Kyushu University [Osamu Muta (Associate Professor) Center for Japan-Egypt Cooperation in Science and Technology（E-JUST Center）, ]

(1) Research Project

1. Power-efficient Multi-Input Multi-Output (MIMO) Transceiver designs and related signal processing techniques

2. A multi-carrier modulation (MCM) technique for high-speed wireless communication system;
peak power reduction scheme, channel estimation scheme, erasure decoding error correction scheme for multi-carrier modulated signal

3. Nonlinear distortion compensation method for power amplifier in wireless communication system:
power amplifier is a key factor for realizing wireles communication networks. In this research, nonlinear distortion compensation method for power amplifier is proposed.

4. A multi-carrrier transmission technique for high-speed power-line communication system:
Power line communication is one of methods for realizing high-speed home networks. However, channel distortion due to frequency-selectivety of power line degrades transmission performance. In this resaerch, a multi-carrier transmission is proposed to solve this problem.

5. Spectrum detection and MIMO signal processing techniques for congnitive radio networks.

(2) Education

Undergraduate Courses Lectures:
- Laboratory of Electrical Engineering and Computer Science II
(Programming a monitor (simple OS) program by 68000 assembly language)
- Fundamentals of Communication Engineering
- Communication Network

Graduate Courses Lectures:
- Exercise in Advanced Digital Communications
- Mobile Communication

Research

Research Interests

A Machine Learning-based Object Detection Scheme utilizing Channel State Information in Wireless LANs
keyword : Machine Learning, Object Detection, Wireless LANs
2019.04.
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
2004.05.
Signal Processing Techniques for Power Line Communication Systems
keyword : Power Line Communication (PLC), Multi-Carrier Modulation, Home Network, Highspeed Transmission, Adaptive Equalization
2004.09～2009.03Demands for high-speed transmission in home network are increasing. As a method to realize such a high-speed transmission, power-line communication (PLC) techniques have been known. The advantage of the PLC is that the communication system is easily constructed without wiring works, since the existing power-line can be used for communication channel by connecting the PLC modems to the electric outlets. However, since the electric power-line is not designed as communication channel, the channel characteristics do not satisfy the required quality for transmitting a wide-band signal. The purpose of this research is to develop a high speed transmission method based on multicarrier modulation for PLC systems..
Research on MIMO Constant Envelope Modulation

keyword : MIMO, Constant Envelope Modulation
2010.04～2015.03.

Current and Past Project

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.

Academic Activities

Papers

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1.	Mohamed S. Abdalzaher, Osamu Muta, A Game-Theoretic Approach for Enhancing Security and Data Trustworthiness in IoT Applications, IEEE Internet-of-Things Journal, 10.1109/JIOT.2020.2996671, 7, 11, 11250-11261, 2020.11.
2.	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., 2020.07.
3.	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., 2020.07.
4.	Osamu Muta, Tomoya Kageyama, Performance analysis of precoded MIMO systems with adaptive peak power suppression, ITE Transactions on Media Technology and Applications, 10.3169/mta.8.2, 8, 1, 2-10, 2020.01, 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..
5.	Ahmed Nasser, Osamu Muta, Maha Elsabrouty, Haris Gacanin, Interference Mitigation and Power Allocation Scheme for Downlink MIMO-NOMA HetNet, IEEE Transactions on Vehicular Technology, 10.1109/TVT.2019.2918336, 68, 7, 6805-6816, 2019.07, 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..
6.	Wanming Hao, Osamu Muta, Haris Gacanin, Price-Based Resource Allocation in Massive MIMO H-CRANs with Limited Fronthaul Capacity, IEEE Transactions on Wireless Communications, 10.1109/TWC.2018.2869749, 17, 11, 7691-7703, 2018.11, 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..
7.	Wanming Hao, Osamu Muta, Haris Gacanin, Hiroshi Furukawa, Dynamic Small Cell Clustering and Non-Cooperative Game-Based Precoding Design for Two-Tier Heterogeneous Networks with Massive MIMO, IEEE Transactions on Communications, 10.1109/TCOMM.2017.2756934, 66, 2, 675-687, 2018.02, 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..

Presentations

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1.	Osamu Muta, Peak-amplitude-aware Precoded MIMO Systems, IEICE Information and Communication Technology Forum 2015, 2015.06.
2.	Daisuke Kanemoto, Muta Osamu, Hiroshi Furukawa, Linearity Enhancement Technique for one bit A/D converter in wireless communication devices, International Symposium on Consumer Electronics 2014 (ISCE2014), 2014.06, [URL].
3.	Muta Osamu, Introduction of Research Activities on Wireless Communications in EJUST Center, IEICE Information and Communication Technology Forum 2014, 2014.05, [URL].
4.	Daisuke Kanemoto, Muta Osamu, Furukawa Hiroshi, Takahide Sato, Makoto Ohki, A Novel Idea of One Bit Resolution ADC for Small Analog Hardware Wireless Receivers, IEEE Symposium on Low-Power and High-Speed Chips (COOL Chips XVII), 2014.04.
5.	Muta Osamu, PAPR Reduction and Related Techniques for Power Efficient Multi-Carrier/Multi-Code Communication Systems, IEICE Information and Communication Technology Forum 2013, 2013.05, [URL].
6.	Construction and Blind Estimation of Phase Sequences for Subcarrier-Phase Control Based PAPR Reduction in LDPC Coded OFDM Systems.

Membership in Academic Society

Institute of Electronics, Information and Communication Engineers (IEICE)
Institute of Electrical and Electronics Engineers (IEEE)

Awards

Chairman's award 2017, IEICE Technical Committee of Communication Systems
Chairman's award 2015, IEICE Technical Committee of Communication Systems
IEICE Communications Society:Distinguished Contributions Award
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)
IEICE Communications Society:Distinguished Contributions Award
IEICE Communications Society:Distinguished Contributions Award
2005 Active Reserach Award in Radio Communication Systems IEICE

Educational

Educational Activities

Education

Undergraduate Courses Lectures:
- Laboratory of Electrical Engineering and Computer Science II
(Programming a monitor (simple OS) program by 68000 assembly language)
- Digital signal processing
- Communication systems

Graduate Courses Lectures:
- Exercise in Advanced Digital Communications
- Mobile Communication

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