan  

  • OFDM信号用ピークキャンセラのピーク検出閾値選択に関する検討

    景山知哉, 牟田 修, Haris Gacanin

    電子情報通信学会 通信方式研究会  2016.2 

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    Event date: 2016.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:ラフォーレ南紀白浜   Country:Japan  

  • Energy-Efficient Resource Allocation in Sensing-Based Spectrum Sharing for Cognitive Cooperative Radio Networks

    Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2016.2 

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    Event date: 2016.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:ラフォーレ南紀白浜   Country:Japan  

  • Low Complexity Approach for Channel Assignment in Wireless LAN Networks

    Mohamed Elwekeil, Osamu Muta, Masoud Alghoniemy, Hiroshi Furukawa

    電子情報通信学会 コミュニケーションクオリティ研究会  2016.1 

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    Event date: 2016.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:筑波大学   Country:Japan  

    Low Complexity Approach for Channel Assignment in Wireless LAN Networks

  • Using Stackelberg Game to Enhance Node Protection in WSNs International conference

    Mohamed Abdalzaher, Karim Seddik, Osamu Muta, Adel Abdel Rahman

    13th Annual IEEE Consumer Communications and Networking Conference (CCNC2016)  2016.1 

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    Event date: 2016.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Las Vegas   Country:United States  

    Using Stackelberg Game to Enhance Node Protection in WSNs

  • Reduced Complexity K-Best Sphere Decoding Algorithms for Ill-Conditioned MIMO Channels International conference

    Ibrahim Al-Nahhal, Osamu Muta, Masoud Alghoniemy, Adel Abdel Rahman

    13th Annual IEEE Consumer Communications and Networking Conference (CCNC2016)  2016.1 

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    Event date: 2016.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Las Vegas   Country:United States  

    Reduced Complexity K-Best Sphere Decoding Algorithms for Ill-Conditioned MIMO Channels

  • 部分スクランブルSLMによるOFDM信号のピーク抑圧の検討

    牟田 修, 大木雄介, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.12 

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    Event date: 2015.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市総合コミュニティセンター   Country:Japan  

  • Maxmin Channel Assignment Optimization Model for Wireless LANs

    Mohamed Elwekeil, 牟田 修, Masoud Alghoniemy, Adel Abdel-Rahman, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.12 

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    Event date: 2015.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市総合コミュニティセンター   Country:Japan  

  • 部分スクランブルSLMによるOFDM信号のピーク抑圧の検討

    牟田 修, 大木雄介, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.12 

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    Event date: 2015.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山市総合コミュニティセンター   Country:Japan  

  • OFDM信号のPAPR低減用ピークキャンセラ適用時の帯域外歪み特性の評価

    景山知哉, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.10 

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    Event date: 2015.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横須賀リサーチパーク   Country:Japan  

  • E-SDM-OFDM信号のPAPR低減のための適応ピークキャンセラの特性評価

    景山知哉, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 ソサイエティ大会  2015.9 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • 無線バックホール用多サブキャリア数OFDM変調における周波数オフセット補償に関する検討

    小島優輝, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2015.9 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学   Country:Japan  

  • Perceptually Weighted Compressed Sensing for Images and Video Signals in Communications

    Sawsan Elsayed, Osamu Muta, Maha Elsabrouty, Hiroshi Furukawa

    電子情報通信学会 コミュニケーションクオリティ研究会  2015.9 

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    Event date: 2015.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:京都工芸繊維大学   Country:Japan  

    Perceptually Weighted Compressed Sensing for Images and Video Signals in Communications

  • An Adaptive Peak Cancellation Method for Linear-Precoded MIMO-OFDM Signals International conference

    Tomoya Kageyama, Osamu Muta, Haris Gacanin

    the 2015 IEEE 25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2015)  2015.8 

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    Event date: 2015.8 - 2015.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:HongKong   Country:China  

  • An Adaptive Peak Cancellation Method for Linear-Precoded MIMO-OFDM Signals International conference

    Tomoya Kageyama, Osamu Muta, Haris Gacanin

    the 2015 IEEE 25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2015)  2015.8 

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    Event date: 2015.8 - 2015.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:HongKong   Country:China  

  • マルチキャリア信号の適応ピーク振幅抑圧技術 Invited

    牟田 修

    電子情報通信学会 無線通信システム研究会  2015.8 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡大学   Country:Japan  

  • MIMOシステムにおけるピーク振幅を考慮した線形プリコーディングの検討

    大木雄介, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.8 

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    Event date: 2015.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡大学   Country:Japan  

  • 適応ピークキャンセラを用いるESDM-OFDM信号のピーク電力低減に関する検討 Invited

    景山知哉, 牟田 修, Haris Gacanin, 大木雄介, 古川 浩

    電子情報通信学会 通信方式研究会  2015.7 

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    Event date: 2015.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーフ情報プラザ(久米島)   Country:Japan  

  • 適応ピークキャンセラを用いるESDM-OFDM信号のピーク電力低減に関する検討 Invited

    景山知哉, 牟田 修, Haris Gacanin, 大木雄介, 古川 浩

    電子情報通信学会 通信方式研究会  2015.7 

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    Event date: 2015.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーフ情報プラザ(久米島)   Country:Japan  

  • 適応ピークキャンセラを用いるESDM-OFDM信号のピーク電力低減に関する検討 Invited

    景山知哉, 牟田 修, Haris Gacanin, 大木雄介, 古川 浩

    電子情報通信学会 通信方式研究会  2015.7 

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    Event date: 2015.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーフ情報プラザ(久米島)   Country:Japan  

  • 適応ピークキャンセラを用いるESDM-OFDM信号のピーク電力低減に関する検討 Invited

    景山知哉, 牟田 修, Haris Gacanin, 大木雄介, 古川 浩

    電子情報通信学会 通信方式研究会  2015.7 

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    Event date: 2015.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:イーフ情報プラザ(久米島)   Country:Japan  

  • Performance of Perceptual 1-Bit Compressed Sensing for Audio Compression International conference

    Hossam M. Kasem, Maha Elsabrouty,, Osamu Muta, Hiroshi Furukawa

    IEEE International Symposium on Computers and Communications 2015  2015.7 

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    Event date: 2015.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Cyprus  

  • Optimized Quantization and Scaling of Layered LDPC Scaled Min-sum Decoder International conference

    Ahmed Emran, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    IEEE International Symposium on Information Theory 2015  2015.6 

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    Event date: 2015.6 - 2014.6

    Language:English   Presentation type:Oral presentation (general)  

  • 無線バックホール用多サブキャリア数OFDM変調における周波数オフセット補償に関する検討

    小島優輝, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.5 

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    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:機会振興会館   Country:Japan  

    Study on frequency offset compensation for OFDM with large subcarrier size for wireless backhaul systems

  • Interference Alignment with Limited Feedback for Macrocell-Femtocell Heterogeneous Networks International conference

    Mohamed Rihan, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    IEEE Vehicular Technology Conference Spring 2015  2015.5 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Grasgow   Country:United Kingdom  

  • Cyclostationary Detection for Spectrum Sensing using Feature-Based Compressive Sensing

    Hossam Kasem, Osamu Muta, Maha Elsabrouty, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2015.5 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

  • Effect of Linearity Enhancement in A/D Conversion for Single Carrier Transmission Systems International conference

    Osamu Muta, Daisuke Kanemoto, Syota Fukushige, Hiroshi Furukawa

    IEEE Vehicular Technology Conference Spring 2015  2015.5 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Grasgow   Country:United Kingdom  

  • OFDM-SDMAシステムにおける帯域外輻射電力と帯域内歪みを考慮した適応ピークキャンセラの特性評価

    景山 知哉, 牟田 修, Haris Gacanin, 古川 浩

    電子情報通信学会 無線通信システム研究会  2015.4 

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    Event date: 2015.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:湯布院・湯布郷館   Country:Japan  

  • Optimized Quantization and Scaling of Layered LDPC Scaled Min-Sum Decoder,

    Ahmed A. Emran, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2015.4 

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    Event date: 2015.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福岡工業大学   Country:Japan  

  • Performance of Perceptual 1-Bit Compressed Sensing for Audio Compression in Digital Communication Systems

    Hossam Kasem,, Maha Elsabrouty, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2015.4 

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    Event date: 2015.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:福岡工業大学   Country:Japan  

  • E-SDM-OFDMシステムにおける帯域外輻射電力を考慮した適応ピークキャンセラの特性評価

    景山 知哉, Osamu Muta, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2015.3 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

  • E-SDM-OFDMシステムにおける帯域外輻射電力を考慮した適応ピークキャンセラの特性評価

    景山 知哉, Osamu Muta, Haris Gacanin, Hiroshi Frukawa

    電子情報通信学会 総合大会  2015.3 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:立命館大学   Country:Japan  

  • アンテナ毎のピーク電力を考慮した帰還型MIMOシステムの帰還ビット誤り影響下での特性評価

    大木 雄介, Osamu Muta, Hiroshi Frukawa

    電子情報通信学会 総合大会  2015.3 

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    Event date: 2015.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:立命館大学   Country:Japan  

  • Performance of 1-bit Compressed Sensing for Audio Compression under AWGN Channel

    Hossam Kasem, Osamu Muta, Maha Elsabrouty, Hiroshi Furukawa

    電子情報通信学会 総合大会  2015.3 

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    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:立命館大学   Country:Japan  

  • A Flexible Fractional K-best Sphere Decoding Algorithm for Uncoded MIMO Channels

    Ibrahim Al-Nahhal,, Ahmed Emran, Hossam Kasem, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 総合大会  2015.3 

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    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:立命館大学   Country:Japan  

  • ディジタル通信受信機へのヒステリシスA/D変換器の適用と特性評価

    福重 翔太, Osamu Muta, 兼本 大輔, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2015.2 

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    Event date: 2015.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取大学   Country:Japan  

  • The Effect of One-bit Compressed Sensing on Audio Compression for Digital Communication Systems

    Hossam M. Kasem, Osamu Muta, Maha Elsabrouty, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2015.2 

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    Event date: 2015.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:鳥取大学   Country:Japan  

  • A peak limiter based PAPR reduction technique under restrictions of out-of-band radiation and in-band distortion for OFDM Signals

    Muta Osamu, Tomoya Kageyama, Takaya Hino, Haris Gacanin, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.12 

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    Event date: 2014.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:伊勢市観光文化会館(三重)   Country:Japan  

    A peak limiter based PAPR reduction technique under restrictions of out-of-band radiation and in-band distortion for OFDM Signals

    Other Link: http://www.ieice.org/ken/paper/20141219oBUL/eng/

  • Activities on Microwave Education and Research between Japan and Egypt, -- Partnership between Kyushu University, Japan and Egypt-Japan University of Science and Technology, Egypt --

    Ramesh Kumar Pokharel, Muta Osamu, Ahmed Allam, Keiji Yoshida

    電子情報通信学会 マイクロ波研究会  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:長崎大学 文教キャンパス 工学部サイエンス・テクノラボ棟セミナー室2   Country:Japan  

    Activities on Microwave Education and Research between Japan and Egypt, -- Partnership between Kyushu University, Japan and Egypt-Japan University of Science and Technology, Egypt --

    Other Link: http://www.ieice.org/ken/paper/20141121QBtK/eng/

  • Performance Evaluation of OQAM Based OFDM Systems Using an ACLR and EVM Restricted Peak Amplitude Cancellation Scheme International conference

    Takaya Hino, Muta Osamu, Hiroshi Furukawa

    IEEE International Conference on Communication Systems 2014  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Macau   Country:China  

    Performance Evaluation of OQAM Based OFDM Systems Using an ACLR and EVM Restricted Peak Amplitude Cancellation Scheme

    Other Link: http://www.ieee-iccs.org/2014/

  • Performance of an E-SDM/FDD System Using an Iterative Weight Optimization and Control Algorithm International conference

    Yusuke Oki, Muta Osamu, Hiroshi Furukawa

    IEEE International Conference on Communication Systems 2014  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Macau   Country:China  

    Performance of an E-SDM/FDD System Using an Iterative Weight Optimization and Control Algorithm

    Other Link: http://www.ieee-iccs.org/2014/

  • Chunk-based Resource Allocation in Multi-Cell OFDMA Systems with fairness guarantee

    Mahmoud M. Selim, Muta Osamu, Hossam Shalaby, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:山形大学 米沢キャンバス   Country:Japan  

    Chunk-based Resource Allocation in Multi-Cell OFDMA Systems with fairness guarantee

    Other Link: http://www.ieice.org/ken/paper/20141112QBTJ/

  • Energy-Efficient Design for TDBC-Based Two-Way Relay Network with Weighted Fairness International conference

    Basem M. ElHalawany, Muta Osamu, Maha Elsabrouty, Hiroshi Furukawa

    The 3rd International Conference on Connected Vehicles & Expo (ICCVE 2014)  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Macau   Country:China  

    Energy-Efficient Design for TDBC-Based Two-Way Relay Network with Weighted Fairness

    Other Link: http://www.iccve.org/

  • Fairness aware Chunk-Based Resource Allocation in Multi-Cell OFDMA Networks International conference

    Mahmoud M. Selim, Muta Osamu, Hossam Shalaby, Hiroshi Furukawa

    The 3rd International Conference on Connected Vehicles & Expo (ICCVE 2014)  2014.11 

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    Event date: 2014.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Macau   Country:China  

    Fairness aware Chunk-Based Resource Allocation in Multi-Cell OFDMA Networks

    Other Link: http://www.iccve.org/

  • Interference Alignment with Limited Feedback on Macrocell-Femtocell Two-Tier Heterogeneous Networks Invited

    Mohamed Rihan, Maha Elsabrouty, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.10 

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    Event date: 2014.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 日吉キャンパス 来往舎   Country:Japan  

    Interference Alignment with Limited Feedback on Macrocell-Femtocell Two-Tier Heterogeneous Networks

    Other Link: http://www.ieice.org/ken/paper/20141017YBrg/

  • A Study on A Reduced Complexity Sub-carrier Allocation Approach in MISO-OFDMA Systems with QoS Provision Invited

    Mahmoud M. Selim, Muta Osamu, Hossam M. H. Shalaby, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.10 

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    Event date: 2014.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 日吉キャンパス 来往舎   Country:Japan  

    A Study on A Reduced Complexity Sub-carrier Allocation Approach in MISO-OFDMA Systems with QoS Provision

    Other Link: http://www.ieice.org/ken/paper/20141016QBrG/

  • シングルキャリア伝送におけるコンパレータヒステリシスを考慮したA/D変換器の非線形歪み軽減手法と特性評価

    福重 翔太, 牟田 修, 兼本大輔, 古川 浩

    電子情報通信学会 無線通信システム研究会  2014.10 

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    Event date: 2014.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 日吉キャンパス 来往舎   Country:Japan  

    A Linearity Enhancement Technique and Its Performance Evaluation for A/D Converter Affected by Comparator Hysteresis in Single Carrier Transmission

    Other Link: http://www.ieice.org/ken/paper/20141017uBrH/

  • 無線通信受信機用A/D変換器における非線形歪みの軽減手法に関する検討

    福重 翔太, 牟田 修, 兼本大輔, 古川 浩

    電子情報通信学会ソサイエティ大会  2014.9 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

    送信電力増幅器の電力効率を改善するには,その入出力特性の線形性を高めることに加えて,ピーク電力対平均電力比(PAPR) の低い変調方式を用いることが重要である。また, 受信機アナログ回路の回路規模を軽減するには,A/D 変換器(ADC) を簡素化することが有効である。本論文では, PAPR の低いオフセットQAM(OQAM) を評価対象として, 受信機における低分解能A/D 変換器の非線形歪みの影響を軽減する手法として, ディザ信号およびヒステリシス効果を応用したA/D 変換技術を提案し,OQAM伝送システムにおいて低分解能ディザADC およびヒステリシスADC を用いた場合のBER特性を評価し, その有効性を確認した。

  • 帯域外輻射および帯域内歪み制約下でのOFDMA信号のピーク振幅抑圧の検討

    景山知哉, 牟田 修, 兼本大輔, 古川 浩

    電子情報通信学会 ソサイエティ大会  2014.9 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

    OFDM に代表されるマルチキャリア変調システムでは,送信信号のピーク対平均電力比(PAPR) を低減することが課題の一つとなる.著者等は,帯域外漏洩電力(ACLR)および帯域内歪み電力(EVM) を許容値以下に抑えながら,送信信号のPAPR を低減する適応ピークキャンセラを提案した.ところで,OFDMA システムにおいて各ユーザーが異なる変調方式を用いる場合,ユーザー毎に歪み電力の許容量が異なるため,それを考慮したPAPR 低減が必要となる.本検討では,提案方式をOFDMA 方式に拡張し,各ユーザーが異なる変調方式を用いる場合にも適用可能であることを計算機シミュレーション結果により示す.

  • アンテナ素子当たりの最大送信電力が制限されたMIMOシステムにおける帰還型送信重み制御手法の検討

    大木雄介, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2014.9 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島大学 常三島キャンパス   Country:Japan  

    送受信空間フィルタを用いるMIMO空間分割多重伝送において, 各アンテナ素子から送信可能な電力(送信ピーク電力)が制限された場合の送信重み制御手法を示した. 本論文では, 上下回線間での伝搬路相関が低いFDDシステムを仮定し, 下り回線における伝搬路変化量を上り回線において周期的に帰還する方式,及び受信機側で求めた送信重みの差分情報を帰還する方式について比較検討を行う. アンテナ素子毎の最大出力を考慮したMIMOシステムに検討方式を適用した場合の送信ピーク電力特性および帰還ビット誤り影響下での伝送特性を示す.

  • Wide-Band Cooperative Compressive Spectrum Sensing for Cognitive Radio Systems Using Distributed Sensing Matrix Invited International conference

    Mohammed Farrag, Muta Osamu, Mostafa El-Khamy, Hiroshi Furukawa, Mohamed El-Sharkawy

    IEEE Vehicular Technology Conference Fall 2014  2014.9 

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    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Vancouver   Country:Canada  

    Wide-Band Cooperative Compressive Spectrum Sensing for Cognitive Radio Systems Using Distributed Sensing Matrix

    Other Link: http://www.ieeevtc.org/vtc2014fall/

  • アンテナ毎のピーク出力を考慮した帰還型MIMOシステムにおける帰還ビット誤り影響下での送信重み制御手法に関する検討

    大木 雄介, Osamu Muta, Hiroshi Frukawa

    電子情報通信学会 コミュニケーションクオリティ研究会  2014.9 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:宮城県石巻市   Country:Japan  

  • A Peak Power Aware Linear-Precoding Scheme for MIMO-SDM Systems Invited International conference

    Satoshi Takabatake, Muta Osamu, Hiroshi Furukawa

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2014  2014.9 

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    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington   Country:United States  

    A Peak Power Aware Linear-Precoding Scheme for MIMO-SDM Systems

    Other Link: http://www.ieee-pimrc.org/2014/PIMRC%202014%20FP.pdf

  • A Maxmin Model for Solving Channel Assignment Problem in IEEE 802.11 Networks Invited International conference

    Mohamed Elwekeil, Masoud Alghoniemy, Muta Osamu, Adel Abdel Rahman, Hiroshi Furukawa, Haris Gacanin

    The 2014 European Signal Processing Conference (EUSIPCO 2014),  2014.9 

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    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Lisbon   Country:Portugal  

    A Maxmin Model for Solving Channel Assignment Problem in IEEE 802.11 Networks

    Other Link: http://www.eusipco2014.org/program/

  • Iterative Interference Alignment in Macrocell-Femtocell Networks, A Cognitive Radio Approach Invited International conference

    Mohamed Rihan, Maha Elsabrouty, Muta Osamu, Hiroshi Furukawa

    International Symposium on Wireless Communication Systems (ISWCS2014)  2014.8 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Barcelona   Country:Spain  

    Iterative Interference Alignment in Macrocell-Femtocell Networks, A Cognitive Radio Approach

    Other Link: http://www.iswcs2014.org/

  • A Study on Downlink Interference Mitigation Based on Interference Alignment for Coexisting MIMO Femtocell and Macrocell Networks affected by Heterogeneous Pathloss and Shadowing

    Mohamed Rihan Emam Elmeligy, Maha Elsabrouty, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.8 

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    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:高知市文化プラザかるぽーと   Country:Japan  

    A Study on Downlink Interference Mitigation Based on Interference Alignment for Coexisting MIMO Femtocell and Macrocell Networks affected by Heterogeneous Pathloss and Shadowing

    Other Link: http://www.ieice.org/ken/paper/20140820UBQ9/eng/

  • IFサンプリング1bitA/D変換方式を採用した無線受信機の構成検討と試作による評価

    兼本大輔, 牟田 修, 古川 浩, 金谷 晴一, 大木 真

    第27回 回路とシステムワークショップ  2014.8 

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    Event date: 2014.8 - 2012.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:淡路夢舞台国際会議場   Country:Japan  

    本論文では, IFサンプリング1bitA/D変換方式を採用した 無線受信機の構成検討と実測結果に関して考察を行っている. 検討システムでは, 定包絡線変調に適した安価でかつ低消費電力動作が 見込める1bit 分解能A/D 変換器を利用した.また伝播路や1bit分解能 A/D変換器で発生する通信路の悪化を,修正MLSE等化を行う事で 改善している.実際に1bit分解能A/D変換器を試作し,得られた 測定結果に基づきBER 特性を評価した.

  • A Study on Interference Mitigation Framework Based on Interference Alignment for Femtocell-Macrocell Two Tier Cellular Systems

    Mohamed Rihan Emam Elmeligy, Maha Elsabrouty, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.7 

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    Event date: 2014.7 - 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:京都テルサ   Country:Japan  

    A Study on Interference Mitigation Framework Based on Interference Alignment for Femtocell-Macrocell Two Tier Cellular Systems

    Other Link: http://www.ieice.org/ken/paper/20140731qBPi/eng/

  • 適応ピークキャンセラを用いたMIMO-OFDM信号のピーク電力低減に関する検討(2)

    日野 貴哉, 牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2014.7 

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    Event date: 2014.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:南種子町商工会会議室   Country:Japan  

    A Study on PAPR Reduction Based on Adaptive Peak Amplitude Cancellation for MIMO-OFDM Signals, Part II

    Other Link: http://www.ieice.org/ken/paper/20140704lBpB/eng/

  • 空間分割多重伝送におけるアンテナ素子当りの最大出力を考慮した送信重み制御手法の検討(3)

    大木 雄介, 牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2014.7 

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    Event date: 2014.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:南種子町商工会会議室   Country:Japan  

    A Study on PAPR Reduction Based on Adaptive Peak Amplitude Cancellation for MIMO-OFDM Signals, Part II

    Other Link: http://www.ieice.org/ken/paper/201407045Bp0/eng/

  • Joint Energy-Efficient Single Relay Selection and Power Allocation for Analog Network Coding with Three Transmission Phases International conference

    Basem M. ElHalawany, Maha Elsabrouty, Muta Osamu, Adel Abdelrahman, Furukawa Hiroshi

    IEEE Vehicular Technology Conference Spring 2014  2014.5 

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    Event date: 2014.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Seoul   Country:Korea, Republic of  

    Joint Energy-Efficient Single Relay Selection and Power Allocation for Analog Network Coding with Three Transmission Phases

  • A Distributed Relay Beamforming Scheme for Fairness-Aware Bi-directional Amplify-and-Forward Relaying under Correlated Relays Noise

    Basem M. ElHalawany, Maha Elsabrouty, Muta Osamu, Adel Abdelrahman, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.5 

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    Event date: 2014.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

    A Distributed Relay Beamforming Scheme for Fairness-Aware Bi-directional Amplify-and-Forward Relaying under Correlated Relays Noise

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • An Area Spectral Efficiency Comparison of Downlink Different Frequency Reuse Schemes in MIMO Heterogeneous Networks

    Sherief Hashima, Muta Osamu, Masoud Alghonimey, Hossam Shalaby, Hiroshi Furukawa, Said Elnoubi, Imbaby Mahmoud

    電子情報通信学会 無線通信システム研究会  2014.5 

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    Event date: 2014.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:機械振興会館   Country:Japan  

    An Area Spectral Efficiency Comparison of Downlink Different Frequency Reuse Schemes in MIMO Heterogeneous Networks

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • Area Spectral Efficiency Performance Comparison of Downlink Fractional Frequency Reuse Schemes for MIMO Heterogeneous Networks International conference

    Sherief Hashima, Muta Osamu, Said Elnoubi, Masoud Alghonimey, Hossam Shalaby, Hiroshi Furukawa

    Electronics and Electrical Engineering (ISEEE 2014)  2014.4 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:札幌プリンスホテル   Country:Japan  

    Area Spectral Efficiency Performance Comparison of Downlink Fractional Frequency Reuse Schemes for MIMO Heterogeneous Networks

    Other Link: http://www.iseee.org/ISEEE2014-ConferenceProgram.pdf

  • Zero-Forcing Relay Power Allocation for TDBC-Based Bidirectional Relay Networks International conference

    Basem M. ElHalawany, Maha Elsabrouty, Muta Osamu, Adel Abdelrahman, Hiroshi Furukawa

    Electronics and Electrical Engineering (ISEEE 2014)  2014.4 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:札幌プリンスホテル   Country:Japan  

    Zero-Forcing Relay Power Allocation for TDBC-Based Bidirectional Relay Networks

    Other Link: http://www.iseee.org/ISEEE2014-ConferenceProgram.pdf

  • Analysis and Comparison of Fractional Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Uplink International conference

    Sherief Hashima, Muta Osamu, Said Elnoubi, Masoud Alghonimey, Hossam Shalaby, Hiroshi Furukawa

    Wireless Telecommunications Symposium (WTS) 2014  2014.4 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington.D.C   Country:United States  

    Analysis and Comparison of Fractional Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Uplink

    Other Link: http://www.csupomona.edu/~wtsi/index.html

  • Distributed Relay Beamforming for Fairness-Aware Amplify-and-Forward Relaying under Correlated Relays Noise International conference

    Basem M. ElHalawany, Maha Elsabrouty, Muta Osamu, Adel Abdelrahman, Hiroshi Furukawa

    Wireless Telecommunications Symposium (WTS) 2014  2014.4 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Washington, D.C.   Country:United States  

    Distributed Relay Beamforming for Fairness-Aware Amplify-and-Forward Relaying under Correlated Relays Noise

    Other Link: http://www.csupomona.edu/~wtsi/index.html

  • アンテナ素子当たりの最大送信電力が制限されたMIMOシステムにおける送信重み制御手法の検討

    髙畠 聖, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2013.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学   Country:Japan  

  • 帯域外漏洩電力制約下でのQAM-OFDM信号のピーク振幅抑圧の検討

    日野 貴哉, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2014.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟大学   Country:Japan  

    A Study on Peak Amplitude Suppression of Multi-Carrier Signals under Restriction of Out-of-Band Radiation Power

  • A Zero-Forcing Relay Power Allocation Scheme for TDBC-Based Bidirectional Relay Networks

    Basem M. ElHalawany, Maha Elsabrouty, Adel Abdelrahman, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2014.3 

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    Event date: 2014.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学   Country:Japan  

    A Zero-Forcing Relay Power Allocation Scheme for TDBC-Based Bidirectional Relay Networks

    Other Link: http://www.ieice.org/ken/program/index.php?tgs_regid=9163733f172a87a3fef92da65a35188d5ac0c7a2f6c673ecafb873282ea6fa2e&tgid=IEICE-CS

  • Wide-Band Cooperative Compressive Spectrum Sensing Using Distributed Sensing Matrix for Cognitive Radio Systems

    Mohammed Farrag, Muta Osamu, Mostafa El-Khamy, Hiroshi Furukawa, Mohamed El-Sharkawy

    電子情報通信学会 無線通信システム研究会  2013.3 

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    Event date: 2014.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学   Country:Japan  

    Wide-Band Cooperative Compressive Spectrum Sensing Using Distributed Sensing Matrix for Cognitive Radio Systems

    Other Link: http://www.ieice.org/ken/program/index.php?tgs_regid=9163733f172a87a3fef92da65a35188d5ac0c7a2f6c673ecafb873282ea6fa2e&tgid=IEICE-CS

  • 空間分割多重伝送におけるアンテナ素子当たりの最大出力を考慮した送信重み制御手法の検討(1)

    髙畠 聖, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2013.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学   Country:Japan  

    A Study on transmit weight control considering per-antenna maximum transit power in space division multiplexing transmission(1)

    Other Link: http://www.ieice.org/ken/paper/201403061Bl8/eng/

  • 空間分割多重伝送におけるアンテナ素子当たりの最大出力を考慮した送信重み制御手法の検討(2) -時変伝搬路における帰還型制御適用時の特性評価-

    大木 雄介, 髙畠 聖, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2013.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学   Country:Japan  

    A study on transmit weight control considering per-antenna maximum transit power in space division multiplexing transmission(2) -- Performance evaluation in case with feedback-type weight controls for time-varying channels --

    Other Link: http://www.ieice.org/ken/paper/20140306RBl8/eng/

  • 1bit分解能A/D変換器を用いた無線機の検討

    兼本 大輔, 牟田 修, 古川 浩, 佐藤 隆英, 大木 真

    電気学会 電子回路研究会  2013.3 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神奈川大学 横浜キャンパス 23号館203教室   Country:Japan  

  • Performance Comparison of Relay Power Allocation Schemes with Single Relay Selection for Energy-Efficient Bidirectional Relay Networks with TDBC Protocol

    Basem M. ElHalawany, Maha Elsabrouty, Adel Abdelrahman, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.3 

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    Event date: 2014.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:早稲田大学 西早稲田キャンパス 63号館   Country:Japan  

    Performance Comparison of Relay Power Allocation Schemes with Single Relay Selection for Energy-Efficient Bidirectional Relay Networks with TDBC Protocol

    Other Link: http://www.ieice.org/ken/paper/201403037B9S/eng/

  • Effects of MLSE Equalization for Constant Envelope Modulation Signals Affected by ADC Nonlinearity International conference

    Ryuta Fukunaga, Osamu Muta, Hiroshi Frukawa

    The 28th edition of the International Conference on Information Networking (ICOIN2014)  2014.2 

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    Event date: 2014.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Phuket   Country:Thailand  

    Effects of MLSE Equalization for Constant Envelope Modulation Signals Affected by ADC Nonlinearity

    Other Link: http://2014.icoin.org/data/ICOIN_2014_Program_v4_9.pdf

  • Reduced Complexity QoS aware Resource Allocation Technique for MISO-OFDMA Systems International conference

    Mahmoud M. Selim, Said M. Elnoubi, Hossam Shalaby, Muta Osamu, Hiroshi Furukawa

    International Conference on Computing, Networking, and Communications (ICNC2014 workshop)  2014.2 

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    Event date: 2014.2 - 2012.2

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Honolulu, Hawaii   Country:United States  

    Reduced Complexity QoS aware Resource Allocation Technique for MISO-OFDMA Systems

    Other Link: http://www.conf-icnc.org/2014/

  • 帯域外輻射電力制約下でのマルチキャリア信号のピーク振幅抑圧に関する検討(2)

    日野 貴哉, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2014.1 

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    Event date: 2014.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 稲盛財団記念館   Country:Japan  

    A Study on Peak Amplitude Suppression of Multi-Carrier Signals under Restriction of Out-of-Band Radiation Power, Part II

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • Analysis and Comparison of Fractional Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Uplink

    Sherief Hashima, Muta Osamu, Said M. Elnoubi, Masoud Alghoniemy, Hiroshi Furukawa, Hossam Shalaby, Imbaby Mahmoud

    電子情報通信学会 無線通信システム研究会  2014.1 

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    Event date: 2014.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学 稲盛財団記念館   Country:Japan  

    Analysis and Comparison of Fractional Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Uplink

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • Performance of Single Relay Selection Scheme for Energy-Efficient TDBC-Based Bidirectional Relay Networks

    Basem M. ElHalawany, Maha Elsabrouty, Adel Abdelrahman, Muta Osamu, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2014.1 

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    Event date: 2014.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:九州大学 稲盛財団記念館   Country:Japan  

    Performance of Single Relay Selection Scheme for Energy-Efficient TDBC-Based Bidirectional Relay Networks

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • Performance Analysis of Different Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Downlink

    Sherief Hashima, Muta Osamu, Said M. Elnoubi, Masoud Alghoniemy, Hossam Shalaby, Hiroshi Furukawa, Imbaby Mahmoud

    電子情報通信学会 無線通信システム研究会  2013.12 

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    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:高松市文化芸術ホール   Country:Japan  

    Performance Analysis of Different Frequency Reuse Schemes Based on Worst Case Signal to Interference Power Ratio in OFDMA Downlink

    Other Link: http://www.ieice.or.jp/cs/rcs/jpn/

  • Iterative Reweighted Least Squares Approach to Interference Alignment International conference

    Mohamed Rihan Elmeligy, Maha Elsabrouty, Said M. Elnoubi, Hossam Shalaby, Muta Osamu, Hiroshi Furukawa

    2013 IFIP Wireless Days Conference  2013.11 

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    Event date: 2013.11 - 2012.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Valencia   Country:Spain  

    Iterative Reweighted Least Squares Approach to Interference Alignment

    Other Link: http://www.wirelessdays.org/programme/DProgramme.html

  • 帯域外輻射電力制約下でのマルチキャリア信号のピーク振幅抑圧に関する検討

    日野 貴哉, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2013.10 

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    Event date: 2013.10 - 2012.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:上智大学 四谷キャンパス   Country:Japan  

    A Study on Peak Amplitude Suppression of Multi-Carrier Signals under Restriction of Out-of-Band Radiation Power

    Other Link: http://www.ieice.org/ken/paper/20131018oBgq/eng/

  • Performance Analysis of Uplink Fractional Frequency Reuse using Worst Case Signal to Interference Ratio International conference

    Sherief Hashima, Hossam Shalaby, Said M. Elnoubi, Masoud Alghoniemy, Muta Osamu, Hiroshi Furukawa

    Science and Information Conference 2013  2013.10 

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    Event date: 2013.10 - 2012.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Thistle Hotel   Country:United Kingdom  

    Performance Analysis of Uplink Fractional Frequency Reuse using Worst Case Signal to Interference Ratio

    Other Link: http://thesai.org/SAIConference2013

  • オフセットQAM信号に対する選択マッピングによるPAPR抑圧の効果

    日野 貴哉, 牟田 修, 古川 浩

    電気関係学会九州支部第66回連合大会  2013.9 

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    Event date: 2013.9 - 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • オフセットQPSK受信機におけるADC非線形歪みの軽減手法

    福重 翔太, 牟田 修, 兼本 大輔, 古川 浩

    電気関係学会九州支部第66回連合大会  2013.9 

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    Event date: 2013.9 - 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学   Country:Japan  

  • 帯域外漏洩電力制約下でのOFDM信号の包絡線ピーク振幅抑圧に関する検討

    日野 貴哉, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2013.9 

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    Event date: 2013.9 - 2012.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡工業大学   Country:Japan  

  • Performance Analysis of Fractional Frequency Reuse Based on Worst Case Signal to Interference Ratio in OFDMA Downlink Systems International conference

    Sherief Hashima, Hossam Shalaby, Said M. Elnoubi, Masoud Alghoniemy, Muta Osamu, Hiroshi Furukawa

    IEEE PIMRC 2013  2013.9 

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    Event date: 2013.9 - 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hilton London Metropole   Country:United Kingdom  

    Performance Analysis of Fractional Frequency Reuse Based on Worst Case Signal to Interference Ratio in OFDMA Downlink Systems

    Other Link: http://www.ieee-pimrc.org/index.html

  • Underlay MIMO Cognitive Transceivers Design with Channel Uncertainty International conference

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Muta Osamu, Hiroshi Furukawa

    IEEE PIMRC 2013  2013.9 

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    Event date: 2013.9 - 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hilton London Metropole   Country:United Kingdom  

    Underlay MIMO Cognitive Transceivers Design with Channel Uncertainty

    Other Link: http://www.ieee-pimrc.org/index.html

  • Analysis of Frequency Reuse Cellular Systems Using Worst Case Signal to Interference Ratio International conference

    Sherief Hashima, Said M. Elnoubi, Masoud Alghoniemy, Hossam Shalaby, Muta Osamu, Imbaby Mahmoud

    12th International conference on telecommunications  2013.6 

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    Event date: 2013.6 - 2012.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Zagreb   Country:Croatia  

    Analysis of Frequency Reuse Cellular Systems Using Worst Case Signal to Interference Ratio

    Other Link: http://www.contel.hr/2013/

  • 定包絡線変調受信機のための1bit量子化A/D変換器の構成と試作評価

    兼本大輔, 牟田 修, 福永龍太, 古川 浩, 金谷 晴一, 吉田 啓二

    電子情報通信学会 無線通信システム研究会  2013.4 

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    Event date: 2013.4 - 2012.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:石垣市民会館   Country:Japan  

    Hardware configuration and evaluation of one-bit quantization A/D converter for constant envelope modulation receivers

    Other Link: http://www.ieice.org/ken/paper/20130419SBDU/eng/

  • A Distributed Cooperative MIMO Secondary Transceivers Design for Overlay Cognitive Radio Systems

    Bassant Abdelhamid, Osamu Muta, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Hiroshi Frukawa

    電子情報通信学会 無線通信システム研究会  2013.4 

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    Event date: 2013.4 - 2012.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:石垣市民会館   Country:Japan  

    A Distributed Cooperative MIMO Secondary Transceivers Design for Overlay Cognitive Radio Systems

    Other Link: http://www.ieice.org/ken/paper/201304193BDH/eng/

  • 1bitADCを用いる無線シングルキャリア位相変調システムの伝送特性評価

    牟田 修, 兼本大輔, 福永龍太, 古川 浩

    電子情報通信学会 通信方式研究会  2013.3 

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    Event date: 2013.3 - 2012.3

    Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 鶴岡タウンキャンパス   Country:Japan  

    Performance Evaluation of Wireless Single Carrier Phase Modulation Systems Using 1bit ADC

    Other Link: http://www.ieice.org/ken/paper/20130315nB2G/eng/

  • Joint Optimization Design for Multiple Underlay MIMO Cognitive Transceivers with Channel Uncertainty

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Osamu Muta, and Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2013.3 

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    Event date: 2013.3 - 2012.3

    Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 鶴岡タウンキャンパス   Country:Japan  

    Joint Optimization Design for Multiple Underlay MIMO CognitiveTransceivers with Channel Uncertainty

    Other Link: http://www.ieice.org/ken/paper/20130315eB2d/eng/

  • 無線シングルキャリア位相変調信号に適した1bit A/D変換器の構成と性能評価

    兼本大輔, 牟田 修, 古川 浩, 金谷晴一, 吉田啓二

    電子情報通信学会 通信方式研究会  2013.3 

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    Event date: 2013.3 - 2012.3

    Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学 鶴岡タウンキャンパス   Country:Japan  

    Hardware configuration and evaluation of 1 bit A/D converter for wireless single carrier phase modulation signals

    Other Link: http://www.ieice.org/ken/paper/20130315kB2f/eng/

  • Joint Optimization Design for Underlay Cognitive Transceiver with Channel Uncertainty

    Bassant Abdelhamid, Maha Elsabrouty, Masoud Alghoniemy, Salwa Elramly, Osamu Muta, and Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2013.2 

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    Event date: 2013.1 - 2012.2

    Presentation type:Oral presentation (general)  

    Venue:広島県呉市 ビュー・ポートくれ   Country:Japan  

    Joint Optimization Design for Underlay Cognitive Transceiver with Channel Uncertainty

    Other Link: http://www.ieice.org/ken/paper/20130201PBBK/eng/

  • Lagrangian Relaxation Approach for Low Complexity Channel Assignment in Multi-Cell WLANs International conference

    Mohamed Elwekeil, Masoud Alghoniemy, Hiroshi Furukawa, and Osamu Muta

    Proc. ICNC Workshop on Computing, Networking and Communications  2013.1 

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    Event date: 2013.1 - 2012.1

    Presentation type:Oral presentation (general)  

    Venue:San Diego   Country:United States  

    Lagrangian Relaxation Approach for Low Complexity Channel Assignment in Multi-Cell WLANs

    Other Link: http://www.conf-icnc.org/2013/

  • Performance Evaluation of An Intelligent Directional Antenna System for Indoor Wireless Backhaul

    Ximing Huang, Osamu Muta, Kuninori Ohsaki, and Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2012.12 

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    Event date: 2012.12

    Presentation type:Oral presentation (general)  

    Venue:愛媛大学 城北キャンパス   Country:Japan  

    Performance Evaluation of An Intelligent Directional Antenna System Applied to Indoor Wireless Backhaul

    Other Link: http://www.ieice.org/ken/paper/20121214d0zM/eng/

  • 量子化雑音影響下におけるMIMO差動符号化GMSK適応等化方式の特性評価

    福永龍太, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2012.11 

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    Event date: 2012.11

    Presentation type:Oral presentation (general)  

    Venue:東京電機大学 東京千住キャンパス   Country:Japan  

    Performance Evaluation of Adaptive Equalization for MIMO Differential Encoded GMSK Signal Affected by Quantization Noise

    Other Link: http://www.ieice.org/ken/paper/20121116S0y4/eng/

  • 電力増幅器非線形歪み影響下のOFDMシステムにおけるPAPR低減のためのサブキャリア位相制御規範に関する検討

    高畠聖, 牟田修

    電気関係学会九州支部第65回連合大会  2012.9 

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    Event date: 2012.9

    Presentation type:Oral presentation (general)  

    Venue:長崎大学 文教キャンパス   Country:Japan  

  • MIMOシングルキャリアシステムにおけるE級電力増幅信号のモデル化とシミュレーション評価

    福永龍太, 山下勇輝, 牟田修, 兼本大輔, 金谷晴一, 吉田啓二, 古川 浩

    電気関係学会九州支部第65回連合大会  2012.9 

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    Event date: 2012.9

    Presentation type:Oral presentation (general)  

    Venue:長崎大学 文教キャンパス   Country:Japan  

  • MIMO-OFDMシステムにおける適応プレディストータとピークキャンセラを併用する電力増幅器の非線形歪み補償

    日野貴哉, 牟田修

    電気関係学会九州支部第65回連合大会  2012.9 

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    Event date: 2012.9

    Presentation type:Oral presentation (general)  

    Venue:長崎大学 文教キャンパス   Country:Japan  

  • 量子化雑音影響下でのGMSKシステムにおける差動符号化の効果

    福永龍太, 牟田修, 古川浩

    電子情報通信学会 ソサイエティ大会  2012.9 

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    Event date: 2012.9

    Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  • Adaptive Peak Power Cancellation Scheme under the Requirements of ACLR and EVM for MIMO-OFDM Systems International conference

    Takaya Hino, Osamu Muta

    Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2012 (PIMRC2012)  2012.9 

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    Event date: 2012.9

    Presentation type:Oral presentation (general)  

    Venue:Sydney   Country:Australia  

    Adaptive Peak Power Cancellation Scheme under the Requirements of ACLR and EVM for MIMO-OFDM Systems

  • Partial Scrambling PAPR Reduction for Multi-Code Vector Coding in Adaptive Modulated MIMO Systems International conference

    Osamu Muta

    Proc. OFDM workshop 2012  2012.8 

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    Event date: 2012.8

    Presentation type:Oral presentation (general)  

    Venue:Essen   Country:Germany  

    Partial Scrambling PAPR Reduction for Multi-Code Vector Coding in Adaptive Modulated MIMO Systems

  • Optimal Channel Assignment for IEEE 802.11 Multi-cell WLANs International conference

    Mohamed Elwekeil, Masoud Alghoniemy, Mostafa El-Khamy, Hiroshi Furukawa, and Osamu Muta

    Proc. 20th European Signal Processing Conference (EUSIPCO 2012)  2012.8 

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    Event date: 2012.8

    Presentation type:Oral presentation (general)  

    Venue:Bucharest   Country:Romania  

    Optimal Channel Assignment for IEEE 802.11 Multi-cell WLANs

  • Reduced Complexity Secure Cooperative Compressive Spectrum Sensing for Wideband Cognitive Radio Systems International conference

    Mohammed Farrag, Mostafa El-Khamy, Osamu Muta, Mohamed El-Sharkawy, Hiroshi Furukawa

    Proc. IEEE VTS Asia Pacific Wireless Communication Symposium (APWCS) 2012  2012.8 

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    Event date: 2012.8

    Presentation type:Oral presentation (general)  

    Venue:Essen   Country:Japan  

    Reduced Complexity Secure Cooperative Compressive Spectrum Sensing for Wideband Cognitive Radio Systems

  • Reduced Complexity Secure Cooperative Compressive Spectrum Sensing for Cognitive Radio Applications

    Mohammed Farrag, Mostafa El-Khamy, Osamu Muta, Mohamed El-Sharkawy, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2012.7 

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    Event date: 2012.7

    Presentation type:Oral presentation (general)  

    Venue:岩手大学   Country:Japan  

    Reduced Complexity Secure Cooperative Compressive Spectrum Sensing for Cognitive Radio Applications

  • MIMOベクトル符号化伝送における位相制御によるピーク電力抑圧の一検討

    牟田修

    電子情報通信学会 通信方式研究会  2012.7 

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    Event date: 2012.7

    Presentation type:Oral presentation (general)  

    Venue:沖永良部島 知名町中央公民館   Country:Japan  

    A Study on Phase Control based Peak Power Reduction for MIMO Vector Coding Systems

    Other Link: http://www.ieice.org/ken/paper/20120713R0Tp/eng/

  • 適応ピークキャンセラを用いたMIMO-OFDM信号のピーク電力低減に関する検討

    日野貴哉, 牟田修, 古川浩

    電子情報通信学会 通信方式研究会  2012.7 

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    Event date: 2012.7

    Presentation type:Oral presentation (general)  

    Venue:沖永良部島 知名町中央公民館   Country:Japan  

    Study on PAPR Reduction with Adaptive Peak Cancellation for MIMO-OFDM Signals

    Other Link: http://www.ieice.org/ken/paper/20120713t0s1/eng/

  • 量子化誤差影響下の定包絡線変調受信機における非線形等化の検討

    小寺康平, 牟田修, 古川浩

    電子情報通信学会 無線通信システム研究会  2012.4 

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    Event date: 2012.4

    Presentation type:Oral presentation (general)  

    Venue:京都大学 百周年時計台記念館 国際交流ホールI   Country:Japan  

    Available after conference date

  • 屋内無線バックホールにおけるマルチアンテナ無線中継伝送の特性評価

    黄 錫明, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2012.3 

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    Event date: 2012.3

    Presentation type:Oral presentation (general)  

    Venue:岡山大学 津島キャンパス   Country:Japan  

    Low Complexity Channel Estimation for MIMO-Constant Envelope Modulation

  • 量子化雑音影響下の定包絡線位相変調システムにおける非線形等化の計算量削減

    小寺康平, 福永龍太, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2012.3 

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    Event date: 2012.3

    Presentation type:Oral presentation (general)  

    Venue:岡山大学 津島キャンパス   Country:Japan  

  • An Efficient Equalization Scheme for Constant Envelope Modulation Receiver Affected by Quantization Error International conference

    Kohei Kotera, Osamu Muta, and Hiroshi Furukawa

    Japan-Egypt Conference on Electronics, Communications and Computers 2012  2012.3 

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    Event date: 2012.3

    Presentation type:Oral presentation (general)  

    Venue:Hilton Alexandria Green Plaza   Country:Egypt  

    An Efficient Equalization Scheme for Constant Envelope Modulation Receiver Affected by Quantization Error

    Other Link: http://jececc.ejust.edu.eg/

  • Performance Evaluation of Wireless Multi-hop Networks with Directional Antennas in an Indoor Radio Propagation Channe International conference

    Ximing Huang, Osamu Muta, and Hiroshi Furukawa

    Japan-Egypt Conference on Electronics, Communications and Computers 2012  2012.3 

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    Event date: 2012.3

    Presentation type:Oral presentation (general)  

    Venue:Hilton Alexandria Green Plaza   Country:Egypt  

    Performance Evaluation of Wireless Multi-hop Networks with Directional Antennas in an Indoor Radio Propagation Channe

    Other Link: http://jececc.ejust.edu.eg/

  • Efficient Nonlinear Equalization Scheme for MIMO Constant Envelope Modulation Receivers Affected by Quantization Error International conference

    Kohei Kotera, Osamu Muta, Hiroshi Furukawa

    International Conference on Information Networking (ICOIN) 2012  2012.2 

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    Event date: 2012.2

    Presentation type:Oral presentation (general)  

    Venue:The Patra Bali Resort & Villas - Bali   Country:Indonesia  

    Efficient Nonlinear Equalization Scheme for MIMO Constant Envelope Modulation Receivers Affected by Quantization Error

    Other Link: http://www.icoin.org/

  • Low Complexity Channel Estimation for MIMO-Constant Envelope Modulation

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2012.1 

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    Event date: 2012.1

    Presentation type:Oral presentation (general)  

    Country:Japan  

    Low Complexity Channel Estimation for MIMO-Constant Envelope Modulation

    Other Link: http://www.ieice.org/ken/program/index.php?instsoc=IEICE-B&tgid=IEICE-RCS&year=9&region=0&sch1=1&schkey=&pnum=0&psize=2&psort=0&layout=&lang=eng&pskey=&ps1=1&ps2=1&ps3=1&ps4=1&ps5=1&search_mode=

  • Phase-Sequence Blind Estimation for Phase-Rotation based PAPR Reduction in MIMO Coded-OFDM Systems International conference

    Osamu Muta

    International Conference on Signal Processing and Communication Systems 2011  2011.12 

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    Event date: 2011.12

    Venue:Outrigger Waikiki on the Beach (ホノルル)   Country:Armenia  

    Phase-Sequence Blind Estimation for Phase-Rotation based PAPR Reduction in MIMO Coded-OFDM Systems

    Other Link: http://www.dspcs-witsp.com/icspcs_2011/

  • Static and Dynamic Channel Estimation Techniques for MIMO-Constant Envelope Modulation International conference

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    Workshop on Mobile Computing and Emerging Communication Networks(Globecom workshop), 2011  2011.12 

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    Event date: 2011.12

    Venue:Houston Texas, U.S.A.   Country:Armenia  

    Static and Dynamic Channel Estimation Techniques for MIMO-Constant Envelope Modulation

    Other Link: http://mcecn.ntua.gr/

  • Effect of Phase Control Based PAPR Reduction in MIMO Adaptive Modulated Vector Coding Systems International conference

    Osamu Muta

    International Conference on Wireless Communications and Signal Processing  2011.10 

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    Event date: 2011.10

    Venue:Huangshan, Namjing   Country:China  

    Effect of Phase Control Based PAPR Reduction in MIMO Adaptive Modulated Vector Coding Systems

    Other Link: www.ic-wcsp.org

  • Signal Processing Techniques for Wireless Communication Systems International conference

    Osamu Muta

    Busan-Fukuoka System Semiconductor Workshop  2011.9 

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    Event date: 2011.9

    Presentation type:Symposium, workshop panel (public)  

    Venue:Busan   Country:Korea, Republic of  

    Signal Processing Techniques for Wireless Communication Systems

  • 量子化雑音影響下の定包絡線位相変調受信機における最尤系列推定

    福永龍太, 小寺康平, 牟田修, 古川浩,

    電気関係学会九州支部連合大会  2011.9 

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    Event date: 2011.9

    Venue:佐賀大学本条キャンパス   Country:Japan  

  • ADCの量子化雑音影響下における定包絡線位相変調信号の非線形等化手法に関する検討

    小寺康平, 福永龍太, 牟田 修, 古川 浩

    電子情報通信学会 ソサイエティ大会  2011.9 

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    Event date: 2011.9 - 2011.7

    Presentation type:Oral presentation (general)  

    Venue:北海道大学   Country:Japan  

    A Study on Nonlinear Equalization for Constant Envelope Phase Modulation Signals affected by Quantization Noise in ADC

  • Decision Directed Channel Tracking for MIMO-Constant Envelope Modulation International conference

    Ehab Mahmoud Mohamed, Osamu Muta, and Hiroshi Furukawa

    Digital Information and Communication Technology and Its Applications 2011  2011.7 

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    Event date: 2011.7

    Country:Other  

    Decision Directed Channel Tracking for MIMO-Constant Envelope Modulation

  • Channel Estimation Technique for MIMO-Constant Envelope Modulation International conference

    Ehab Mahmoud Mohamed, Osamu Muta, and Hiroshi Furukawa

    The International Wireless Communications and Mobile Computing Conference  2011.7 

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    Event date: 2011.7

    Country:Other  

    Channel Estimation Technique for MIMO-Constant Envelope Modulation

  • Decision-Directed Channel Tracking for MIMO Constant Envelope Modulation

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 無線通信システム研究会  2011.3 

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    Event date: 2011.3

    Presentation type:Oral presentation (general)  

    Venue:横須賀テレコムリサーチパーク YRPセンター1番館 (A) YRPホール,(B) 会議室   Country:Japan  

    Decision-Directed Channel Tracking for MIMO Constant Envelope Modulation

  • マルチアンテナ無線中継機における中継パケットを利用するアンテナ切替制御方式

    池崎一生, 牟田 修, 古川 浩

    電子情報通信学会 総合大会  2011.3 

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    Event date: 2011.3

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Radio Relay Transmission with a Cross-Polarized Multi-Antenna System for Wireless Backhaul International conference

    Issei Ikezaki, Osamu Muta, and Hiroshi Furukawa

    Proceedings of the International Conference on Communications and Signal Processing (ICCSP 2011)  2011.2 

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    Event date: 2011.2

    Country:Other  

    Radio Relay Transmission with a Cross-Polarized Multi-Antenna System for Wireless Backhaul

  • Adaptive Predistortion Linearization Based on Orthogonal Polynomial Expansion for Nonlinear Power Amplifiers in OFDM Systems International conference

    Osamu Muta, Isamu Kaneko, Yoshihiko Akaiwa, and Hiroshi Furukawa

    Proceedings of the International Conference on Communications and Signal Processing (ICCSP 2011)  2011.2 

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    Event date: 2011.2

    Country:Other  

    Adaptive Predistortion Linearization Based on Orthogonal Polynomial Expansion for Nonlinear Power Amplifiers in OFDM Systems

  • 無線バックホールにおける直交偏波を用いたマルチアンテナ無線中継伝送の検討

    池崎一生, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2011.1 

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    Event date: 2011.1

    Presentation type:Oral presentation (general)  

    Venue:屋久島離島開発総合センター   Country:Japan  

    Simplified Cross-Polarized Multi-Antenna System for Radio Relay Transmission in Wireless Backhaul

  • ベクトル符号化適応変調システムにおける上位ビットスクランブルによるPAPR抑圧方式

    安藤靖人, 牟田 修, 古川 浩

    電子情報通信学会 無線通信システム研究会  2010.11 

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    Event date: 2010.11

    Presentation type:Oral presentation (general)  

    Venue:フェニックス・プラザ   Country:Japan  

    PAPR Reduction Method Based on Significant-Bit Scrambling in Adaptive Modulated MIMO Vector Coding Systems

  • 低分解能ADCを用いる定包絡線位相変調システムの伝送特性

    高瀬 佑, 小寺康平, 牟田 修, 古川 浩

    電子情報通信学会 2010年度ソサイエティ大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Venue:大阪府立大学 中百舌鳥(堺市)   Country:Japan  

  • Adaptive Channel Estimation for Constant Envelope Modulation Transceiver Systems with a Low Resolution ADC

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 2010年度ソサイエティ大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Venue:大阪府立大学 中百舌鳥キャンパス(堺市)   Country:Japan  

    Adaptive Channel Estimation for Constant Envelope Modulation Transceiver Systems with a Low Resolution ADC

  • ベクトル符号化適応変調システムにおける自己同期型上位ビットスクランブルによるPAPR抑圧方式

    安藤靖人, 牟田 修, 古川 浩

    電子情報通信学会 2010年度ソサイエティ大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Venue:大阪府立大学 中百舌鳥キャンパス(堺市)   Country:Japan  

  • 低分解能ADCを用いる定包絡線変調システムの伝送特性評価

    高瀬 佑, 牟田 修, 古川 浩

    平成22年度(第 63回)電気関係学会九州支部連合大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • 無線バックホールにおける直交偏波を用いたマルチアンテナ無線中継伝送の検討

    池崎一生, 牟田 修, 古川 浩

    平成22年度(第 63回)電気関係学会九州支部連合大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • MIMOベクトル符号化適応変調システムにおける上位ビットスクランブルによるPAPR抑圧方式

    安藤靖人, 牟田 修, 古川 浩

    平成22年度(第 63回)電気関係学会九州支部連合大会  2010.9 

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    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Channel Estimation Techniques for Constant Envelope Modulation Transceiver Systems with a Low Resolution ADC

    Ehab Mahmoud Mohamed, Osamu Muta, Hiroshi Furukawa

    電子情報通信学会 通信方式研究会  2010.8 

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    Event date: 2010.8

    Presentation type:Oral presentation (general)  

    Country:Japan  

    Channel Estimation Techniques for Constant Envelope Modulation Transceiver Systems with a Low Resolution ADC

  • 低分解能ADCを用いるMIMO無線中継システムにおけるGMSKの伝送特性評価

    小寺康平, 牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2010.7 

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    Event date: 2010.7

    Presentation type:Oral presentation (general)  

    Country:Japan  

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  • 低分解能ADCを用いるMIMO無線中継システムにおけるGMSKの伝送特性評価

    小寺康平, 牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2010.7 

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    Event date: 2010.7

    Presentation type:Oral presentation (general)  

    Country:Japan  

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  • 定包絡線変調と低分解能ADCを用いるMIMO無線伝送の検討

    牟田 修, 古川 浩

    電子情報通信学会 通信方式研究会  2010.6 

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    Event date: 2010.6

    Presentation type:Oral presentation (general)  

    Venue:京都大学   Country:Japan  

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  • パイロットレス伝搬路追従技術を用いたOFDMAシステムにおける適応リソース割当方式 ~ 適応変調を適用した場合の特性評価 ~

    坂元一光, 牟田 修, 赤岩芳彦, Krishnamurthy Giridhar, 古川 浩

    電子情報通信学会 通信方式研究会  2010.3 

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    Event date: 2010.3

    Presentation type:Oral presentation (general)  

    Country:Japan  

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  • 帯域制限OQAMマルチキャリア伝送へのPer-subcarrier時間領域等化の適用効果

    國島大充, 牟田 修, 古賀久雄, 赤岩芳彦

    電子情報通信学会無線通信システム研究会  2009.12 

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    Event date: 2009.12

    Presentation type:Oral presentation (general)  

    Country:Japan  

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  • モバイルWiMAX準拠のOFDMシステムにおけるリミタに基づくPAPR抑圧特性の評価

    高瀬 佑, 牟田 修, 赤岩芳彦

    電子情報通信学会無線通信システム研究会  2009.8 

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    Event date: 2009.8

    Presentation type:Oral presentation (general)  

    Venue:--   Country:Japan  

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  • サブキャリア位相制御によるPAPR抑圧技術を適用したLDPC符号化OFDMシステムにおける位相重み系列推定に関する検討

    牟田 修

    電子情報通信学会無線通信システム研究会  2009.8 

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    Event date: 2009.8

    Presentation type:Oral presentation (general)  

    Venue:--   Country:Japan  

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  • An Adaptive Resource Allocation Method for OFDMA Systems Employing Decision-Directed Channel Tracking (判定帰還形伝搬路追従技術を用いたOFDMAシステムのための適応リソース割当方式)

    Osamu Muta, Kazumitsu Sakamoto, Yoshihiko Akaiwa, Krishnamurthy Giridhar

    電子情報通信学会総合大会  2009.3 

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    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:愛媛大学   Country:Japan  

    An Adaptive Resource Allocation Method for OFDMA Systems Employing Decision-Directed Channel Tracking

  • Amplify-and-Forward無線中継における共通参照信号系列を利用した基地局アダプティブアレイアンテナの受信重み係数最適化法

    藤井大樹, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2009.3 

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    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:神奈川県横須賀市 横須賀リサーチパーク   Country:Japan  

    Common Pilot Sequence Assisted Receive Weight Optimization Methods for a Base Station Adaptive Array Antenna in Amplify-and-forward Radio Relay Systems

  • An Adaptive Resource Allocation Method for OFDMA Systems Employing Pilotless Channel Tracking Techniques

    Kazumitsu Sakamoto, Osamu Muta, Yoshihiko Akaiwa, Krishnamurthy Giridhar

    電子情報通信学会 無線通信システム研究会  2009.3 

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    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:神奈川県 横須賀市 横須賀リサーチパーク   Country:Japan  

    An Adaptive Resource Allocation Method for OFDMA Systems Employing Pilotless Channel Tracking Techniques

  • 2.4GHz帯 屋外実伝搬環境下における マルチキャリア無線中継の伝送特性評価

    佐々木元晴, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2009.3 

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    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:神奈川県 横須賀市 横須賀リサーチパーク   Country:Japan  

    Performance Evaluation of Multicarrier Transmission for Radio Relaying in Measured Outdoor Channels at 2.4GHz-Band.

  • 直交多項式に基づく適応プレディストータにおけるマルチキャリア信号に対する歪み補償パラメータの最適化速度の改善

    金子 勇, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2009.3 

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    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:神奈川県 横須賀市 横須賀リサーチパーク   Country:India  

    Parameter Optimization Speed Improvement for Multi-carrier Signals in An Adaptive Predistortion Method Based on Orthogonal Polynomial Expansion

  • Adaptive Channel Estimation for MIMO-Constant Envelope Modulation International conference

    Ehab Mahmoud Mohamed, Osamu Muta, and Hiroshi Furukawa

    IEICE Trans. Commun., Vol.E95-B, No.07, pp.2393-2404  2012.7 

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    Country:Japan  

    Adaptive Channel Estimation for MIMO-Constant Envelope Modulation

  • 直交多項式展開に基づく適応プレディストータ型非線形歪み補償方式 (2)

    徐 広勝, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2008.3 

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    Presentation type:Oral presentation (general)  

    Venue:神奈川県 横須賀市   Country:Japan  

    An adaptive predistortion method based on orthogonal polynomial expansion for nonlinear distortion compensation、Part Ⅱ

  • アンテナ素子当たりの最大電力が制限されたSDMAシステムにおける最適重み係数の決定法とその特性評価

    藤井大樹, 牟田 修, 赤岩芳彦

    電子情報通信学会 総合大会  2008.3 

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    Presentation type:Oral presentation (general)  

    Venue:北九州学術研究都市 三大学   Country:Japan  

    A weight optimization method and its performance evaluation in SDMA systems under constraint of the maximum power for an Antenna element

  • モバイルWiMAX準拠のシステムにおける同一チャネル干渉軽減法の検討

    清水良一, 坂元一光, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2008.3 

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    Presentation type:Oral presentation (general)  

    Venue:神奈川県 横須賀市   Country:Japan  

    A study on co-channel interference supression method for a mobile-WiMAX based system

  • Effects of PAPR Reduction Based on Peak Limiter in IEEE802.16e Based OFDM System International conference

    Yu Takase, Osamu Muta, Yoshihiko Akaiwa

    IEICE Transactions on Communications, Vol.E94-B, No.05, pp.1467-1471  2011.5 

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    Country:Japan  

    Effects of PAPR Reduction Based on Peak Limiter in IEEE802.16e Based OFDM System

  • OFDMAシステムにおける再利用分割に基づく動的チャネル割当を用いた同一チャネル干渉軽減法の検討

    坂元一光、清水良一、牟田 修、赤岩芳彦

    電子情報通信学会 総合大会  2008.3 

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    Presentation type:Oral presentation (general)  

    Venue:北九州学術研究都市 三大学   Country:Japan  

    A Study on Co-Channel Interference Suppression by Dynamic Channel Assignment Based on Reuse Partitioning for OFDMA Systems

  • 周波数選択性フェージング下での適応チャネル選択方式

    牟田修, 松原仙, R.Canchi, 赤岩芳彦

    電子情報通信学会 総合大会  1997.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • 周波数選択性フェージング下でのFDMA/TDDシステムでの適応チャネル選択方式の特性

    牟田修, 赤岩芳彦

    電子情報通信学会 通信ソサイエティ大会  1997.9 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア伝送方式における適応送信電力制御下でのピーク電力抑圧方式

    牟田修, 高田竜彦, 赤岩芳彦

    電子情報通信学会 通信ソサイエティ大会  1998.10 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • 周波数選択性フェージング下での適応チャネル選択方式

    牟田修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  1998.1 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    Adaptive Channel Selection under Frequency-selective Fading Environment

  • マルチキャリア伝送におけるパリティキャリアを用いたピーク電力抑圧方式

    高田竜彦, 牟田修, 赤岩芳彦

    電子情報通信学会 通信ソサイエティ大会  1998.10 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア伝送方式における適応送信電力制御下でのピーク電力抑圧方式

    牟田修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  1998.11 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    Peak Power Suppression with Adaptive Transmit Power Control for Multi-Carrier Transmission

  • マルチキャリア伝送におけるパリティキャリアを用いたピーク電力抑圧方式(2)

    高田竜彦, 牟田修, 赤岩芳彦

    電子情報通信学会 総合大会  1999.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリヤ伝送におけるパリティキャリヤ を用いたピーク電力抑圧方式

    高田竜彦,牟田修,赤岩芳彦

    電子情報通信学会 無線通信システム研究会  1999.11 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    Peak Power Suppression with Parity Carrier for Multi-carrier Transmission

  • パイロット信号を内挿したマルチキャリア変調方式における伝搬路応答推定法

    牟田修, 赤岩芳彦

    電子情報通信学会 総合大会  2000.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • ナイキスト帯域制限信号におけるガード区間挿入

    江頭慶真、牟田修、赤岩芳彦

    電子情報通信学会 総合大会  2001.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • パイロット信号を内挿したマルチキャリア変調方式における伝搬路特性推定方式(Ⅱ)

    牟田修, 赤岩芳彦

    電子情報通信学会 総合大会  2001.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア変調方式における合成パイロット信号のフーリエ変換による周波数伝達特性推定

    江頭慶真、牟田修、赤岩芳彦

    平成13年度電気関係学会九州支部大会  2001.9 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア変調方式における合成パイロット信号を用いた周波数伝達特性推定方式

    江頭慶真, 牟田修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2002.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    A Channel Estimation Scheme with Co-phased Pilot-Signals for Multi-Carrier Modulation

  • An Improved Channel Estimation Scheme for Frequency Domain Equalization in Multicarrier Moduration

    Y.Egashira, O.Muta, Y.Akaiwa

    電子情報通信学会 通信ソサイエティ大会  2002.9 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア伝送において判定帰還型等化を用いた場合の特性評価

    森若良太、牟田修、赤岩芳彦

    電子情報通信学会 通信ソサイエティ大会  2002.9 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルチキャリア伝送において複数の信頼度情報を用いる消失復号誤り訂正方式

    森若良太, 牟田修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2003.3 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    An Erasure Decoding Error Correction Method with Two Reliability Informations for Multi-Carrier Modulation

  • BCH符号化OFDM信号のための検査ビット反転に基づくピーク電力低減方式

    牟田修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2003.11 

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    Presentation type:Oral presentation (general)  

    Country:Japan  

    A Peak Power Reduction Scheme based on Reversal of Parity-bits for BCH-coded OFDM Signal

  • ブロック符号化OFDM信号のための検査ビット反転に基づくピーク電力抑圧時の消失復号誤り訂正方式

    牟田 修, 赤岩 芳彦

    電子情報通信学会 ソサイエティ大会  2004.9 

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    Presentation type:Oral presentation (general)  

    Venue:徳島市 徳島大学   Country:Japan  

    An Erasure Decoding Error Correction Method for a Block-coded OFDM Signal with Peak Power Reduction based on Adaptive Reversal of Parity-bits

  • ターボ符号化OFDM信号における検査キャリア適応反転に基づくピーク電力抑圧方式

    牟田 修, 赤岩芳彦

    電子情報通信学会総合大会  2005.3 

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    Presentation type:Oral presentation (general)  

    Venue:豊中市 大阪大学  

    A peak power reduction scheme based on adaptive reversal of parity-carriers for a turbo coded OFDM signal

  • OFCDM信号の電力増幅におけるピーク低減と適応プレディストータの効果

    合澤直樹, 牟田 修, 赤岩芳彦

    電子情報通信学会無線通信システム研究会  2005.3 

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    Presentation type:Oral presentation (general)  

    Venue:横須賀市 横須賀リサーチパーク   Country:Japan  

    Effect of Peak Power Suppression and Adaptive Predistortion on Power Amplification of OFCDM Signal

  • 適応ガード区間長制御による1セル繰り返しTDMAセルラシステム

    堀川征一郎, 牟田 修, 赤岩芳彦

    電子情報通信学会無線通信システム研究会  2005.3 

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    Presentation type:Oral presentation (general)  

    Venue:横須賀市 横須賀リサーチパーク  

    A one-cell reuse TDMA cellular system with adaptive guard interval control

  • ターボ符号化OFDM信号における検査キャリア適応反転に基づくピーク電力低減方式

    牟田 修、赤岩 芳彦

    電子情報通信学会 無線通信システム研究会  2005.6 

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    Presentation type:Oral presentation (general)  

    Venue:愛知県 名古屋市 名古屋大学  

    A Peak Power Reduction Scheme based on Adaptive Reversal of Clustered Parity-Carriers for a Turbo-coded OFDM signal.

  • 部分系列伝送によるPAPR抑圧を適用したOFDM信号のための周波数ダイバーシチ伝送を利用した位相重み係数推定法

    牟田 修、 赤岩 芳彦

    電子情報通信学会ソサイエティ大会  2005.9 

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    Presentation type:Oral presentation (general)  

    Venue:北海道 札幌市 北海道大学  

    A Weighting-Factor Estimation Method with Frequency-Diversity Transmission for OFDM Signal with PAPR Suppression based on Partial-Transmit-Sequence.

  • OFCDM信号に対する信号間干渉を低減するピーク電力低減方式

    合澤直喜,牟田修,赤岩芳彦,佐和橋衛

    電子情報通信学会 無線通信システム研究会  2006.1 

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    Presentation type:Oral presentation (general)  

    Venue:福岡県 福岡市 九州大学   Country:Japan  

    N. Aizawa, O. Muta, Y. Akaiwa, M. Sawahashi, “A Peak Power Reduction Method with a reduced Inter-signal Interference for OFCDM Signal” IEICE Technical Report, RCS2005-124, pp. 1-6, 2006-1

  • 負帰還と適応プレディストータを併用した非線形歪み補償方式

    張 以涛, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2006.1 

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    Presentation type:Oral presentation (general)  

    Venue:福岡県 福岡市 九州大学   Country:Japan  

    Yitao ZHANG, Osamu MUTA, Yoshihiko AKAIWA, "A Nonlinear Distortion Compensation Method with an Adaptive Predistorter and Negative Feed-back"
    IEICE Technical Report, RCS2005-168, pp. 77-82, 2006-1

  • LDPC符号化OFDM伝送における検査行列の構造を利用した位相制御型ピーク電力抑圧方式

    牟田 修,赤岩 芳彦

    電子情報通信学会 無線通信システム研究会  2007.1 

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    Presentation type:Oral presentation (general)  

    Venue:沖縄   Country:Japan  

    Peak Power Reduction Method Based on Structure of Parity-check Matrix for LDPC coded OFDM transmission

  • 固有ビームMIMOシステムにおける送受信ウェイトのLMSアルゴリズムに基づく決定法

    冨永孝由樹,牟田 修,赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2007.1 

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    Presentation type:Oral presentation (general)  

    Venue:沖縄   Country:Japan  

    A Least Mean Square Based Algorithm to Determine Transmit and Receive Weights for Eigenbeam MIMO Systems

  • 帯域制限OQAMマルチキャリア伝送を用いた高速電灯線通信方式

    川畑直弘,古賀久雄,牟田 修,赤岩芳彦

    電子情報通信学会 通信方式研究会  2007.1 

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    Presentation type:Oral presentation (general)  

    Venue:与那国   Country:Japan  

    A High-Speed Power-Line Communication System with band-limited OQAM based Multi-Carrier Transmission

  • LDPC符号化SDM-OFDM伝送における検査行列の構成に基づく位相制御型ピーク電力抑圧方式

    牟田 修、赤岩芳彦

    電子情報通信学会 総合大会  2007.3 

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    Presentation type:Oral presentation (general)  

    Venue:愛知県名古屋市名城大学  

    Peak Power Reduction Method Based on Structure of Parity-check Matrix for LDPC coded SDM-OFDM Transmission

  • A Weight Optimization Method under Constraint of the Maximum Power for an Antenna Element in SDM System International conference

    Daiki Fujii, Osamu Muta, Yoshihiko Akaiwa

    2007 Japan-Indo Workshop on Microwave, Photonics, and Communication Systems  2007.7 

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    Presentation type:Oral presentation (general)  

    Venue:Fukuoka, Kyushu University   Country:Japan  

    A Weight Optimization Method under Constraint of the Maximum Power for an Antenna Element in SDM System

  • An Adaptive Predistortion method Based on orthogonal polynomial expansion for nonlinear distortion compensation

    徐 広勝, 牟田 修, 赤岩 芳彦

    電子情報通信学会 無線通信システム研究会  2007.7 

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    Presentation type:Oral presentation (general)  

    Venue:北見工業大学   Country:Japan  

    An Adaptive Predistortion method Based on orthogonal polynomial expansion for nonlinear distortion compensation

  • 空間分割多重方式におけるアンテナ素子当りの最大送信電力制限下での最適重み決定法

    藤井大樹, 牟田 修, 赤岩芳彦

    電子情報通信学会 無線通信システム研究会  2007.7 

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    Presentation type:Oral presentation (general)  

    Venue:北見工業大学   Country:Japan  

    A Weight Optimization Method under Constraint of the Maximum Power for an Antenna Element in SDM Systems

  • MIMO無線通信システムにおけるターボ符号化マルチキャリア信号の適応サブブロック位相制御によるPAPR抑圧の効果

    牟田 修, 赤岩芳彦

    電子情報通信学会 通信方式研究会  2008.1 

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    Presentation type:Oral presentation (general)  

    Venue:鹿児島県 名瀬市   Country:Japan  

    On the Effect of PAPR Reduction Based on Adaptive Subblock Flipping for Coded Multi-Carrier Signal in MIMO Wireless Communication Systems

  • 高速電灯線通信における帯域制限OQAMマルチキャリア伝送に適した適応等化および周期性雑音除去方式

    國島大充, 古賀久雄, 牟田 修, 赤岩芳彦

    電子情報通信学会 通信方式研究会  2008.1 

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    Presentation type:Oral presentation (general)  

    Venue:鹿児島県 奄美大島   Country:Japan  

    oint use of adaptive equalization and cyclic noise cancellation for band-limited OQAM based multi-carrier transmission in high-speed power-line communication systems

  • 帯域制限OQAMマルチキャリア電灯線通信における適応等化および周期性雑音キャンセラの適応選択方式

    國島大充、古賀久雄、牟田 修、赤岩芳彦

    電子情報通信学会 総合大会  2008.3 

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    Presentation type:Oral presentation (general)  

    Venue:北九州学術研究都市 三大学   Country:Japan  

    Adaptive Selection Method of Adaptive Equalization and Cyclic Noise Cancellation for Band-limited OQAM based Multi-carrier Power-line Communication Systems

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MISC

  • 技術情報誌TELECOM FRONTIER

    Osamu Muta

    TELECOM FRONTIER   124   1 - 10   2024.8

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    Authorship:Lead author   Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.  

  • 機械学習・数理最適化の無線通信への応用に向けた共有データセット構想 Reviewed

    丸田一輝, 井田悠太, 實松豊, 牟田修, 岡田啓, 西村寿彦, 岡本英二, 眞田幸俊, 村田英一, 田野哲

    電子情報通信学会誌   2022.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

Industrial property rights

Patent   Number of applications: 14   Number of registrations: 8
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • Institute of Electrical and Electronics Engineers (IEEE)

  • Institute of Electronics, Information and Communication Engineers (IEICE)

Committee Memberships

  • IEICE Communications Society   IEICE JB Special Section Associate Editor   Domestic

    2025.2 - 2026.1   

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  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌(EB) 小特集 編集委員「Special Section on Technologies and Proof-of-Concept Activities for 5G Advanced and 6G」   Foreign country

    2022.9 - 2023.9   

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    Committee type:Academic society

  • 電子情報通信学会 無線通信システム研究会   副委員長   Domestic

    2022.6 - 2025.5   

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌(EB) 小特集 編集幹事「Special Issue on Multidisciplinary and Innovative Key technologies in Advanced communication systems (MIKA)」   Foreign country

    2021.10 - 2022.10   

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    Committee type:Academic society

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌(EB) 小特集 編集幹事「Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond」   Foreign country

    2020.9 - 2021.9   

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    Committee type:Academic society

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌(EB) 小特集 編集委員「Special Section on Future Directions of Research and Development on Communication Quality」   Foreign country

    2020.7 - 2021.7   

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    Committee type:Academic society

  • 電子情報通信学会 無線通信システム研究会   Organizer   Domestic

    2019.6 - 2021.5   

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌(EB) 小特集 編集副委員長「Special Section on European ICT R&D Project Activities on Broadband Access Technologies in Conjunction with Main Topics of 2016/2017 IEICE ICT Forum」   Foreign country

    2018.5 - 2019.5   

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    Committee type:Academic society

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌 小特集 編集委員 「Special Section on Communication Quality in Wireless Networks」   Foreign country

    2017.7 - 2018.7   

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    Committee type:Academic society

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 英文論文誌 小特集 編集委員 「Special Section on Radio Access Technologies for 5G Mobile Communications System」  

    2016.8 - 2017.8   

  • 電子情報通信学会 通信方式研究会   Organizer   Domestic

    2016.5 - 2018.5   

  • IEEE ComSoc Asia Pacific Board   IEEE ComSoc Asia Pacific Board (APB), Membership Development Committee (MDC) Vice Chair   Foreign country

    2016.4 - 2017.3   

  • 電子情報通信学会 コミュニケーションクオリティ研究会   専門委員   Domestic

    2015.11 - Present   

  • 電子情報通信学会 通信ソサイエティ「European ICT R&D Project Activities on Broadband Access Technologies in Conjunction with Main Topics of 2015 IEICE ICT Forum」   電子情報通信学会 英文論文誌 小特集 編集幹事   Foreign country

    2015.5 - 2016.5   

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    Committee type:Academic society

  • 電子情報通信学会 通信方式研究会   研究専門委員   Domestic

    2013.5 - 2016.5   

  • 電子情報通信学会 無線通信システム研究会   専門委員   Domestic

    2010.6 - 2015.5   

  • Microwave and Optical Technology (IJMOT)   Microwave and Optical Technology (IJMOT) 査読委員   Foreign country

    2010.4 - Present   

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    Committee type:Academic society

  • 電子情報通信学会 通信ソサイエティ   電子情報通信学会 EB論文誌 編集委員   Foreign country

    2008.5 - 2012.5   

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    Committee type:Academic society

  • 電子情報通信学会   電子情報通信学会常任査読委員   Foreign country

    2004.11 - Present   

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    Committee type:Academic society

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Academic Activities

  • GLOBECOM2025, TPC member International contribution

    Role(s): Peer review

    IEEE ComSoc  2025.12

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    Type:Peer review 

  • IEEE VTC2025-Fall TPC member (IEEE Vehicular Technology Conference) International contribution

    Role(s): Peer review

    2025.10

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    Type:Peer review 

  • IEEE VTS APWCS2025, TPC member International contribution

    Role(s): Peer review

    2025.8

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    Type:Peer review 

  • ICUFN 2025, TPC member (2025 Sixteenth International Conference on Ubiquitous and Future Networks (ICUFN)) International contribution

    Role(s): Peer review

    2025.7

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    Type:Peer review 

  • VTC2025-Spring Track Co-chair International contribution

    Role(s): Peer review

    IEICE VTS  2025.6

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    Type:Peer review 

  • TPC member of IEEE ICC2025 (International Conference on Communications) International contribution

    Role(s): Review, evaluation

    2025.6

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    Type:Peer review 

  • TPC member, The 3rd Smart Sustainable Development 2025 conference International contribution

    Role(s): Peer review

    The 3rd Smart Sustainable Development 2025 conference  2025.3

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    Type:Peer review 

  • ICAIIC 2025, Technical program committee member International contribution

    Role(s): Review, evaluation

    2025.2

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    Type:Peer review 

  • ICNC 2025 TPC member (International Conference on Computing, Networking and Communications) International contribution

    Role(s): Peer review

    International Conference on Computing, Networking and Communications  2025.2

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    Type:Peer review 

  • ICOIN2025 TPC member International contribution

    Role(s): Peer review

    ICOIN2025 TPC  2025.1

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    Type:Peer review 

  • IEEE ICCE2025, TPC member (International Conference on Consumer Electronics) International contribution

    Role(s): Peer review

    2025.1

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    Type:Peer review 

  • ICSPCS2024 Technical program committee member International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2024  ( Gold Coast Australia ) 2024.12

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    Type:Competition, symposium, etc. 

  • GLOBECOM2024 Technical program committee member International contribution

    2024 IEEE Global Communications Conference (GLOBECOM2024)  ( Cape Town SouthAfrica ) 2024.12

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    Type:Competition, symposium, etc. 

  • ICETC 2024 Technical program committee member International contribution

    The 16th International Conference on Education Technology and Computers (ICETC 2024)  ( Kitakyushu Japan ) 2024.11

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  • Asia-APacific Microwave Conference (APMC) 2024, TPC Member International contribution

    Role(s): Peer review

    Asia-APacific Microwave Conference (APMC) 2024  2024.11

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    Type:Peer review 

  • ISAP2025 TPC member International contribution

    Role(s): Peer review

    The 2025 International Symposium on Antennas and Propagation (ISAP2025)  2024.10

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    Type:Peer review 

  • Technical program committee member International contribution

    The 29th Asia-Pacific Conference on Communications (APCC) 2024  ( Sydney Australia ) 2024.10

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  • Technical program committee member International contribution

    The 20th IEEE Asia Pacific Wireless Communications Symposium, APWCS 2024  ( One north Singapore ) 2024.8

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  • VTC2025-Spring Track Co-chair

    IEICE VTS  2024.6

  • Technical program committee member International contribution

    IEEE International Conference on Communications (ICC) 2024, Technical program committee member, June 9-13, 2024.  ( Denver UnitedStatesofAmerica ) 2024.6

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  • Technical program committee member International contribution

    International Conference on Artificial Intelligence in Information and Communication (ICAIIC) 2024  ( Osaka Japan ) 2024.2

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  • Technical program committee member International contribution

    2024 International Conference on Computing, Networking and Communications (ICNC)  ( Hawaii UnitedStatesofAmerica ) 2024.2

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 38th International Conference on Information Networking 2024 (ICOIN2024)  ( Ho Chi Minh City Vietnam ) 2024.1

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  • Screening of academic papers

    Role(s): Peer review

    2024

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:4

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical program committee chair International contribution

    International Conference on 6G Communications Networking and Signal Processing  ( Nanyang Technological University Singapore ) 2023.12

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  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2023  ( Alexandria Egypt ) 2023.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 28th Asia-Pacific Conference on Communications (APCC)  ( Sydney Australia ) 2023.11

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    Type:Competition, symposium, etc. 

  • Technical program committee Track Chair International contribution

    IEEE Vehicular Technology Conference Fall 2023  ( Hong Kong China ) 2023.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE/CIC International conference on Communications in China (ICCC) 2023  ( China ) 2023.8

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2023.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Conference Spring 2023  ( Florence Italy ) 2023.6

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2023.6

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Signal Processing and Communication Systems 2023  ( San Francisco UnitedStatesofAmerica ) 2023.6

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Conference on Communications (ICC)  ( Rome Italy ) 2023.5 - 2023.6

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2023.4

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    Type:Competition, symposium, etc. 

  • セッション座長

    電子情報通信学会 総合大会  ( Japan ) 2023.3

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2023.3

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Artificial Intelligence in Information and Communication (ICAIIC 2023)  ( Bali Indonesia ) 2023.2

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2023.1

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Information Networking 2023 (ICOIN2023)  ( Bangkok Thailand ) 2023.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:20

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:23

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2022  ( Alexandria Egypt ) 2022.12

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.12

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.11

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    27th Asia-Pacific Conference on Communications (APCC) 2022  ( Korea ) 2022.10

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 革新的無線通信技術に関する横断型研究会(MIKA)2022  ( Japan ) 2022.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Conference Fall 2022  ( Beijin China ) 2022.9

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    Type:Competition, symposium, etc. 

  • Session chair International contribution

    The 2022 Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC 2022)  ( Japan ) 2022.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2022  ( Online ) 2022.9

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    Type:Competition, symposium, etc. 

  • セッション座長

    電子情報通信学会 ソサイエティ大会  ( Japan ) 2022.9

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE 9th International Conference on Communications and Electronics 2022.  ( Nha Trang City Vietnam ) 2022.7

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    2022 Thirteenth International Conference on Ubiquitous and Future Networks (ICUFN)  ( Barcelona Spain ) 2022.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    Vehicular Technology Conference Spring 2022  ( Helsinki Finland ) 2022.6

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.6

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2022.5

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Conference on Communications (ICC) 2022  ( Soul Korea ) 2022.5 - 2023.5

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    Type:Competition, symposium, etc. 

  • セッション座長

    電子情報通信学会 総合大会  ( Japan ) 2022.3

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Artificial Intelligence in Information and Communication (ICAIIC 2022)  ( Guam UnitedStatesofAmerica ) 2022.2

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 35th International Conference on Information Networking 2022 (ICOIN2022)  ( Bangkok Thailand ) 2022.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:14

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:45

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2021  ( Alexandria Egypt ) 2021.12

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    Type:Competition, symposium, etc. 

  • Track chair International contribution

    International Conference on Emerging Technologies for Communications (ICETC) 2021  ( Tokyo University of Science, and online Japan ) 2021.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2021  ( Los Angeles UnitedStatesofAmerica ) 2021.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 12th International Conference on Information and Communications Technology Convergence (ICTC 2021)  ( Jeju Island Korea ) 2021.10

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    Type:Competition, symposium, etc. 

  • 座長

    情報伝送と信号処理ワークショップ  ( Japan ) 2021.10

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集: Special Issue on Multidisciplinary and Innovative Key technologies in Advanced communication systems (MIKA) International contribution

    2021.10 - 2022.10

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    Type:Academic society, research group, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Conference Fall 2021  ( Online ) 2021.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2021  ( Helsinki Finland ) 2021.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE VTS APWCS 2021 (Asia Pacific Wireless Communications Symposium)  ( Japan ) 2021.8 - 2021.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Ubiquitous and Future Networks (ICUFN) 2021  ( Korea & online Korea ) 2021.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Conference on Communications (ICC) 2021  ( Quebec Canada ) 2021.6

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2021.4

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Artificial Intelligence in Information and Communication (ICAIIC 2021)  ( Jeju Island Korea ) 2021.4

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 総合大会  ( Japan ) 2021.3

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2021.3

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    35th International Conference on Information Networking (ICOIN) 2021  ( Bangkok Thailand ) 2021.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:16

    Number of peer-reviewed articles in Japanese journals:3

    Proceedings of International Conference Number of peer-reviewed papers:26

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical program committee member International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2020  ( Adelaide Australia ) 2020.12

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    Type:Competition, symposium, etc. 

  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2020  ( Online Egypt ) 2020.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 11th International Conference on Information and Communications Technology Convergence (ICTC 2020)  ( Jeju Island Korea ) 2020.10

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集:Special Section on Technology Trials and Proof-of-Concept Activities for 5G Evolution and Beyond International contribution

    2020.9 - 2021.9

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    Type:Academic society, research group, etc. 

  • Technical program committee member International contribution

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) 2020  ( London UnitedKingdom ) 2020.8 - 2020.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2020  ( London UnitedKingdom ) 2020.8 - 2020.9

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2020.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE ICCC 2020 (2020 IEEE/CIC International Conference on Communications in China (ICCC)  ( Chongqing China ) 2020.8

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集:Special Section on Future Directions of Research and Development on Communication Quality International contribution

    2020.7 - 2021.7

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    Type:Academic society, research group, etc. 

  • Technical program committee member International contribution

    International Conference on Ubiquitous and Future Networks (ICUFN 2020)  ( Porto Portugal ) 2020.6 - 2020.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    2020 International Conference on Platform Technology and Service  ( Busan Korea ) 2020.6 - 2020.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International conference on communications 2020  ( Dublin Ireland ) 2020.6

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    Type:Competition, symposium, etc. 

  • Technical program committee co-chair International contribution

    IEEE Vehicular Technology Conference Spring 2020  ( Antwerp Belgium ) 2020.5

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:24

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:18

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2019.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    13th International Conference on Signal Processing and Communication Systems (ICSPCS) 2019  ( Surfers Paradise Australia ) 2019.12

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    Type:Competition, symposium, etc. 

  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2019  ( Alexandria Egypt ) 2019.12

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2019.11

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 2019 25th Asia-Pacific Conference on Communications (APCC'19)  ( Ho Chi Minh City Vietnam ) 2019.11

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2019.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 10th International Conference on Information and Communications Technology Convergence (ICTC 2019)  ( Jeju Island Korea ) 2019.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 2019 International Symposium on Electrical and Electronics Engineering (ISEE 2019)  ( Ho Chi Minh City Vietnam ) 2019.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Conference Fall 2019  ( Hawaii UnitedStatesofAmerica ) 2019.9

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 ソサイエティ大会  ( Japan ) 2019.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)  ( Istanbul Turkey ) 2019.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium (IEEE VTS APWCS) 2019  ( Singapore University of Technology and Design (SUTD) Singapore ) 2019.8

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 コミュニケーションクオリティ研究会  ( Japan ) 2019.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    2019 IEEE/CIC International Conference on Communications in China (IEEE CIC ICCC 2019)  ( Changchun China ) 2019.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 8th IEEE International Conference on Communication, Networks and Satellite (IEEE COMNETSAT 2019)  ( Makassar Indonesia ) 2019.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    11th International Conference on Ubiquitous and Future Networks (ICUFN) 2019  ( Zagreb Croatia ) 2019.7

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE International Conference on Communications 2019  ( Shanghai China ) 2019.5

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Conference Spring 2019  ( Kuala Lumpur Malaysia ) 2019.4 - 2019.5

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE VTC2019 Spring workshop, TPoC5G  ( Kuala Lumpur Malaysia ) 2019.4

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    The 3rd International Conference on Recent Advances in Signal Processing, Telecommunications & Computing (SigTelCom2019)  ( Ha Noi City Vietnam ) 2019.3

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 総合大会  ( Japan ) 2019.3

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    The 33rd International Conference on Information Networking (ICOIN) 2019  ( Kuala Lumpur Malaysia ) 2019.1

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 34th International Conference on Information Networking (ICOIN) 2020  ( その他 ) 2019.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:9

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:19

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • The Technical Program Committee Member

    ICSPCS 2018 (2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS))  ( Cairns Australia ) 2018.12

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    Type:Competition, symposium, etc. 

  • Organization committee co-chair International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC) 2018  ( Alexandria Egypt ) 2018.12

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    Asia-Pacific Microwave Conference  ( Kyoto Japan ) 2018.11

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    International Conference on Information and Communications Technology Convergence (ICTC 2018)  ( Jeju Island Korea ) 2018.10

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    IEEE 29th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) 2018  ( Bologna Italy ) 2018.9

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    APWCS 2018 (Asia Pacific Wireless Communications Symposium)  ( Hsinchu Taiwan ) 2018.8

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    Tenth International Conference on Ubiquitous and Future Networks 2018 (ICUFN 2018)  ( Prague CzechRepublic ) 2018.7

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    Type:Competition, symposium, etc. 

  • The Technical Program Committee Member International contribution

    VTC2018-Spring Recent Results and Workshops (Technology Trials and Proof-of-Concept Activities for 5G and Beyond 2018 : TPoC5G 2018)  ( Porto Portugal ) 2018.6

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    Type:Competition, symposium, etc. 

  • Technical Program Committee (Signal Processing for Communications Symposium) International contribution

    IEEE ICC 2018  ( Kansas City, MO UnitedStatesofAmerica ) 2018.5

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 総合大会  ( Japan ) 2018.3

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    Type:Competition, symposium, etc. 

  • 座長

    電子情報通信学会 通信方式研究会  ( Japan ) 2018.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2018.1

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    Type:Competition, symposium, etc. 

  • Technical Program Committee International contribution

    The 32nd International Conference on Information Networking (ICOIN) 2018  ( Chiang Mai Thailand ) 2018.1

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集:Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond International contribution

    2018.1 - 2019.8

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    Type:Academic society, research group, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集:Special Section on Communication Technologies and Service Qualities in Various Access Networks International contribution

    2018.1 - 2019.7

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    Type:Academic society, research group, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2018

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:11

    Number of peer-reviewed articles in Japanese journals:2

    Proceedings of International Conference Number of peer-reviewed papers:29

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical program committee International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2017  ( Gold Coast Australia ) 2017.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2017.11 - 2017.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2017.11

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    Type:Competition, symposium, etc. 

  • Technical Program Committee International contribution

    IEEE PIMRC 2017, Fundamentals and PHY  ( Montreal Canada ) 2017.10

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会  ( Japan ) 2017.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 コミュニケーションクオリティ研究会  ( Japan ) 2017.8

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    Type:Competition, symposium, etc. 

  • Technical program committee International contribution

    IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium 2017 (APWCS2017)  ( Incheon, South Korea Korea ) 2017.8

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    Type:Competition, symposium, etc. 

  • Technical program committee International contribution

    VTC2017-Spring Workshop, (Technology Trials and Proof-of-Concept Activities for 5G and Beyond: TPoC5G)  ( Sydney Australia ) 2017.6

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 コミュニケーションクオリティ研究会  ( Japan ) 2017.5

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2017.4

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会  ( Japan ) 2017.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2017.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2017.2

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( 九州産業大学 ) 2017.1

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    Type:Competition, symposium, etc. 

  • Technical Program Committee International contribution

    The 31st International Conference on Information Networking (ICOIN) 2017  ( Da Nang Vietnam ) 2017.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2017

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:11

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:22

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical Program Committee International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2016  ( Gold Coast Australia ) 2016.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会,B-8 セッション  ( Japan ) 2016.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会,B-5B セッション  ( Japan ) 2016.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE PIMRC2016 Fundamentals & PHY  ( Valencia Spain ) 2016.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The NAFOSTED Conference on Information and Computer Science (NICS)  ( Danang City, Vietnam Japan ) 2016.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 コミュニケーションクオリティ研究会  ( Japan ) 2016.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium 2016 (APWCS2016)  ( Tokyo City University, Japan Japan ) 2016.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    22nd Asia-Pacific Conference on Communications (APCC2016)  ( Yogyakarta, Indonesia Japan ) 2016.8

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2016.7

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    Type:Competition, symposium, etc. 

  • Organization Committee Co-chair International contribution

    Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC) 2016  ( Cairo Egypt ) 2016.5 - 2016.6

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2016.4

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, BT2セッション  ( Japan ) 2016.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B5セッション  ( Japan ) 2016.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B8セッション  ( Japan ) 2016.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B11セッション  ( Japan ) 2016.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2016.2

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    Type:Competition, symposium, etc. 

  • Technical program committee memberhttp://www.platcon.org International contribution

    The 2016 International Conference on Platform Technology and Service (PlatCon-16)  ( Jeju Korea ) 2016.2

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 30th International Conference on Information Networking (ICOIN) 2016  ( Kota Kinabalu Malaysia ) 2016.1

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    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2016

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:18

    Number of peer-reviewed articles in Japanese journals:2

    Proceedings of International Conference Number of peer-reviewed papers:16

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • Technical program committee member International contribution

    International Conference on Computing, Management and Telecommunications (ComManTel 2015)  ( DaNang Vietnam ) 2015.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 9th International Conference on Signal Processing and Communication Systems, (ICSPCS’2015)  ( Japan ) 2015.12

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Advanced Technologies for Communications 2015  ( Ho Chi Minh City Vietnam ) 2015.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEEE Conference on Standards for Communication and Networking 2015 (CSCN 2015)  ( Tokyo Japan ) 2015.10

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    The 21st Asia-Pasific Conference on Communications, (APCC2015)  ( Kyoto Japan ) 2015.10

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B-5Bセッション  ( Japan ) 2015.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B-8セッション  ( Japan ) 2015.9

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    Type:Competition, symposium, etc. 

  • Technical program committee member (Fundamentals and PHY Track) International contribution

    IEEE PIMRC 2015 (2015 IEEE 25th International Symposium on Personal, Indoor and Mobile Radio Communications)  ( HongKong China ) 2015.8 - 2015.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2015.8

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    IEICE 10th Asia-Pacific Symposium on Information and Telecommunication Technologies, (APSITT 2015)  ( Colombo SriLanka ) 2015.8

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B8セッション  ( Japan ) 2015.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2015.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B5セッション  ( Japan ) 2015.3

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    Type:Competition, symposium, etc. 

  • Organization Committee Co-chair International contribution

    Japan-Egypt Conference on Electronics, Communications and Computers 2015  ( Kyushu University Japan ) 2015.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会  ( Japan ) 2015.2

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    The 29th International Conference on Information Networking (ICOIN)  ( Siem Reap Cambodia ) 2015.2

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    International Conference on Information Networking (ICOIN) 2015.  ( Siem Reap Colombia ) 2015.1

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    International Conference on Platform Technology and Service (PlatCon 2015)  ( Jeju Korea ) 2015.1

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会 英文論文誌(EB) 小特集 小特集名: IEICE Transactions on Communications, Special Section on European ICT R&D Project Activities on Broadband Access Technologies in Conjunction with Main Topics of 2015 IEICE ICT Forum), (2015). International contribution

    2015.1 - 2015.6

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    Type:Academic society, research group, etc. 

  • The technical program committee member International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2014.  ( Gold Coast Anguilla ) 2014.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2014.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    IEEE International Conference on Communication Systems  ( Macao ) 2014.11

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B8セッション  ( Japan ) 2014.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B5セッション  ( Japan ) 2014.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会 セッション  ( Japan ) 2014.8

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B5セッション  ( Japan ) 2014.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会, B8セッション  ( Japan ) 2014.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 通信方式研究会 セッション  ( Japan ) 2014.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会 セッション  ( Japan ) 2014.1

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    International Conferences on Signal Processing and Communication Systems (ICSPCS) 2013  ( Gold Coast Australia ) 2013.12

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    Type:Competition, symposium, etc. 

  • Technical Program Sub-Committee Co-chair International contribution

    Second International Japan-Egypt Conference on Electronics, Communications and Computers  ( Cairo Egypt ) 2013.12

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    平成25年度電気関係学会九州支部連合大会, 情報通信セッション  ( Japan ) 2013.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B5セッション  ( Japan ) 2013.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 ソサイエティ大会, B8セッション  ( Japan ) 2013.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2013.4

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 総合大会  ( Japan ) 2013.3

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    International Conference on Signal Processing and Communication Systems 2012 (ICSPCS2012)  ( Gold Coast Australia ) 2012.12

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    1. Seventh International Conference on Broadband and Wireless Computing, Communication and Applications (BWCCA 2012)  ( Victoria Canada ) 2012.11

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    The 15th International Symposium on Wireless Personal Multimedia Communications (WPMC2012)  ( Taipei Taiwan ) 2012.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電気関係学会九州支部第65回連合大会  ( Japan ) 2012.9

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    PIMRC2012-MAC (PIMRC2012-Track 2: MAC and Cross-Layer Design)  ( Sydney Australia ) 2012.9

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    Type:Competition, symposium, etc. 

  • The technical program committee member International contribution

    PIMRC2012-PHY (PIMRC2012-Track 1: PHY and Fundamental)  ( Sydney Australia ) 2012.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2012.6

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会総合大会  ( Japan ) 2012.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    Japan-Egypt Conference on Electronics, Communications and Computers 2012  ( Egypt ) 2012.3

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 無線通信システム研究会  ( Japan ) 2012.1

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    Type:Competition, symposium, etc. 

  • Technical Program Committee Member International contribution

    International Conference on Signal Processing and Communication Systems (ICSPCS) 2011  ( Honolulu UnitedStatesofAmerica ) 2011.12

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    Type:Competition, symposium, etc. 

  • Organizing Committee Member International contribution

    2012 Japan-Egypt Conference on Electronics, Communications and Computers  ( Alexandria Egypt ) 2011.11

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電気関係学会九州支部連合大会  ( Japan ) 2011.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会ソサイエティ大会  ( Japan ) 2011.9

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    Type:Competition, symposium, etc. 

  • Technical Program Committee Member International contribution

    IEEE ICC'2011 Communication Theory Symposium  ( Japan ) 2011.6

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    Type:Competition, symposium, etc. 

  • Technical Program Committee Member International contribution

    Sixth International Conference on Broadband and Wireless Computing, Communication and Applications 2011 (BWCCA2011)  ( Barcelona Spain ) 2011.5 - 2011.10

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    Type:Competition, symposium, etc. 

  • 電子情報通信学会英文論文誌(EB) 特集号

    2011.4 - 2011.12

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    Type:Academic society, research group, etc. 

  • 座長(Chairmanship)

    電子情報通信学会無線通信システム研究会  ( Japan ) 2011.1

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    International Symposium on Antenna and Propagation 2010 (ISAP2010)  ( MAKAO China ) 2010.11

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2009 (PIMRC2009)  ( Japan ) 2009.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    IEEE VTS Asia Pacific Wireless Communication Symposium 2009 (APWCS2009)  ( Seoul Korea ) 2009.8

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    Type:Competition, symposium, etc. 

  • Technical Program Committee Member International contribution

    IEEE International Conference on Communications 2009 Wireless Communications Symposium  ( Dresden Germany ) 2009.6

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会ソサイエティ大会  ( Japan ) 2007.9

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    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会無線通信システム研究会  ( Japan ) 2006.5

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    Type:Competition, symposium, etc. 

  • Technical program committee member International contribution

    Role(s): Review, evaluation

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    Type:Academic society, research group, etc. 

▼display all

Research Projects

  • 多素子アンテナ空間信号処理技術と融合した無線センシング技術の調査研究

    2025.4 - 2026.3

    公益財団法人電気通信普及財団   調査研究助成 

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    Authorship:Principal investigator  Grant type:Donation

  • Beyond 5Gに向けたMassive MIMOの高度化/拡張技術の研究

    2025.1 - 2025.12

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    Authorship:Principal investigator  Grant type:Joint research

  • ドローンによる農作物の監視技術とその基盤となる無線通信・センシング技術の研究

    2024.11 - 2025.3

    国立研究開発法人科学技術振興機構(JST)  国際青少年サイエンス交流事業 相補的年間交流コース 

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    Authorship:Principal investigator  Grant type:Contract research

  • デバイスフリーセンシング実現に向けたセンシング技術の研究

    2024.5 - 2025.3

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    Authorship:Principal investigator  Grant type:Joint research

  • 空間信号処理と融合したピーク電力制御・歪み補償技術の研究

    Grant number:24K07490  2024 - 2026

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    牟田 修

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    Authorship:Principal investigator  Grant type:Scientific research funding

    本研究では、多素子アンテナの自由度を活用した適応的なビーム形成とピーク電力制御技術の統合設計手法を確立する。ピークリミタと電力増幅器の非線形歪み補償の方式設計を行うとともに、それらの低演算量化・性能向上を図る。空間信号処理による干渉制御技術と併用する場合に拡張し、方式の改良を行う。総合的な特性評価を行うとともに、全体システムの設計法を確立する。

    CiNii Research

  • Terminal collaboration technology that both improves energy efficiency and communication performance

    Grant number:23H00474  2023.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    村田 英一, 岡本 英二, 井田 悠太, 丸田 一輝, 岡田 啓, 實松 豊, 西村 寿彦, 牟田 修, 田野 哲, 眞田 幸俊

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    Grant type:Scientific research funding

    無線通信システムでは限られた周波数を有効利用できる新たな技術が強く望まれている.この新技術の有力候補が,近傍端末が高速無線通信を介して互いに協調することにより疑似的な大規模 MIMOを形成し空間多重伝送を実現する端末協調である.最新の携帯端末では高周波数帯での通信機能が実装されており,これを端末間通信に活かせば端末協調が実現できる可能性が高い.本研究では,周辺に遍在する無線端末と基地局アンテナを高度に協調させることによって,複数アンテナを自在に活用した周波数利用効率とエネルギー効率の高い新たな無線システムの創出を目指す.

    CiNii Research

  • Development of Fundamental Theory for Communication and Sensing over a doubly selective channel in highly mobile environment

    Grant number:23K26104  2023.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    實松 豊, 大橋 正良, 櫻井 幸一, 牟田 修, 篠原 克寿, 森 慎太郎

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    Grant type:Scientific research funding

    本研究では、海、空、宇宙空間における通信とセンシングを行う信号処理の基礎理論構築を目指す。海中音響通信や低軌道衛星通信で課題となるのは大きなドップラー周波数である。センシングでは物体までの距離を十分高い精度で測定することを目標とする。
    本研究では、申請者らが過去に提案したGabor分割スペクトル拡散(GDSS)信号を拡張し、ドップラー周波数対策のための送信信号の設計、効果的なドップラー周波数の検出法、二重選択性フェージングの補償、高い時間周波数分解能を達成するとともに、MIMO通信/レーダまで構築することを目標とする。

    CiNii Research

  • 無線メッシュネットワークの技術開発・性能検証

    2022.12 - 2023.6

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 建設現場における無線ネットワークを活用した測位システムの研究(その2)

    2022.6 - 2024.3

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 無線センシングのための置局技術に関する検討

    2022.6 - 2023.3

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 無線メッシュネットワークの技術開発・性能検証

    2021.11 - 2022.6

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • 無線センシングのための置局技術に関する検討

    2021.5 - 2022.3

    Joint research

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    Authorship:Principal investigator  Grant type:Other funds from industry-academia collaboration

  • マイクロ波を用いた土壌消毒技術の開発

    2021 - 2023

    Japan Society for the Promotion of Science  Bilateral program

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    Authorship:Principal investigator  Grant type:Joint research

  • Toward Ubiquitous Connectivity via Unlicensed LPWANs

    Grant number:21F21074  2021 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

    牟田 修, SHAO CHENGLONG

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    Authorship:Principal investigator  Grant type:Scientific research funding

    Current unlicensed LPWANs (Low-Power Wide-Area Networks) fail to achieve the ubiquitous connectivity required by many Internet-of-Things applications and thus cannot show their full potential to satisfy the needs of this intelligent society. Therefore, to build multifunctional unlicensed LPWANs with improved connectivity between LPWAN gateways and end devices, we develop a systematic approach mainly including resilient signal reception, harmonious device transmissions, and adaptive resource allocation. A practical system study will be conducted to show the superiority of our approach.

    CiNii Research

  • テレコム先端技術研究支援センター(SCAT) 研究助成「非直交多元接続を用いるセルラー通信のための疎性を活用した基地局連携制御技術」、令和2年度~4年度(3年間)

    2020

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    Grant type:Donation

  • 電力効率に優れる無線通信のための多素子アンテナを活用した適応信号処理の開発

    Grant number:17K06427  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 二国間交流事業 相手国名(エジプト)(振興会対応機関:MOSR-STDF) 「日本アフリカ電子・通信・計算機に関する国際会議」

    2017

    Japan Society for the Promotion of Science  Bilateral program

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    Authorship:Principal investigator  Grant type:Joint research

  • 公益財団法人 電気通信普及財団 / 小セル通信ネットワークに向けた多素子MIMO無線伝送および電力線伝送技術に関する調査研究

    2017

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    Grant type:Donation

  • テレコム先端技術研究支援センター(SCAT) 研究助成 「電力効率に優れたMIMO無線通信システムのためのピーク電力制御技術」, 平成26年度~28年度(3年間)

    2014

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    Grant type:Donation

  • 無線通信回路規模を考慮した適応信号処理に関する研究

    Grant number:25420376  2013 - 2015

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 研究調査助成 / MIMO位相変調システムの送信電力効率の改善と受信回路の低消費電力化についての調査研究, 2012年4月~2014年3月(2年間)

    2012

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    Grant type:Donation

  • MIMO通信における送信ピーク電力を考慮した信号処理に関する研究

    Grant number:23760340  2011 - 2013

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 広帯域マルチキャリア無線通信システムのための適応ピーク電力抑圧技術の開発

    Grant number:19760258  2007 - 2008

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • ユビキタス情報社会を支える通信基盤技術 International coauthorship

    2006.7 - 2009.3

    九州大学(日本)、佐賀大学(日本)、北海道大学(日本)、東京工業大学(日本)、大阪大学(日本) 

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    Authorship:Coinvestigator(s) 

    The objective of this project is to investigate key technologies and related core subjects in physical layers of advanced wireless and optical communication systems under the collaboration with 5 institutions in Japan and 6 institutions in India.

  • 無線マルチキャリア信号のためのピーク電力抑圧に関する研究

    Grant number:17760313  2005 - 2006

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 学術研究助成(海外渡航援助)

    2005

      More details

    Grant type:Donation

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Educational Activities

  • The following lectures will be presented:

    Undergraduate Courses Lectures:
    - Digital Signal Processing
    - Communication Systems
    - Advanced Programming Exercise

    Graduate School Courses Lectures:
    - Exercise in Advanced Digital Communications

Class subject

  • 応用プログラミング演習

    2025.4 - Present   First semester

  • 通信方式I, II

    2024.10 - Present   Second semester

  • デジタル通信特論

    2024.10 - Present   Fall quarter

  • プログラミング演習

    2024.6 - 2024.8   Summer quarter

  • ディジタル信号処理I, II

    2024.4 - Present   First semester

  • ネットワーク工学

    2023.10 - 2024.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2023.10 - 2024.3   Second semester

  • 通信方式

    2023.10 - 2024.3   Second semester

  • デジタル通信特論

    2023.10 - 2024.3   Second semester

  • ディジタル信号処理

    2023.4 - 2023.9   First semester

  • ネットワーク工学

    2022.10 - 2023.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2022.10 - 2023.3   Second semester

  • 通信方式

    2022.10 - 2023.3   Second semester

  • デジタル通信特論

    2022.10 - 2023.3   Second semester

  • ディジタル信号処理

    2022.4 - 2022.9   First semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2021.10 - 2022.3   Second semester

  • 通信方式

    2021.10 - 2022.3   Second semester

  • デジタル通信特論

    2021.10 - 2022.3   Second semester

  • ネットワーク工学

    2021.10 - 2022.3   Second semester

  • 通信ネットワークA, B

    2021.10 - 2022.3   Second semester

  • デジタル信号処理

    2021.4 - 2021.9   First semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2020.10 - 2021.3   Second semester

  • 通信方式

    2020.10 - 2021.3   Second semester

  • デジタル通信特論

    2020.10 - 2021.3   Second semester

  • デジタル信号処理

    2020.4 - 2020.9   First semester

  • 電気情報工学入門 I

    2020.4 - 2020.9   First semester

  • デジタル通信特論

    2019.10 - 2020.3   Second semester

  • 通信方式

    2019.10 - 2020.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2019.10 - 2020.3   Second semester

  • デジタル信号処理

    2019.4 - 2019.9   First semester

  • 電気情報工学入門 I

    2019.4 - 2019.9   First semester

  • デジタル通信特論

    2018.10 - 2019.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2018.10 - 2019.3   Second semester

  • 通信方式

    2018.10 - 2019.3   Second semester

  • デジタル信号処理

    2018.4 - 2018.9   First semester

  • 電気情報工学入門 I

    2018.4 - 2018.9   First semester

  • 通信工学通論

    2017.10 - 2018.3   Second semester

  • 通信ネットワーク

    2017.10 - 2018.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2017.10 - 2018.3   Second semester

  • デジタル通信特論

    2017.10 - 2018.3   Second semester

  • 電気情報工学入門 I

    2017.4 - 2017.9   First semester

  • デジタル通信特論

    2016.10 - 2017.3   Second semester

  • 通信工学通論

    2016.10 - 2017.3   Second semester

  • 通信ネットワーク

    2016.10 - 2017.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2016.10 - 2017.3   Second semester

  • 電気情報工学入門 I

    2016.4 - 2016.9   First semester

  • デジタル通信特論

    2015.10 - 2016.3   Second semester

  • 通信工学通論

    2015.10 - 2016.3   Second semester

  • 通信ネットワーク

    2015.10 - 2016.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2015.10 - 2016.3   Second semester

  • 電気情報工学入門 I

    2015.4 - 2015.9   First semester

  • デジタル通信特論

    2014.10 - 2015.3   Second semester

  • 通信工学通論

    2014.10 - 2015.3   Second semester

  • 通信ネットワーク

    2014.10 - 2015.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2014.10 - 2015.3   Second semester

  • 電気情報工学入門 I

    2014.4 - 2014.9   First semester

  • デジタル通信特論

    2013.10 - 2014.3   Second semester

  • 通信ネットワーク

    2013.10 - 2014.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2013.10 - 2014.3   Second semester

  • 通信工学通論

    2013.10 - 2014.3   Second semester

  • デジタル通信基礎論

    2013.4 - 2013.9   First semester

  • コアセミナー

    2013.4 - 2013.9   First semester

  • デジタル通信特論

    2012.10 - 2013.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2012.10 - 2013.3   Second semester

  • 通信工学通論

    2012.10 - 2013.3   Second semester

  • デジタル通信基礎論

    2012.4 - 2012.9   First semester

  • コアセミナー

    2012.4 - 2012.9   First semester

  • 通信工学通論

    2011.10 - 2012.3   Second semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2011.10 - 2012.3   Second semester

  • デジタル通信特論

    2011.10 - 2012.3   Second semester

  • デジタル通信基礎論

    2011.4 - 2011.9   First semester

  • コアセミナー

    2011.4 - 2011.9   First semester

  • 電気情報工学実験 II (ソフトウェア実験)

    2008.10 - 2009.3   Second semester

  • 電気情報工学実験 I (ソフトウェア実験)

    2007.4 - 2007.9   First semester

  • 電気情報工学実験 I (ソフトウェア実験)

    2006.4 - 2006.9   First semester

  • 電気情報工学実験 I (ソフトウェア実験)

    2005.4 - 2005.9   First semester

  • 電気情報工学実験 I (ソフトウェア実験)

    2004.4 - 2004.9   First semester

  • 計算機プログラミング演習第III

    2003.4 - 2003.9   First semester

  • 電気情報工学実験 I ( ソフトウェア実験)

    2003.4 - 2003.9   First semester

  • 計算機プログラミング演習第III

    2002.4 - 2002.9   First semester

  • 計算機プログラミング演習第III

    2001.4 - 2001.9   First semester

  • 移動体通信基礎論

    2024.10 - 2024.12   Fall quarter

  • プログラミング演習(P)

    2024.6 - 2024.8   Summer quarter

  • ディジタル信号処理Ⅱ(EC)

    2024.6 - 2024.8   Summer quarter

  • 【通年】情報理工学講究

    2024.4 - 2025.3   Full year

  • 【通年】情報理工学研究Ⅰ

    2024.4 - 2025.3   Full year

  • 【通年】情報理工学演習

    2024.4 - 2025.3   Full year

  • 情報理工学論述Ⅰ

    2024.4 - 2024.9   First semester

  • 情報理工学論議Ⅰ

    2024.4 - 2024.9   First semester

  • 情報理工学読解

    2024.4 - 2024.9   First semester

  • ディジタル信号処理(B)【前期】

    2024.4 - 2024.9   First semester

  • ディジタル信号処理Ⅰ(EC)

    2024.4 - 2024.6   Spring quarter

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FD Participation

  • 2021.12   Role:Participation   Title:【シス情FD】企業出身教員から見た大学

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2021.11   Role:Participation   Title:【シス情FD】若手教員による研究紹介 及び 研究費獲得のポイント等について③

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2021.7   Role:Participation   Title:若手教員による研究紹介 及び 科研取得のポイント、その他について ②

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.10   Role:Participation   Title:2020年度 ユニバーシティ・デザイン・ワークショップの報告

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.9   Role:Participation   Title:科研費を獲りにいこう! 勝ち抜く気合と技術

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.9   Role:Participation   Title:電気情報工学科総合型選抜(AO入試)について

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2007.4   Role:Participation   Title:第1回全学FD

    Organizer:University-wide

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2024  Egypt-Japan University of Science and Technology  Classification:Affiliate faculty  Domestic/International Classification:Overseas 

  • 2023  Egypt-Japan University of Science and Technology  Classification:Affiliate faculty  Domestic/International Classification:Overseas 

  • 2022  愛媛大学・工学部  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2020  愛媛大学・工学部  Classification:Intensive course  Domestic/International Classification:Japan 

Outline of Social Contribution and International Cooperation activities

  • - I contributed to an international education project between Japan and Egypt, known as the Egypt-Japan University of Science and Technology (E-JUST) project, which is supported by the Japan International Cooperation Agency (JICA). Since 2025, I have been serving as the director of the Center for Japan-Egypt Cooperation in Science and Technology (E-JUST Center), focusing on collaborative international education and research with E-JUST.

    - A joint proposal with E-JUST and Jomo Kenyatta University of Agriculture and Technology (JKUAT/Kenya) for the International Youth Science Exchange Program's annual complementary exchange course was accepted in November 2024 and conducted until March 2025. Building on this initiative, since 2025, we have been conducting international collaborative research with E-JUST and JKUAT to address social challenges in Egypt and Kenya.

Educational Activities for Highly-Specialized Professionals in Other Countries

  • 2024.11 - 2025.3   国際青少年サイエンス交流事業 相補的年間交流コース

    Main countries of student/trainee affiliation:Kenya

    Other countries of student/trainee affiliation:エジプトアラブ共和国

Acceptance of Foreign Researchers, etc.

  • 日本学術振興会

    Acceptance period: 2021.4 - 2023.3   (Period):1 month or more

    Nationality:China

    Business entity:Japan Society for the Promotion of Science

  • National Research Institute of Astronomy and Geophysics(NRIAG)

    Acceptance period: 2019.4 - 2019.10  

    Nationality:Egypt

  • Nuclear Research Center

    Acceptance period: 2018.1 - 2018.6   (Period):1 month or more

    Nationality:Egypt

    Business entity:Other