Updated on 2024/10/08

Information

 

写真a

 
JITSUMATSU YUTAKA
 
Organization
Faculty of Information Science and Electrical Engineering Department of Informatics Associate Professor
School of Engineering Department of Electrical Engineering and Computer Science(Joint Appointment)
Graduate School of Information Science and Electrical Engineering Department of Information Science and Technology(Joint Appointment)
Joint Graduate School of Mathematics for Innovation (Joint Appointment)
Title
Associate Professor
Contact information
メールアドレス
Tel
0928023624
Profile
Mathematical aspects of issues emerged in telecommunication and signal processing, such as a tradeoff between the data transmission rate and quality of communication, analog-to-digital converter and dynamical systems, random number generation, and channel impulse response estimation based on a compressed sensing theory. I have several international conference presentation every year. I also attend domestic conference. I teach signals and systems (2nd grade, 2nd semester) and information theory (3rd grade, 1st semester).

Research Areas

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

  • Informatics / Intelligent informatics

  • Informatics / Mathematical informatics

  • Informatics / Theory of informatics

  • Informatics / Soft computing

Degree

  • Ph. D (Engineering)

Research History

  • Kyushu University Faculty of Information Science and Electrical Engineering Department of Informatics Associate Professor

    2024.4 - Present

      More details

    Country:Japan

    researchmap

  • Tokyo Institute of Technology School of Engineering Associate Professor

    2021.4 - 2024.3

      More details

    Country:Japan

    researchmap

  • Kyushu University Associate Professor

    2007.2

      More details

Education

  • Kyushu University

    - 2001

      More details

  • Kyushu University

    - 2001

      More details

    Country: Japan

    researchmap

  • Kyushu University   School of Engineering

    - 1996

      More details

    Country: Japan

    researchmap

  • Kyushu University   Faculty of Engineering

    - 1996

      More details

Research Interests・Research Keywords

  • Research theme:スペクトル拡散

    Keyword:スペクトル拡散

    Research period: 2024

  • Research theme:スペクトラム拡散通信

    Keyword:スペクトラム拡散通信

    Research period: 2024

  • Research theme:カオス系列

    Keyword:カオス系列

    Research period: 2024

  • Research theme:カオス力学系

    Keyword:カオス力学系

    Research period: 2024

  • Research theme:spreading codes

    Keyword:spreading codes

    Research period: 2024

  • Research theme:random matrix

    Keyword:random matrix

    Research period: 2024

  • Research theme:neural networks

    Keyword:neural networks

    Research period: 2024

  • Research theme:Joint Sensing and Communications

    Keyword:Joint Sensing and Communications

    Research period: 2024

  • Research theme:i.i.d.2値系列

    Keyword:i.i.d.2値系列

    Research period: 2024

  • Research theme:chip waveform

    Keyword:chip waveform

    Research period: 2024

  • Research theme:CDMA通信

    Keyword:CDMA通信

    Research period: 2024

  • Research theme:CDMA communications

    Keyword:CDMA communications

    Research period: 2024

  • Research theme:CDMA

    Keyword:CDMA

    Research period: 2024

  • Research theme:associative memory

    Keyword:associative memory

    Research period: 2024

  • Research theme:Arimoto-Blahut Algorithm

    Keyword:Arimoto-Blahut Algorithm

    Research period: 2024

  • Research theme:スペクトル拡散通信

    Keyword:スペクトル拡散通信

    Research period: 2024

  • Research theme:非線形理論

    Keyword:非線形理論

    Research period: 2024

  • Research theme:電子透かし

    Keyword:電子透かし

    Research period: 2024

  • Research theme:連想記憶

    Keyword:連想記憶

    Research period: 2024

  • Research theme:確率論

    Keyword:確率論

    Research period: 2024

  • Research theme:独立同分布

    Keyword:独立同分布

    Research period: 2024

  • Research theme:無相関

    Keyword:無相関

    Research period: 2024

  • Research theme:擬似乱数系列

    Keyword:擬似乱数系列

    Research period: 2024

  • Research theme:擬似乱数生成

    Keyword:擬似乱数生成

    Research period: 2024

  • Research theme:擬似乱数

    Keyword:擬似乱数

    Research period: 2024

  • Research theme:同期捕捉

    Keyword:同期捕捉

    Research period: 2024

  • Research theme:同期・非同期

    Keyword:同期・非同期

    Research period: 2024

  • Research theme:同期ゆらぎ

    Keyword:同期ゆらぎ

    Research period: 2024

  • Research theme:マルチキャリア通信

    Keyword:マルチキャリア通信

    Research period: 2024

  • Research theme:マルコフ連鎖

    Keyword:マルコフ連鎖

    Research period: 2024

  • Research theme:ニューラルネットワーク

    Keyword:ニューラルネットワーク

    Research period: 2024

  • Research theme:チップ波形

    Keyword:チップ波形

    Research period: 2024

  • Research theme:Acceleration of acquisition of MRI images using deep neural networks

    Keyword:MRI, Deep Learning, Deep Neural Networks, Image Super Resolution

    Research period: 2017.4 - 2020.3

  • Research theme:Signal Processing for RADAR system based on Compressed Sensing

    Keyword:Compressed Sensing, Rate of Innovation, Prony's frequency estimation method

    Research period: 2014.4 - 2017.3

  • Research theme:Computation for error exponent in Converse Theorem for discrete memoryless channels

    Keyword:Correct decoding Probability, Error exponent, Iterative Algorithm

    Research period: 2014.3 - 2017.3

  • Research theme:quantization error of beta-encoders

    Keyword:analog-digital/digital-analog converters, beta-expansion, pulse code modulation (PCM), sigma-delta converter, quantization error

    Research period: 2012.10 - 2014.3

  • Research theme:multi-user detection and spin glass

    Keyword:spin glass, statistical phisics, random matrix, neural networks, associative memory

    Research period: 2005.4 - 2014.3

  • Research theme:Timing and frequency synchronization using two dimensional spreading code signal.

    Keyword:Ambiguity function, Wigner distribution, spread spectrum system

    Research period: 2001.4

Awards

  • 基礎・境界ソサイエティ貢献賞(ソサイエティ運営)

    2021.9   電子情報通信学会   基礎・境界ソサイエティ「会計幹事」としての貢献

  • 基礎・境界ソサイエティ貢献賞(編集)

    2014.9   電子情報通信学会   英文論文誌編集委員としての貢献

  • 貢献賞

    2014.9   一般社団法人 電子情報通信学会   英文論文誌編集委員としての貢献 あなたの献身的な活動は基礎・協会ソサイエティに多大なる貢献をいたしました よって本ソサイエティの表彰に関する規程によりその功労を讃えます

     More details

    英文論文誌の編集委員として,多数の論文の編集を務めた.

  • Best Paper Award

    2013.12   MACOM2013   Best Paper Award

  • Best Paper Award

    2013.12   MACOM-2013 Chairs   The Best Paper award at the 6th International Workshop on Multiple Access Communications(MACOM-2013)

     More details

    6th International Workshop on Multiple Access Communicationsにおいて Best Paper Award を 受賞した.

Papers

  • Conditional Information Leakage Given Eavesdropper's Received Signals in Wiretap Channels Reviewed International journal

    Y. Jitsumatsu, U. Michiwaki, and Y. Oohama

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   104 ( 1 )   295 - 304   2021.1

     More details

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

    DOI: 10.1587/transfun.2020EAP1017

    Other Link: https://search.ieice.org/bin/summary.php?id=e104-a_1_295&category=A&year=2021&lang=E&abst=

  • Invariant Set of Two-Dimensional Dynamics of Golden Ratio Encoders Reviewed International journal

    Yutaka Jitsumatsu

    Nonlinear Theory and Its Applications, IEICE   E12-N ( 1 )   75 - 87   2021.1

     More details

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

    DOI: 10.1587/nolta.12.75

    Other Link: https://www.jstage.jst.go.jp/article/nolta/12/1/12_75/_article

  • A New Iterative Algorithm for Computing the Correct Decoding Probability Exponent of Discrete Memoryless Channels Reviewed International journal

    Yutaka Jitsumatsu and @Yasutada Oohama

    IEEE Transactions on Information Theory   66 ( 3 )   1585 - 1606   2019.10

     More details

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

    DOI: 10.1109/TIT.2019.2950678

    Other Link: https://ieeexplore.ieee.org/document/8889422

  • Super resolution channel estimation by using spread spectrum signal and atomic norm minimization Reviewed International journal

    Dongshin Yang, Yutaka Jitsumatsu

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E101A ( 12 )   2141 - 2148   2018.12

     More details

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

    DOI: 10.1587/transfun.E101.A.2141

    Other Link: https://www.jstage.jst.go.jp/article/transfun/E101.A/12/E101.A_2141/_article

  • Dividing the grids of compressed sensing for channel estimation and investigating Markov codes Reviewed International journal

    #Dongshin Yang and Yutaka Jitsumatsu

    Nonlinear Theory and Its Applications, IEICE   9 ( 2 )   259 - 267   2018.4

     More details

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

    DOI: https://doi.org/10.1587/nolta.9.259

    Other Link: https://www.jstage.jst.go.jp/article/nolta/9/2/9_259/_article

  • A β-ary to binary conversion for random number generation using a β encoder Reviewed International journal

    7 ( 1 )   38 - 55   2016.1

     More details

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

    A β encoder is an analog-to-digital (A/D) converter, proposed by Daubechies et al. in 2002, that outputs a truncated sequence of β expansion of an input value x. It is known that the conventional pulse code modulation (PCM) that outputs the binary expansion of x is sensitive to the offset of the threshold voltage, while a β encoder is robust to such an offset. We propose an algorithm that calculates the binary expansion of an interval that is identified by an output sequence from a β encoder. Such a method is referred to as a β-ary to binary converter. We generate sequences of random numbers, using a hardware β encoder followed by the β-ary to binary converter. The randomness of the generated binary random numbers is verified by the National Institute of Standards and Technology (NIST) statistical test suite.

    DOI: http://doi.org/10.1587/nolta.7.38

    Other Link: https://www.jstage.jst.go.jp/article/nolta/7/1/7_38/_article

  • Digital Phase Updating Loop and Delay-Doppler Space Division Multiplexing for Higher Order MPSK Reviewed International journal

    YUTAKA JITSUMATSU, Tohru Kohda

    7th Int. Workshop Multiple Access Communications   8715   1 - 15   2014.12

     More details

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

    An alternative to the use of higher order Quadrature Amplitude Modulation (QAM) that shows strong variations of output amplitude is the use of higher order Phase Shift Keying (PSK). The bit error probability of higher order PSK is sensitive to phase distortion that is caused by propagation delay and Doppler frequency estimation errors. Phase Updating Loop (PUL) is a generalization of a Phase Locked Loop (PLL) that can estimate the delay and the Doppler accurately. In order to realize a higher order PSK, we recently proposed a delay-Doppler Space Division Multiplexing (dD-SDM) method in which a parameter space consisting of delay and Doppler is partitioned into several sub-spaces and each subspace has its assigned signature codes. In this paper, digital PUL is defined. Simulation results show that by the use of the dD-SDM method together with digital PUL we can successfully demodulate 256PSK data.

    DOI: 10.1007/978-3-319-10262-7_1

    Other Link: http://link.springer.com/chapter/10.1007%2F978-3-319-10262-7_1

  • Optimal Sign Patterns for a Generalized Schmidl-Cox Method Reviewed International journal

    YUTAKA JITSUMATSU, Tatsuro Higuchi, Masahiro Hashiguchi

    Sequences and Their Applications 2014   8865   269 - 279   2014.11

     More details

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

    The timing synchronization method proposed by Schmidl and Cox for orthogonal frequency division multiplexing (OFDM) systems uses a reference block consisting of two identical parts, while the one proposed by Shi and Serpedin uses a reference block consisting of four parts with a sign pattern (+1,+1,−1,+1). The accuracy of estimated delays of the latter method is higher than the former. In this paper, the number of partitions is generalized as an integer number M. Two criteria for optimization are proposed. Optimal codes with code length 5≤M≤30 are investigated.

    DOI: 10.1007/978-3-319-12325-7_23

    Other Link: http://link.springer.com/chapter/10.1007/978-3-319-12325-7_23

  • Delay-Doppler Space Division-based Multiple-Access Solves Multiple-Target Detection

    YUTAKA JITSUMATSU, Tohru Kohda, Kazuyuki Aihara

    Lecture Notes in Computer Science   8310   2013.12

  • Welch Bound for Bandlimited and Timelimited Signals Reviewed International journal

    YUTAKA JITSUMATSU

    Lecture Notes in Computer Science   7280   269 - 278   2012.9

     More details

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

  • Asynchrony, Markov, interference International journal

    Y. Jitsumatsu and T. Kohda

    RIMS Kokyuroku   1742   2011.5

     More details

    Language:English   Publishing type:Research paper (bulletin of university, research institution)  

    Other Link: http://www.kurims.kyoto-u.ac.jp/~kyodo/kokyuroku/contents/1742.html

  • Chip-Asynchronous Version of Welch Bound: Gaussian Pulse Improves BER Performance, Reviewed International journal

    Yutaka Jitsumatsu and Tohru Kohda

    Sequences and Their Applications - SETA 2006   2006.9

     More details

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

  • Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter Reviewed International journal

    Yutaka Jitsumatsu, Tahir Abbas Khan and Tohru Kohda

    IEICE Tranactions on Fundamentals   E87A ( 9 )   2301 - 2307   2004.9

     More details

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

    Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter

  • Bit error rate of incompletely synchronised correlator in asynchronous DS/CDMA system using SS Markovian codes Reviewed International journal

    Jitsumatsu, Y.; Kohda, T.

    Electronics Letters   38 ( 9 )   415 - 416   2002.4

     More details

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

    DOI: 10.1049/el:20020276

  • Brain Tumor Classification using Under-Sampled k-Space Data: A Deep Learning Approach.

    Tania Sultana, Sho Kurosaki, Yutaka Jitsumatsu, Shigehide Kuhara, Jun'ichi Takeuchi

    IEICE Transactions on Information & Systems   106 ( 11 )   1831 - 1841   2023.11   ISSN:09168532 eISSN:17451361

     More details

    Language:Others   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers  

    <p>We assess how well the recently created MRI reconstruction technique, Multi-Resolution Convolutional Neural Network (MRCNN), performs in the core medical vision field (classification). The primary goal of MRCNN is to identify the best k-space undersampling patterns to accelerate the MRI. In this study, we use the Figshare brain tumor dataset for MRI classification with 3064 T1-weighted contrast-enhanced MRI (CE-MRI) over three categories: meningioma, glioma, and pituitary tumors. We apply MRCNN to the dataset, which is a method to reconstruct high-quality images from under-sampled k-space signals. Next, we employ the pre-trained VGG16 model, which is a Deep Neural Network (DNN) based image classifier to the MRCNN restored MRIs to classify the brain tumors. Our experiments showed that in the case of MRCNN restored data, the proposed brain tumor classifier achieved 92.79% classification accuracy for a 10% sampling rate, which is slightly higher than that of SRCNN, MoDL, and Zero-filling methods have 91.89%, 91.89%, and 90.98% respectively. Note that our classifier was trained using the dataset consisting of the images with full sampling and their labels, which can be regarded as a model of the usual human diagnostician. Hence our results would suggest MRCNN is useful for human diagnosis. In conclusion, MRCNN significantly enhances the accuracy of the brain tumor classification system based on the tumor location using under-sampled k-space signals.</p>

    DOI: 10.1587/transinf.2022edp7198

    Web of Science

    Scopus

    CiNii Research

    researchmap

  • Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration

    Zhuoran Li, Osamu Muta, Yutaka Jitsumatsu

    Proceedings of the 11th International Japan-Africa Conference on Electronics, Communications, and Computations, JAC-ECC 2023   240 - 243   2023   ISBN:9798350369328

     More details

    Publishing type:Research paper (international conference proceedings)  

    User terminal collaboration is an emerging strategy for realizing spectrum- and energy-efficient wireless communication systems while improving positioning accuracy for advanced location-aware services. In this paper, we evaluate the achievable performance of a received signal strength (RSS)-based cooperative positioning scheme with user terminal collaboration, where the RSS is shared among users through direct inter-user communication at a higher frequency band. Simulation results show that user terminal collaboration significantly improves positioning accuracy in various evaluation scenarios.

    DOI: 10.1109/JAC-ECC61002.2023.10479642

    Scopus

    researchmap

  • Computation of Marton's Error Exponent for Discrete Memoryless Sources.

    Yutaka Jitsumatsu

    ISIT   2023-June   1372 - 1377   2023   ISSN:2157-8095 ISBN:9781665475549

     More details

    Authorship:Lead author, Last author, Corresponding author   Publishing type:Research paper (international conference proceedings)  

    The error exponent of fixed-length lossy source coding was established by Marton. Ahlswede showed that this exponent can be discontinuous at a rate R, depending on the probability distribution P of the given information source and the distortion measure d(x, y). The reason for the discontinuity in the error exponent is that there exists (d, ) such that the rate-distortion function R(|P) is neither concave nor quasi-concave with respect to P. Arimoto's algorithm for computing the error exponent in lossy source coding is based on Blahut's parametric representation of the error exponent. However, Blahut's parametric representation is a lower convex envelope of Marton's exponent, and the two do not generally agree. The contribution of this paper is to provide a parametric representation that perfectly matches the inverse function of Marton's exponent, thus avoiding the problem of the rate-distortion function being nonconvex with respect to P. The optimal distribution for fixed parameters can be obtained using Arimoto's algorithm. Performing a nonconvex optimization over the parameters successfully yields the inverse function of Marton's exponent.

    DOI: 10.1109/ISIT54713.2023.10206938

    Scopus

    researchmap

    Other Link: https://dblp.uni-trier.de/db/conf/isit/isit2023.html#Jitsumatsu23

  • 2D Sinc Interpolation-Based Fractional Delay and Doppler Estimation Using Time and Frequency Shifted Gaussian Pulses.

    Yutaka Jitsumatsu

    CoRR   abs/2312.04969   2023

     More details

    An accurate delay and Doppler estimation method for a radar system using time
    and frequency-shifted pulses with pseudo-random numbers is proposed. The
    ambiguity function of the transmitted signal has a strong peak at the origin
    and is close to zero if delay and Doppler are more than the inverses of the
    bandwidth and time-width. A two-dimensional (2D) sinc function gives a good
    approximation of the ambiguity function around the origin, by which fractional
    delay and Doppler are accurately estimated.

    DOI: 10.48550/arXiv.2312.04969

    arXiv

    researchmap

  • 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

    Kazuki Maruta, Yuta Ida, Yutaka Jitsumatsu, Osamu Muta, Hiraku Okada, Toshihiko NIshimura, Eiji Okamoto, Yukitoshi SSanada, Hidekazu Murata, Satoshi Dennno

    The Journal of Institute of Electronics, Information and Communication Engineering   105 ( 6 )   509 - 515   2022.6   ISSN:0913-5693

     More details

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

    Other Link: https://www.journal.ieice.org/summary.php?id=k105_6_509

  • A Family of Algorithms for Computing Information-Theoretic Forms of Strong Converse Exponents in Channel Coding and Lossy Source Coding.

    Yutaka Jitsumatsu, Yasutada Oohama

    CoRR   abs/2205.06027   2022

     More details

    The error exponent of a discrete memoryless channel is expressed in two
    forms. One is Gallager's expression with a positive slope parameter and the
    other is Csiszar and Korner's information-theoretic representation expressed
    using the mutual information and the relative entropy. They differ in
    appearance, and existing methods to prove their agreement are not elementary,
    as they require an evaluation of the KKT conditions that the optimal
    distribution must satisfy. Similarly, there are two types of expressions for
    the strong converse exponent. They are Arimoto's expression with a negative
    slope parameter and Dueck and Korner's information-theoretic expression. The
    purpose of this paper is to clarify the relation between two ways of
    representing exponents, i.e., representations using slope parameters and those
    using information-theoretic quantities, from the viewpoint of algorithms for
    computing exponents. Arimoto's algorithm is based on expression using slope
    parameters, while the authors' and Tridenski and Zamir's algorithms are based
    on Dueck and Korner's information-theoretic expression. An algorithm family
    that includes the above two algorithms as special cases was recently proposed.
    This paper clarifies that the convergence of Tridenski and Zamir's algorithm
    proves the match of Arimoto's and Dueck and Korner's exponents. We discuss
    another family of algorithms and, using the surrogate objective function used
    therein, prove that the two expressions of the error exponent coincide.
    Evaluation of the KKT condition is not needed in this proof. We then discuss
    the computation of the error and correct decoding probability exponents in
    lossy source coding. A new algorithm family for computing the source coding
    strong converse exponent is defined. The convergence of a member of the
    algorithm family implies the match of the two expressions of the strong
    converse exponent.

    DOI: 10.48550/arXiv.2205.06027

    arXiv

    researchmap

  • Conditional information leakage given eavesdropper’s received signals in wiretap channels

    104 ( 1 )   295 - 304   2021.1

     More details

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

    Information leakage in Wyner’s wiretap channel model is usually defined as the mutual information between the secret message and the eavesdropper’s received signal. We define a new quantity called “conditional information leakage given the eavesdropper’s received signals,” which expresses the amount of information that an eavesdropper gains from his/her received signal. A benefit of introducing this quantity is that we can develop a fast algorithm for computing the conditional information leakage, which has linear complexity in the code length n, while the complexity for computing the usual information leakage is exponential in n. Validity of such a conditional information leakage as a security criterion is confirmed by studying the cases of binary symmetric channels and binary erasure channels.

    DOI: 10.1587/transfun.2020EAP1017

  • A New iterative algorithm for computing the correct decoding probability exponent of discrete memoryless channels Reviewed

    Yutaka Jitsumatsu, Yasutada Oohama

    IEEE Transactions on Information Theory   66 ( 3 )   1585 - 1606   2020.3

     More details

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

    DOI: 10.1109/TIT.2019.2950678

  • A new proof of an inequality between two secrecy exponents Reviewed

    Michiwaki Ukyo, Yutaka Jitsumatsu

    Proceedings of 2018 International Symposium on Information Theory and Its Applications, ISITA 2018   747 - 751   2019.3

     More details

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

    DOI: 10.23919/ISITA.2018.8664377

  • Super Resolution Channel Estimation with Spread Spectrum Signal and Atomic Norm Minimization Reviewed

    Dongshin Yang, Yutaka Jitsumatsu

    Proceedings of 2018 International Symposium on Information Theory and Its Applications, ISITA 2018   144 - 148   2019.3

     More details

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

    DOI: 10.23919/ISITA.2018.8664379

  • Super resolution channel estimation by using spread spectrum signal and atomic norm minimization Reviewed

    Dongshin Yang, Yutaka Jitsumatsu

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E101A ( 12 )   2141 - 2148   2018.12

     More details

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

    DOI: 10.1587/transfun.E101.A.2141

  • Super Resolution Channel Estimation by Using Spread Spectrum Signal and Atomic Norm Minimization Reviewed

    Dongshin Yang, Yutaka Jitsumatsu

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E101A ( 12 )   2141 - 2148   2018.12

     More details

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

    DOI: 10.1587/transfun.E101.A.2141

  • Computation of the random coding secrecy exponent for a constant composition ensemble Reviewed

    Yutaka Jitsumatsu

    IEEE International Symposium on Information Theory - Proceedings   1713 - 1717   2017.8

     More details

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

    DOI: 10.1109/ISIT.2017.8006822

  • Compressive sensing of up-sampled model and atomic norm for super-resolution radar Reviewed

    Dongshin Yang, Yutaka Jitsumatsu

    Proceedings International Radar Symposium   2017.8

     More details

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

    DOI: 10.23919/IRS.2017.8008110

  • Computing the optimal exponent of correct decoding for discrete memoryless sources Reviewed

    Yutaka Jitsumatsu, Yasutada Oohama

    IEEE International Symposium on Information Theory - Proceedings   2016-August   1531 - 1535   2016.8

     More details

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

    DOI: 10.1109/ISIT.2016.7541555

  • Estimation of multi-path channels by using the annihilating filter method Reviewed

    Shuntaro Ito, Dongshin Yang, Yutaka Jitsumatsu

    2015 IEEE 82nd Vehicular Technology Conference, VTC Fall 2015 - Proceedings   ( VOL )   1 - 5   2016.1

     More details

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

    DOI: 10.1109/VTCFall.2015.7390934

  • A new iterative algorithm for computing the optimal exponent of correct decoding for discrete memoryless channels Reviewed

    Yasutada Oohama, Yutaka Jitsumatsu

    IEEE International Symposium on Information Theory - Proceedings   2015-June   924 - 928   2015.9

     More details

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

    DOI: 10.1109/ISIT.2015.7282590

  • Design criteria of preamble sequence for multipath fading channels with Doppler shift Reviewed

    Tatsuro Higuchi, Yutaka Jitsumatsu

    International Symposium on Wireless Personal Multimedia Communications, WPMC   2015-January   152 - 157   2015.1

     More details

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

    DOI: 10.1109/WPMC.2014.7014808

  • Rigorous Estimates of Quantization Error for A/D Converters Based on Beta-Map Reviewed International journal

    Takaki Makino, Yukiko Iwata, Katsutoshi Shinohara, YUTAKA JITSUMATSU, Masao Hotta, Hao San, Kazuyuki Aihara

    NOLTA Journal   6 ( 1 )   99 - 111   2015.1

     More details

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

    A β-encoder, a non-binary analog-to-digital converter that is based on the β-expansion, is reported to be robust to large process variations and widespread environment fluctuations. However, the quantization error of the β-encoder is complicatedly distributed and hard to be estimated due to the chaotic nature of the β-transformation. In this work, we propose an analysis method for determining an upper bound of the mean squared error of the quantization. We also provide an evaluation of the signal-to-quantization-noise ratio, which is useful for designing β-encoders.

    DOI: http://dx.doi.org/10.1587/nolta.6.99

    Other Link: https://www.jstage.jst.go.jp/article/nolta/6/1/6_99/_article

  • Phase-tuned layers with multiple 2D SS codes realize 16PSK communication Reviewed

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    IEEE Wireless Communications and Networking Conference, WCNC   457 - 462   2014.11

     More details

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

    DOI: 10.1109/WCNC.2014.6952051

  • A simple Design to Mitigate Problems of Conventional Digital Phase Locked Loop Reviewed International journal

    M. Saber, Y. Jitsumatsu, and M. T. A. Khan.

    Signal Processing: An international journal (SPIJ)   6 ( 2 )   2012.4

     More details

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

    Other Link: http://www.cscjournals.org/library/manuscriptinfo.php?mc=SPIJ-182

  • Frequency and power estimator for digital receivers in Doppler shift environments Reviewed International journal

    M. Saber, M. T. A. Khan, and Y. Jitsumatsu

    Signal Processing: An international journal (SPIJ)   5 ( 5 )   2011.12

     More details

  • A Low Power Digital Phase Locked Loop With ROM-free Numerically Controlled Oscillator Reviewed International journal

    Mohamed Saber and Yutaka Jitsumatsu and Mohammad Tahir Abbas Khan

    Signal Processing: An international journal (SPIJ)   5 ( 4 )   2011.9

     More details

  • Design and Implementation of Low Ripple Low Power Digital Phase-Locked Loop Reviewed International journal

    Mohamed Saber and Yutaka Jitsumatsu and Mohammad Tahir Abbas Khan

    Signal Processing: An international journal (SPIJ)   4 ( 6 )   2011.2

     More details

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

  • Code Acquisition in DS/CDMA Systems by Employing a Detector Based on a posteriori Probability Calculation Reviewed International journal

    M.Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu and Tohru Kohda

    IEICE Trans. on Communications   E88B ( 10 )   4047 - 4055   2005.10

     More details

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

    DOI: 10.1093/ietcom/e88-b.10.4047

  • Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter Reviewed International journal

    Yutaka Jitsumatsu, Tahir Abbas Khan and Tohru Kohda

    IEICE Tranactions on Fundamentals   E87A ( 9 )   2301 - 2307   2004.9

     More details

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

    Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter

  • Reduction of MAI in asynchronous DS/CDMA systems using post-filter Reviewed

    Yutaka Jitsumatsu, Tahir Abbas Khan, Tohru Kohda

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E87-A ( 9 )   2301 - 2307   2004.9

     More details

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

  • An a posteriori probability threshold rule for multiuser code acquisition in DS/CDMA systems Theoretical and approximate methods Reviewed

    Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda

    Unknown Journal   59 ( 3 )   1386 - 1390   2004

     More details

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

  • Markovian SS codes imply inversion-free code acquisition in asynchronous DS/CDMA systems Reviewed

    Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda

    Unknown Journal   4   2004

     More details

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

  • On the self-interferences of SS codes generated by a Markov chain Reviewed

    Yutaka Jitsumatsu, T. Kohda

    Unknown Journal   67   2002

     More details

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

  • On the number of solutions for a class of piecewise-linear equations related to transistor circuits Reviewed

    Yutaka Jitsumatsu, T. Nishi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E84-A ( 9 )   2221 - 2229   2001.9

     More details

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

  • An upper bound for the number of solutions of a piecewise-linear equation related to two-transistor circuits Reviewed

    Y. Jitsumatsu, T. Nishi

    Research Reports on Information Science and Electrical Engineering of Kyushu University   6 ( 1 )   99 - 106   2001.3

     More details

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

  • An upper bound for the number of solutions of a piecewise-linear equation related to two-transistor circuits Reviewed

    Yutaka Jitsumatsu, Tetsuo Nishi

    Research Reports on Information Science and Electrical Engineering of Kyushu University   6 ( 1 )   103 - 105   2001

     More details

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

  • Relation between the stored and the dissipated energies of a circuit composed of linear capacitors, linear/nonlinear resistors and dc voltage sources Reviewed

    Yutaka Jitsumatsu, Tetsuo Nishi

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E82-A ( 9 )   1802 - 1808   1999

     More details

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

▼display all

Presentations

  • Arimoto の指数計算アルゴリズム

    實松豊

    2023年電子情通信学会総合大会  2023.3  電子情報通信学会

     More details

    Event date: 2023.3

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue:埼玉   Country:Japan  

    Other Link: https://www.ieice.org/publications/conferences/summary.php?id=CONF0000139534&expandable=0&ConfCd=2023G&session_num=AT-1&lecture_number=AT-1-5&year=2023&conf_type=G

  • 盗聴信号が与えられた下での情報漏洩量の定義とその確率分布

    #道脇 右京, @實松 豊, @大濱 靖匡

    第41回情報理論とその応用シンポジウム  2018.12 

     More details

    Event date: 2018.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福島県いわき市   Country:Japan  

    In Wyner's wiretap channel model, it was proved that there exists a pair of encoding and decoding methods that can accurately transmit information to the legitimate receiver whereas deceiving eavesdroppers.
    To ensure the secureness of a given pair of encoding and decoding methods, the amount of information leakage to the eavesdropper should be evaluated.
    However, the calculation of the information leakage takes exponential time for the number of bits of messages and the codeword length respectively.
    In this paper, we introduce a new notion of information leakage given the eavesdropper's received signal (wiretapped signal) and discuss its behavior.
    Under this definition, we examine the information leakage for binary symmetric channel and binary erasure channel.

  • Super Resolution Channel Estimation with Spread Spectrum Signal and Atomic Norm Minimization International conference

    Dongshin Yang and Yutaka Jitsumatsu

    2018 International Symposium on Information Theory and Its Applications (ISITA)  2018.10 

     More details

    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Singapore  

    Other Link: https://ieeexplore.ieee.org/document/8664379

  • Mean Square Quantization Error of Golden Ratio Encoders International conference

    Koji Itaya, YUTAKA JITSUMATSU

    Int. Symp. Nonliner Theory and its Application (NOLTA2017)  2017.12 

     More details

    Event date: 2017.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Mexico  

    Other Link: https://www.epapers.org/nolta2017/ESR/session_sched_view.php

  • On computation of secrecy exponent functions

    Yutaka Jitsumatsu

    The 40th Symp. on Inform. Theory and its Applications (SITA2017)  2017.11 

     More details

    Event date: 2017.11 - 2017.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    On computation of secrecy exponent functions

    Other Link: http://www.ieice.org/ess/sita/SITA2017/program/index_e.html

  • Channel Estimation by Using Spread Spectrum Signal and Atomic Norm Minimization

    #D. Yang and Y. Jitsumatsu

    The 40th Symp. on Inform. Theory and its Applications (SITA2017)  2017.11 

     More details

    Event date: 2017.11 - 2017.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    On computation of secrecy exponent functions

    Other Link: http://www.ieice.org/ess/sita/SITA2017/program/index_e.html

  • Compressive Sensing of Up-Sampled Model and Atomic Norm for SuperResolution Radar International conference

    Dongshin Yang, YUTAKA JITSUMATSU

    2017 Int. Radar Sympo. (IRS2017)  2017.6 

     More details

    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Czech Republic  

    Other Link: http://www.dgon-irs.org/fileadmin/templates/dokumente_irs/Programme_IRS-2017-Online.pdf

  • Computation of the Random Coding Secrecy Exponent for a Constant Composition Ensemble International conference

    YUTAKA JITSUMATSU

    Proc. Int. Sympo. Inform. Theory  2017.6 

     More details

    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

    Other Link: http://www.isit2017.org/

  • Estimation of Beta-Value for Pipelined Beta Encoders International conference

    Yeelai Chew, YUTAKA JITSUMATSU

    Int. Symp. Nonliner Theory and its Application (NOLTA2016)  2016.11 

     More details

    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: http://www.epapers.org/nolta2016/ESR/session_sched_view.php?sched_id=1

  • Random Number Generation Using Outputs from Multiple Beta Encoders International conference

    Koji Itaya, YUTAKA JITSUMATSU

    Int. Symp. Nonliner Theory and its Application (NOLTA2016)  2016.11 

     More details

    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: http://www.epapers.org/nolta2016/ESR/session_sched_view.php?sched_id=1

  • Discretization in Channel Estimation Using Compressed Sensing and Its Performance Improvement International conference

    Dongshin Yang, YUTAKA JITSUMATSU

    13th IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS 2016)  2016.8 

     More details

    Event date: 2016.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: http://apwcs2016.cn.tcu.ac.jp/program.html

  • Computing the Optimal Exponent of Correct Decoding for Discrete Memoryless Sources International conference

    YUTAKA JITSUMATSU, Yasutada Oohama

    Proc. Int. Sympo. Inform. Theory  2016.7 

     More details

    Event date: 2016.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

    Other Link: http://www.isit2016.org/

  • A New Iterative Algorithm for Computing the Optimal Exponent of Correct Decoding Probability for Discrete Memoryless Channels under Input Constraint

    2015.11 

     More details

    Event date: 2015.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Estimation of Multi-path Channels by Using the Annihilating Filter Method International conference

    Shuntaro Ito, Dongshin Yang, YUTAKA JITSUMATSU

    2015 IEEE 82nd Vehicular Technology Conference  2015.9 

     More details

    Event date: 2015.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    Estimation of Multi-path Channels by Using the Annihilating Filter Method

    Other Link: http://www.ieeevtc.org/vtc2015fall/

  • A New Iterative Algorithm for Computing the Optimal Exponent of Correct Decoding for Discrete Memoryless Channels International conference

    Yasutada Oohama, YUTAKA JITSUMATSU

    Int. Sympo. Inform. Theory 2015  2015.6 

     More details

    Event date: 2015.6

    Language:English   Presentation type:Oral presentation (general)  

    Other Link: http://isit2015.org/

  • Optimal Sign Patterns for a Generalized Schmidl-Cox Method International conference

    YUTAKA JITSUMATSU, Masahiro Hashiguchi, Tatsuro Higuchi

    Sequences and Their Applications 2014  2014.11 

     More details

    Event date: 2014.11

    Language:English  

    Country:Australia  

    Other Link: http://www.springer.com/gp/book/9783319123240

  • Performance Analysis of a Time Synchronization Method for Multipath Fading Channels with Doppler Shift International conference

    Tatsuro Higuchi, YUTAKA JITSUMATSU

    17th Int. Symp. on Wireless Personal Multimedia Commun. (WPMC2014)  2014.9 

     More details

    Event date: 2014.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Australia  

    Other Link: https://wpmc2014.org/

  • Phase-tuned layers with multiple 2D SS codes realize 16PSK communication International conference

    YUTAKA JITSUMATSU, Tohru Kohda, Kazuyuki Aihara

    2014 IEEE Wireless Communications and Networking Conference  2014.4 

     More details

    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  • Delay-Doppler Space Division- based Multiple-Access Solves Multiple-Target Detection International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    6th International Workshop on Multiple Access Communications(MACOM2013)  2013.12 

     More details

    Event date: 2013.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

    Other Link: http://www.macom.ws/

  • Recovering noncoherent MPSK signal with unknown delay and Doppler using its ambiguity function International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    4th International Workshop on Recent Advances in Broadband Access Networks(RABAN2013)  2013.11 

     More details

    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Finland  

    Other Link: http://www.cs.tut.fi/RABAN/

  • PLL-free Receiver for Gabor Division/Spread Spectrum System International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    The 9th IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob2013)  2013.10 

     More details

    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

    Other Link: http://conferences.computer.org/wimob2013/

  • Signals that can be easily time-frequency synchronized from their ambiguity function International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    IEEE Information Theory Workshop 2013(ITW2013)  2013.9 

     More details

    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

    Other Link: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6691301&sortType%3Ddesc_p_Publication_Year%26queryText%3DYutaka+Jitsumatsu

  • Gabor Division/Spread Spectrum System is Separable in Time and Frequency Synchronization International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    2013 IEEE 78th Vehicular Technology Conference: VTC2013-Fall  2013.9 

     More details

    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    Other Link: http://www.ieeevtc.org/vtc2013fall/index.php

  • Spread Spectrum-Based Cooperative and individual time-frequency synchronization International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    The Tenth International Symposium on Wireless Communication Systems(ISWCS2013)  2013.8 

     More details

  • Separability of Time-Frequency Synchronization International conference

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    International Radar Symposium 2013 (IRS2013)  2013.6 

     More details

    Event date: 2013.6

    Language:English  

    Country:Germany  

    Other Link: http://www.irs-2013.de/welcome

  • Frequency-division spread-spectrum makes frequency synchronisation easy International conference

    YUTAKA JITSUMATSU, Tohru Kohda, Kazuyuki Aihara

    IEEE Globecom 2012  2012.12 

     More details

    Event date: 2012.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Markovian SS Codes Flatten the Spectrum of UWB Gaussian Pulse International conference

    Tohru Kohda and Yutaka Jitsumatsu and Kazuyuki Aihara

    2011 IEEE Int. Conf. on Ultrawide band  2011.9 

     More details

    Event date: 2011.9 - 2011.10

    Presentation type:Oral presentation (general)  

    Country:Italy  

  • 2D Markovian SS codes flatten Time-frequency distribution of signals in asynchronous Gabor division CDMA systems International conference

    T. Kohda and Y. Jitsumatsu

    2011 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP2011)  2011.5 

     More details

    Event date: 2011.5

    Country:Czech Republic  

  • Frequency division (FD)-based CDMA system which permits frequency offset International conference

    T. Kohda, Y. Jitsumatsu, K. Fujino and K. Aihara

    2010 Int. Sympo. on Spread Spectrum Techniques and Applications (ISSSTA2010)  2010.10 

     More details

    Event date: 2010.10

    Country:Taiwan, Province of China  

  • Quasi-Orthogonal Multi-Carrier CDMA International conference

    Yutaka Jitsumatsu and Tohru Kohda

    IEEE Globecom 2008  2008.12 

     More details

    Event date: 2008.11 - 2008.12

    Presentation type:Oral presentation (general)  

    Country:United States  

  • Markov codes make Gaussian pulse superior to a raised cosine pulse International conference

    Yutaka Jitsumatsu and Tohru Kohda

    10th IEEE Int. Symp. Spread Spectrum Techniques and Applications  2008.8 

     More details

    Event date: 2008.8

    Presentation type:Oral presentation (general)  

    Country:Italy  

  • Prolate spheroidal wave functions induce Gaussian chip waveforms International conference

    Yutaka Jitsumatsu and Tohru Kohda

    2008 IEEE Int. Symp. Inform. Theory (ISIT)  2008.7 

     More details

    Event date: 2008.7

    Presentation type:Oral presentation (general)  

    Country:Canada  

  • Welch Bound for FIR Lowpass Filtered Sequences International conference

    Yutaka Jitsumatsu and Tohru Kohda

    2007 IEEE Int. Symp. Inform. Theory  2007.6 

     More details

    Presentation type:Oral presentation (general)  

    Country:France  

  • A lower bound on the mean squared correlations for band-limited asynchronous DS/CDMA systems International conference

    Yutaka Jitsumatsu and Tohru Kohda

    Proc. of 2006 IEEE Int. Symp. on. Information Theory  2006.7 

     More details

    Presentation type:Oral presentation (general)  

    Country:United States  

  • Chip-Asynchronous Version of Welch Bound: Gaussian Pulse Improves BER Performance International conference

    Yutaka Jitsumatsu and Tohru Kohda

    Sequences and Their Applications - SETA 2006  2006.9 

     More details

    Presentation type:Oral presentation (general)  

    Country:China  

  • Gaussian Chip Waveform Together with Markovian Spreading Codes Improve BER Performacnce in Chip-Asynchronous CDMA Systems International conference

    Yutaka Jitsumatsu and M. Tahir Abbas Khan and Tohru Kohda

    Proc. of Globecom 2006  2006.11 

     More details

    Presentation type:Oral presentation (general)  

    Country:United States  

  • Delay-Doppler Estimation for Joint Sensing and Communications International conference

    Yutaka Jitsumatsu

    Mathematics for Innovation in Information and Communication Technology  2024.9  Institute of Mathematics for Industry, Kyushu University

     More details

    Event date: 2024.9

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

    Other Link: https://joint.imi.kyushu-u.ac.jp/post-15347/

  • Performance Evaluation of Cooperative Positioning with User-Terminal Collaboration

    Li,Z., Muta, O., Jitsumatsu, Y

    2024.9  IEICE

     More details

    Event date: 2024.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20240925Hc4E/eng/

  • Signal design for delay and Doppler estimation Invited

    Yutaka Jitsumatsu

    Radio Communication Systems, IEICE  2024.7  IEICE

     More details

    Event date: 2024.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sapporo   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/202407197cEI/eng/

  • On β-ary to binary conversion from an engineering point of view International conference

    Yutaka Jitsumatsu

    Numeration 2024  2024.6 

     More details

    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Utrecht   Country:Netherlands  

    Other Link: https://numeration-2024.sciencesconf.org/

  • Gabor分割スペクトル拡散方式によるパルスレーダにおける遅延・ドップラー推定の高精細化

    電子情報通信学会無線通信システム研究会  2024.1 

     More details

    Event date: 2024.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Other Link: https://ken.ieice.org/ken/paper/20240119pCZJ/eng/

  • 有歪み情報源符号化における誤り指数の不連続性について

    實松豊

    第46回情報理論とその応用シンポジウム  2023.11  電子情報う新学会

     More details

    Event date: 2023.11 - 2023.12

    Language:English   Presentation type:Poster presentation  

    Venue:山口   Country:Japan  

  • 時間・周波数領域スペクトル拡散信号によるレーダ

    實松豊

    令和5年度情報数理ワークショップ  2023.11  科学研究費補助金『高速移動に伴う二重選択性通信路を介した通信及びセンシングの基礎理論構築』

     More details

    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

  • MRIのマルチパラメータマッピングにおける適応的撮像パラメータ選択

    張慧杰, 久原重英, 竹内純一, 實松豊

    電子情報通信学会 医用画像研究会  2023.9  電子情報通信学会

     More details

    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20230908FCwu/

  • A Radar Waveform Design for Joint Estimation of Time Delay and Doppler Frequency Invited

    Yutaka Jitsumatsu

    2023.5  IEICE

     More details

    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Kyoto   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20230511wCUr/eng/

  • Nested Lattice Codes With Regular Simplex Coarse Lattices

    Leli Han, Yutaka Jitsumatsu

    The 45th Symposium on Information Theory and Its Applications  2022.12  IEICE

     More details

    Event date: 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Kobe   Country:Japan  

    Other Link: https://www.ieice.org/ess/sita/SITA2021/program/index_e.html

  • 時間・周波数領域スペクトル拡散信号に基づく遅延とドップラー周波数の同時推定

    實松豊

    第45回情報理論とその応用シンポジウム  2022.12  電子情報通信学会

     More details

    Event date: 2022.11 - 2022.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:登別   Country:Japan  

    Other Link: https://www.ieice.org/ess/sita/SITA2022/

  • 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  電子情報通信学会

     More details

    Event date: 2022.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:愛媛   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20221028cCNA/eng/

  • 機械学習に基づくMulti-Parameter Mapping (MPM)の推定精度改善

    張慧杰, 河野乙馬,實松豊,久原重英,竹内純一

    第50回磁気共鳴医学会大会  2022.9 

     More details

    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Other Link: https://confit.atlas.jp/guide/event/jsmrm2022/subject/_OS02-6/date?cryptoId=

  • 時間領域と周波数領域のスペクトル拡散信号に基づく伝搬遅延とドップラー周波数の推定

    實松豊

    電子情報通信学会非線形問題研究会  2022.8  電子情報通信学会

     More details

    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20220802zCME/eng/

  • 有歪み情報源符号化の正復号指数を求める新しいアルゴリズム

    實松豊

    電子情報通信学会情報理論研究会  2022.7  電子情報通信学会

     More details

    Event date: 2022.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20220721NCKz/eng/

  • A sequence design for a Phase-Coded Pulse radar using Discrete Prolate Spheroidal Sequences

    Yutaka Jitsumatsu

    IEICE, Signal Processing   2022.5  IEICE

     More details

    Event date: 2022.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Kumamoto   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20220519MCKb/eng/

  • Estimating the permeability of rocks using three-dimensional CNN and ResNet

    Taro Kamamo, Yutaka Jitsumatsu, Takeshi Tsuji

    2022.3  IEICE

     More details

    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20220303vCiK/eng/

  • 畳み込みニューラルネットワークによる岩石物性の推定

    #釜野 太郎, 實松 豊 @辻 建

    電子情報通信学会信号処理研究会  2021.5 

     More details

    Event date: 2021.5

    Language:Japanese  

    Country:Japan  

    Other Link: https://ci.nii.ac.jp/naid/40022264980/en/

  • Approximate formula of the mean square quantization error of golden ratio encoders

    Yoshikatsu Kashiwabara, Yutaka Jitsumatsu

    Nonlinear Problem, IEICE  2021.3  IEICE

     More details

    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20210316GC2W/eng/

  • MRI Tumor Recognition Based on Transfer Learning

    Jiangchen Wei, Yutaka Jitsumatsu

    2020.12  IEICE

     More details

    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20201202zCBd/eng/

  • Downlink Non-Orthogonal Multiple Access (NOMA) Using sparse superposition codes

    Hayato Tachiwana, Yutaka Jitsumatsu

    2020.12  IEICE

     More details

    Event date: 2020.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Online   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20201203fCBH/eng/

  • 畳み込みニューラルネットワークによる岩石物性の推定

    釜野太郎・實松 豊・辻 建

    電子情報通信学会 信号処理研究会  2020.5  電子情報通信学会

     More details

    Event date: 2020.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/2020052931Yl/eng/

  • Accuracy of Brain Tumor Detection and Classification Based on Under Sampled k-Space Signals

    Tania Sultana・Sho Kurosaki・Yutaka Jitsumatsu・Junichi Takeuchi

    2020.3  IEICE

     More details

    Event date: 2020.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto   Country:Japan  

    Other Link: https://ken.ieice.org/ken/paper/20200311T1XT/eng

  • Cooperative Jamming における妨害者の計画的設置の検討 Invited

    #渡邉 一輝, 實松 豊

    電子情報通信学会,通信方式研究会  2020.2 

     More details

    Event date: 2020.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 大規模マシンタイプ通信におけるスパース重ね合わせ符号

    #立和名 隼人, 實松 豊

    電子情報通信学会,通信方式研究会  2020.2 

     More details

    Event date: 2020.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Develop a method to estimate elastic velocity directly from digital rock model, based on convolutional neural network

    Koki Shige, Takeshi Tsuji, Yutaka Jitsumatsu, Tatsunori Ikeda Fei Jiang, Kazuki Sawayama

    Proceedings of the SEGJ Conference  2020 

     More details

    Event date: 2020

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: https://jglobal.jst.go.jp/en/detail?JGLOBAL_ID=202002271261005580

  • スパース重ね合わせ符号による多元接続の性能評価

    #立和名 隼人, 實松 豊

    第42回情報理論とその応用シンポジウム  2019.11 

     More details

    Event date: 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:霧島市,鹿児島県   Country:Japan  

  • テプリッツ行列の低ランク補間のMRIへの応用

    #佐藤 大祥, 實松 豊

    第42回情報理論とその応用シンポジウム  2019.11 

     More details

    Event date: 2019.11

    Language:Japanese   Presentation type:Symposium, workshop panel (public)  

    Venue:霧島市,鹿児島県   Country:Japan  

  • スパース重ね合わせ符号を用いた多元接続の誤り率の性能

    #立和名 隼人, 實松 豊

    革新的無線通信技術に関する横断型研究会 (MIKA)  2020.10 

     More details

    Event date: 2019.10

    Language:Japanese  

    Country:Japan  

  • 深層学習超解像を用いた磁気共鳴血管画像の復元

    #北崎自然, @川喜田 雅則, @實松 豊, @久原 重英, @樋渡 昭雄, @竹内 純一

    情報論的学習理論研究会  2019.3 

     More details

    Event date: 2019.3

    Language:Japanese  

    Country:Japan  

  • 二元対称消失盗聴通信路における条件付き情報漏洩量の分布

    #道脇 右京, @實松 豊, @大濱 靖匡

    情報理論研究会  2019.2 

     More details

    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都   Country:Japan  

  • A new proof of an inequality between two secrecy exponents

    Michiwaki Ukyo, Yutaka Jitsumatsu

    15th International Symposium on Information Theory and Its Applications, ISITA 2018  2019.3 

     More details

    Event date: 2018.10

    Language:English  

    Country:Singapore  

  • A new proof of an inequality between two secrecy exponents International conference

    #U. Michiwaki and @Y. Jitsumatsu

    2018 Int. Sympo. on Inform. Theory and Its Appl. (ISITA)  2018.10 

     More details

    Event date: 2018.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Singapore  

    Other Link: https://ieeexplore.ieee.org/document/8664377

  • Super Resolution Channel Estimation with Spread Spectrum Signal and Atomic Norm Minimization

    Dongshin Yang, Yutaka Jitsumatsu

    15th International Symposium on Information Theory and Its Applications, ISITA 2018  2019.3 

     More details

    Event date: 2018.10

    Language:English  

    Country:Singapore  

  • 深層学習超解像を用いたMRI再構成の検討

    #北崎自然, @川喜田 雅則, @實松 豊, @久原 重英, @樋渡 昭雄, @竹内 純一

    情報論的学習理論研究会  2018.9 

     More details

    Event date: 2018.9

    Language:Japanese  

    Country:Japan  

  • Compressive sensing of up-sampled model and atomic norm for super-resolution radar

    Dongshin Yang, Yutaka Jitsumatsu

    18th International Radar Symposium, IRS 2017  2017.8 

     More details

    Event date: 2017.6

    Language:English  

    Country:Czech Republic  

  • Computation of the random coding secrecy exponent for a constant composition ensemble

    Yutaka Jitsumatsu

    2017 IEEE International Symposium on Information Theory, ISIT 2017  2017.8 

     More details

    Event date: 2017.6

    Language:English  

    Country:Germany  

  • 超解像の応用によるMRIの高速化に関する検討

    中島綾香, 川喜田雅則, 實松豊, 久原重英, 竹内純一

    情報理論研究会  2017.3 

     More details

    Event date: 2017.3 - 2007.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 正復号指数を求める新しい分布更新アルゴリズム

    道脇 右京, 實松 豊

    第1回情報理論および符号理論とその応用ワークショップ  2017.2 

     More details

    Event date: 2017.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:佐賀県唐津市   Country:Japan  

    Other Link: http://www.ma.is.saga-u.ac.jp/~hirotomo/ica2017/

  • Atomic Normを用いた線スペクトル推定法の性能評価

    西部 洋介, 實松 豊

    電子情報通信学会 情報理論研究会  2017.1 

     More details

    Event date: 2017.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪   Country:Japan  

    Other Link: http://www.ieice.org/ken/paper/20170120mbPD/

  • β進/2進変換に基づく乱数生成アルゴリズムの性能評価

    小田 晃平, 實松 豊

    電子情報通信学会 情報理論研究会  2017.1 

     More details

    Event date: 2017.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪   Country:Japan  

    Other Link: http://www.ieice.org/ken/paper/20170120mbPD/

  • Computing the optimal exponent of correct decoding for discrete memoryless sources

    Yutaka Jitsumatsu, Yasutada Oohama

    2016 IEEE International Symposium on Information Theory, ISIT 2016  2016.8 

     More details

    Event date: 2016.7

    Language:English  

    Country:Spain  

  • 圧縮センシングに基づく通信路推定法におけるパラメータの離散化問題

    梁 同信, 實松 豊

    電子情報通信学会総合大会  2016.3 

     More details

    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

  • 連続値パラメータ推定における圧縮センシングの手法の性能比較

    西部洋介, 古賀郁海, 實松 豊

    電子情報通信学会総合大会  2016.3 

     More details

    Event date: 2016.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Fukuoka   Country:Japan  

    レーダーは電波を発信し検出すべき物体からの反射波を観測することで,
    物体の速度と位置を検出する装置である.近年,圧縮センシングの枠組
    みを利用してレーダーの解像度を向上させる研究が行われている.圧縮セン
    シングの解法を利用するためには,位置と速度のパラメータ空間を離散化
    する必要がある.しかし,真のパラメータの値が離散化されたグリッドの
    中間に位置すると,物体の見逃しや誤検出を引き起こす問題があった.
    この問題に対し,Tangらはatomic
    normという新しいノルムの概念を導入し,パラメータ空間の離散

  • β変換器におけるβ値の最尤推定

    周 諭来, 實松 豊

    電気学会電子回路研究会  2016.1 

     More details

    Event date: 2016.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡   Country:Japan  

  • 複数のβ変換器出力を用いた乱数生成

    板谷 浩志, 實松 豊

    電気学会電子回路研究会  2016.1 

     More details

    Event date: 2016.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡   Country:Japan  

  • Performance Evaluation of a Random Number Generation Using a Beta Encoder International conference

    YUTAKA JITSUMATSU

    Proc of 2015 Int. Symp. Nonliner Theory and its Application (NOLTA2015)  2015.12 

     More details

    Event date: 2015.12

    Language:English   Presentation type:Oral presentation (general)  

    Other Link: http://www.nolta2015.org/

  • Estimation of multi-path channels by using the annihilating filter method

    Shuntaro Ito, Dongshin Yang, Yutaka Jitsumatsu

    82nd IEEE Vehicular Technology Conference, VTC Fall 2015  2016.1 

     More details

    Event date: 2015.9

    Language:English  

    Country:United States  

  • 実数βを基数とするA/D変換器におけるβの推定値の更新法

    小田 晃平, 實松 豊

    電子情報通信学会 情報理論研究会  2015.7 

     More details

    Event date: 2015.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京工業大学   Country:Japan  

    現在主に使われているアナログ/ディジタル(A/D)変換方式として,デルタシグマ($DeltaSigma$)変調とパルス符号変調(Pulse Code Modulation: PCM)がある.
    前者は,量子化精度が非常に高い代わりに変換速度が遅い.後者は,高速な変換が可能だが,精度は中程度である.
    Daubechiesらは両方の長所を兼ね揃えた新しいA/D変換方式として,実数値の$beta$進展開に基づく$beta$変換器を提案した.
    $beta$変換器を実装するには,$beta$の値を正確に推定することが必要である.
    ここで$beta$は,$1<beta<2$を満たす実数である.$beta$の値を正確に推定する方法として,Daubechiesらは,$gamma=beta^{-1}$に関する特性方程式の根を求める方法を提案した.
    Sanらは$gamma$のべきの有限桁数の2進小数表現を大量にLook-Up Table(LUT)に保存することで上記の特性多項式の根を求める回路を実装した.
    本稿ではLUTのサイズと計算量の削減を同時に達成するための手法を提案する.

    Other Link: http://www.ieice.org/ken/paper/20150714XbBD/

  • A new iterative algorithm for computing the optimal exponent of correct decoding for discrete memoryless channels

    Yasutada Oohama, Yutaka Jitsumatsu

    IEEE International Symposium on Information Theory, ISIT 2015  2015.9 

     More details

    Event date: 2015.6

    Language:English  

  • Optimal Reference Block Partitions for Multipath Fading Channels with Doppler Shift International conference

    YUTAKA JITSUMATSU, Dongshin Yang, Tatsuro Higuchi

    The Third Int. Japan-Egypt Conf. on Electronics, Commun. and Comp.  2015.3 

     More details

    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: https://sites.google.com/a/ejust.kyushu-u.ac.jp/3ed-jec-ecc-2015/

  • A Random Binary Sequence Generator Based on beta Encoders International conference

    YUTAKA JITSUMATSU, Kazuya Matsumura

    Workshop on $\beta$-transformation and related topics  2015.3 

     More details

    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: http://www.imi.kyushu-u.ac.jp/publishes/pub_inner/id:2

  • Design criteria of preamble sequence for multipath fading channels with Doppler shift

    Tatsuro Higuchi, Yutaka Jitsumatsu

    2014 International Symposium on Wireless Personal Multimedia Communications, WPMC 2014  2015.1 

     More details

    Event date: 2014.9

    Language:English  

    Country:Australia  

  • Digital Phase Updating Loop and Delay-Doppler Space Division Multiplexing for Higher Order MPSK International conference

    7th Int. Workshop Multiple Access Communications (MACOM2014)  2014.8 

     More details

    Event date: 2014.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Sweden  

    Other Link: http://www.springer.com/gp/book/9783319102610#

  • Phase-tuned layers with multiple 2D SS codes realize 16PSK communication

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2014 IEEE Wireless Communications and Networking Conference, WCNC 2014  2014.11 

     More details

    Event date: 2014.4

    Language:English  

    Country:Turkey  

  • 通信の同期法と連想記憶の想起過程

    實松 豊, 香田 徹, 合原 一幸

    第5回 符号と力学系ワークショップ  2014.3 

     More details

    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡市   Country:Japan  

  • 非同期CDMAと連想記憶

    實松 豊, 香田 徹, 合原 一幸

    第5回 符号と力学系ワークショップ  2014.3 

     More details

    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡市   Country:Japan  

  • β写像アトラクタに基づく擬似乱数生成器の回路実装とその乱数検定

    實松 豊, 松村 和也, 香田 徹

    電子回路研究会  2014.1 

     More details

    Event date: 2014.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢市   Country:Japan  

  • 通信の同期問題に関する一考察

    實松 豊, 香田 徹, 合原 一幸

    第4回 安全・安心な生活のための情報通信システム(ICSSSL)研究会  2013.12 

     More details

    Event date: 2013.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都   Country:Japan  

  • Recovering noncoherent MPSK signal with unknown delay and Doppler using its ambiguity function

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2013 13th International Conference on ITS Telecommunications, ITST 2013  2013.1 

     More details

    Event date: 2013.11

    Language:English  

    Country:Finland  

  • PLL-free receiver for Gabor division/spread spectrum system

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2013 IEEE 9th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2013  2013.12 

     More details

    Event date: 2013.10

    Language:English  

    Country:France  

  • Signals that can be easily time-frequency synchronized from their ambiguity function

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2013 IEEE Information Theory Workshop, ITW 2013  2013.12 

     More details

    Event date: 2013.9

    Language:English  

    Country:Spain  

  • Gabor division/spread spectrum system is separable in time and frequency synchronization

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013  2013 

     More details

    Event date: 2013.9

    Language:English  

    Country:United States  

  • Spread spectrum-based cooperative and individual time-frequency synchronization

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    10th IEEE International Symposium on Wireless Communication Systems 2013, ISWCS 2013  2013.1 

     More details

    Event date: 2013.8

    Language:English  

    Country:Germany  

  • 通信における時間同期と周波数同期の分離可能条件

    實松 豊, 香田 徹, 合原 一幸

    電子情報通信学会 短距離無線研究会  2013.8 

     More details

    Event date: 2013.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都   Country:Japan  

  • Digital phase updating loop and delay-doppler space division multiplexing for higher order MPSK

    Yutaka Jitsumatsu, Tohru Kohda

    10th European Workshop on Public Key Infrastructures, Services and Applications, EuroPKI 2013  2014.1 

     More details

    Event date: 2013.8

    Language:English  

    Country:United Kingdom  

  • Separability of time-frequency synchronization

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2013 14th International Radar Symposium, IRS 2013  2013.9 

     More details

    Event date: 2013.6

    Language:English  

    Country:Germany  

  • TD/S$^3$受信器の周波数オフセット耐性

    實松 豊, 樋口 巽朗

    電子情報通信学会 非線形問題研究会  2013.5 

     More details

    Event date: 2013.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡市   Country:Japan  

  • Rigorous analysis of quantization error of an A/D converter based on β-map

    2013.9 

     More details

    Event date: 2013.5

    Language:English  

    Venue:Beijing   Country:China  

    A non-binary analog-to-digital converter (ADC) based on β-expansion, called a β-encoder, can reportedly achieve robustness against large process variation and widespread environment change. The quantization error of the β-encoder is not uniformly distributed, which makes mean squared error (MSE) evaluation difficult. In this work, an analysis method for giving the upper bound of the MSE of the quantization error is proposed. We also gave an evaluation of signal-to-noise-ratio (SNR), which is effective for designing β-encoders*.

  • Rigorous analysis of quantization error of an A/D converter based on beta-map International conference

    Proc. 2013 Int. Symp. Circ. and Syst.(ISCAS)  2013.5 

     More details

    Event date: 2013.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  • 非同期CDMA におけるユーザ間干渉の最適化とカオスに基づく拡散符 号

    前田尚哉, 實松豊, 香田徹

    電子情報通信学会非線形問題研究会  2012.11 

     More details

    Event date: 2012.11

    Presentation type:Oral presentation (general)  

    Venue:宮古島   Country:Japan  

  • Frequency synchronisation using SS technique

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2012 9th International Symposium on Wireless Communication Systems, ISWCS 2012  2012.12 

     More details

    Event date: 2012.8

    Language:English  

    Country:France  

  • Frequency synchronisation using SS technique

    YUTAKA JITSUMATSU

    The ninth Int. Sympo. on Wireless Cummunication Systems  2012.8 

     More details

    Event date: 2012.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Welch Bound for Bandlimited and Timelimited Signals International conference

    YUTAKA JITSUMATSU, Tohru Kohda, Kazuyuki Aihara

    SEquences and Their Applications (SETA) 2012  2012.6 

     More details

    Event date: 2012.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • Welch bound for bandlimited and timelimited signals

    Yutaka Jitsumatsu, Tohru Kohda, Kazuyuki Aihara

    7th International Conference on Sequences and Their Applications, SETA 2012  2012.7 

     More details

    Event date: 2012.6

    Language:English  

    Country:Canada  

  • Estimation of frequency, power and phase using modified digital phase locked loop

    M. Saber, Y. Jitsumatsu, M. T.A. Khan

    2012 International Conference on Systems and Informatics, ICSAI 2012  2012.7 

     More details

    Event date: 2012.5

    Language:English  

    Country:China  

  • Estimation of frequency, power and phase using modified digital phase locked loop International conference

    YUTAKA JITSUMATSU, Mohamed Saber, M. T. A. Khan

    2012 International Conference on Systems and Informatics (ICSAI),  2012.5 

     More details

    Event date: 2012.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

    Other Link: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6223346&sortType%3Ddesc_p_Publication_Year%26queryText%3DYutaka+Jitsumatsu

  • 空間ゆらぎのある連想記憶におけるS/N 解析

    前島直斗, 實松豊, 永田賢二, 岡田真人, 香田徹

    34 回情報理論とその応用シンポジウム  2011.11 

     More details

    Event date: 2011.11 - 2011.12

    Presentation type:Oral presentation (general)  

    Venue:岩手   Country:Japan  

  • Markovian SS codes flatten the spectrum of UWB Gaussian pulse

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    2011 IEEE International Conference on Ultra-Wideband, ICUWB 2011  2011.12 

     More details

    Event date: 2011.9

    Language:English  

    Country:Italy  

  • 2D Markovian SS codes flatten time-frequency distribution of signals in asynchronous Gabor division CDMA systems

    Tohru Kohda, Yutaka Jitsumatsu, Kazuyuki Aihara

    36th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011  2011.8 

     More details

    Event date: 2011.5

    Language:English  

    Country:Czech Republic  

  • 時間・周波数のずれを許容するMC-CDMAの性能評価

    鍬崎 辰馬, 香田 徹, 實松 豊

    電子情報通信学会 情報理論研究会  2011.3 

     More details

    Event date: 2011.3

    Presentation type:Oral presentation (general)  

    Venue:大阪   Country:Japan  

  • Frequency division(FD)-based CDMA system International conference

    T. Kohda, Y. Jitsumatsu, and K. Aihara

    The 1st International Symposium on Innovative Mathematical Modeling  2011.3 

     More details

    Event date: 2011.2 - 2011.3

    Country:Japan  

  • 非同期CDMA通信における遅れ時間がユーザ間干渉に与える影響

    前田 尚哉, 實松豊, 香田 徹

    電子情報通信学会 回路とシステム研究会  2011.1 

     More details

    Event date: 2011.1

    Presentation type:Oral presentation (general)  

    Venue:熊本   Country:Japan  

  • 揺らぎのあるニューラルネットワークにおける連想記憶

    前島 直斗, 實松 豊, 香田 徹

    第33回情報理論とその応用シンポジウム  2010.12 

     More details

    Event date: 2010.11 - 2010.12

    Presentation type:Oral presentation (general)  

    Venue:松代   Country:Japan  

  • FD-based CDMAにおけるMAIの分散の評価

    香田 徹, 實松 豊, 藤野 健治郎, 合原 一幸

    第33回情報理論とその応用シンポジウム  2010.12 

     More details

    Event date: 2010.11 - 2010.12

    Presentation type:Oral presentation (general)  

    Venue:松代   Country:Japan  

  • チップ非同期CDMAにおける相互相関の二乗の総和について

    前田 尚哉, 實松 豊, 香田 徹

    第33回情報理論とその応用シンポジウム  2010.12 

     More details

    Event date: 2010.11 - 2010.12

    Venue:松代   Country:Japan  

  • Low noise-low power digital phase-locked loop

    M. Saber, Yutaka Jitsumatsu, M. T.A. Khan

    2010 IEEE Region 10 Conference, TENCON 2010  2010.12 

     More details

    Event date: 2010.11

    Language:English  

    Country:Japan  

  • Low Noise-Low Power Digital Phase-Locked Loop

    M. Saber and Y. Jitsumatsu and M. T. A. Khan

    IEEE Region 10 Conference (TENCON) 2010  2010.11 

     More details

    Event date: 2010.11

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Design and implementation of low power digital phase-locked loop

    M. Saber, Yutaka Jitsumatsu, M. T.A. Khan

    2010 20th International Symposium on Information Theory and Its Applications, ISITA 2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2010  2010.12 

     More details

    Event date: 2010.10

    Language:English  

    Country:Taiwan, Province of China  

  • Design and Implementation of Low Power Digital Phase -Locked Loop International conference

    M. Saber, Y. Jitsumatsu and T. A. Khan

    2010 Int. Sympo. on Spread Spectrum Techniques and Applications (ISSSTA2010)  2010.10 

     More details

    Event date: 2010.10

    Presentation type:Oral presentation (general)  

    Country:Taiwan, Province of China  

  • Frequency division (FD)-based CDMA system which permits frequency offset

    Tohru Kohda, Yutaka Jitsumatsu, Kenjiro Fujino, Kazuyukl Aihara

    2010 20th International Symposium on Information Theory and Its Applications, ISITA2010 and the 2010 20th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA2010  2010.12 

     More details

    Event date: 2010.10

    Language:English  

    Country:Taiwan, Province of China  

  • Is Markov code superior to i.i.d. in communication systems? International conference

    T. Kohda and Y. Jitsumatsu

    2010 Int. Sympo. on Nonlinear Theory and its Applications  2010.9 

     More details

    Event date: 2010.9

    Presentation type:Oral presentation (general)  

    Country:Poland  

  • 揺らぎのあるニューラルネットワークにおける連想記憶

    香田 徹, 實松 豊, 前島 直斗

    電子情報通信学会 情報理論研究会,  2010.5 

     More details

    Event date: 2010.5

    Presentation type:Oral presentation (general)  

    Venue:徳島   Country:Japan  

  • 受信機の設定値揺らぎに高耐性のフィルタについて

    實松豊

    情報とダイナミクスIII研究集会  2009.10 

     More details

    Event date: 2009.10 - 2010.5

    Presentation type:Oral presentation (general)  

    Venue:福岡   Country:Japan  

  • A low-power implementation of arctangent function for communication applications using FPGA

    M. Saber, Yutaka Jitsumatsu, T. Kohda

    4th International Workshop on Signal Design and Its Applications in Communications, IWSDA'09  2009.12 

     More details

    Event date: 2009.10

    Language:English  

    Country:Japan  

  • A low-power implementation of arctangent function for communication applications using FPGA International conference

    M. Saber and Y. Jitsumatsu and T. Kohda

    4th Int. Workshop on Signal Design and Its Applications in Communications (IWSDA'09)  2009.10 

     More details

    Event date: 2009.10

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • マルコフ符号で拡散変調されたガウスフィルタ特性とそのフィルタバンク特性

    香田 徹, 實松 豊, 鍬崎 辰馬, 藤野 健治郎

    電子情報通信学会情報理論研究会  2009.3 

     More details

    Event date: 2009.3

    Presentation type:Oral presentation (general)  

    Venue:函館   Country:Japan  

    Other Link: http://www.ieice.org/ken/paper/20090309va8A/

  • Quasi-orthogonal multi-carrier CDMA

    Yutaka Jitsumatsu, Tohru Kohda

    2008 IEEE Global Telecommunications Conference, GLOBECOM 2008  2008.12 

     More details

    Event date: 2008.11 - 2008.12

    Language:English  

    Country:United States  

  • Markov codes compensate ISI of Gaussian pulse

    Yutaka Jitsumatsu and Tohru Kohda

    2008.11 

     More details

    Event date: 2008.11

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Spreading sequences for CDMA channels with ISI

    Yutaka Jitsumatsu and Tohru Kohda

    Symposium on Information Theory and its Applications (SITA2008)  2008.10 

     More details

    Event date: 2008.10

    Country:Japan  

  • A comparison between prolate spheroidar and Gaussian FIR pulse shaping filters

    Yutaka Jitsumatsu, Masato Ogatas, Tohru Kohda

    ICSES 2008 International Conference on Signals and Electronic Systems, ICSES'08  2008.12 

     More details

    Event date: 2008.9

    Language:English  

    Country:Poland  

  • A comparison betwwwn prolate spheroidal and Gaussian FIR pulse shaping filters International conference

    Yutaka Jitsumatsu, Masato Ogata and Tohru Kohda

    International Conference on Signals and Eletronic Systems  2008.9 

     More details

    Event date: 2008.9

    Presentation type:Oral presentation (general)  

    Country:Poland  

  • An MC-UWB System with Overlapping Gaussian Subcarriers International conference

    Yutaka Jitsumatsu and Tohru Kohda

    2008 Int. Sympo. on Nonlinear Theory and its Applications  2008.9 

     More details

    Event date: 2008.9

    Presentation type:Oral presentation (general)  

    Country:Hungary  

  • Markov codes make gaussian pulse superior to a raised cosine pulse

    Yutaka Jitsumatsu, Tohru Kohda

    2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA2008  2008.12 

     More details

    Event date: 2008.8

    Language:English  

    Country:Italy  

  • Prolate spheroidal wave functions induce Gaussian chip waveforms

    Yutaka Jitsumatsu, Tohru Kohda

    2008 IEEE International Symposium on Information Theory, ISIT 2008  2008.9 

     More details

    Event date: 2008.7

    Language:English  

    Country:Canada  

  • Welch bound for FIR lowpass filtered sequences

    Yutaka Jitsumatsu, Tohru Kohda

    2007 IEEE International Symposium on Information Theory, ISIT 2007  2007.12 

     More details

    Event date: 2007.6

    Language:English  

    Country:France  

  • Gaussian chip waveform together with markovian spreading codes improve BER performance in chip-asynchronous CDMA systems

    Yutaka Jitsumatsu, M. Tahir Abbas Khan, Tohru Kohda

    IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference  2006.12 

     More details

    Event date: 2006.11 - 2006.12

    Language:English  

    Country:United States  

  • Chip-asynchronous version of welch bound Gaussian pulse improves BER performance

    Yutaka Jitsumatsu, Tohru Kohda

    4th International Conference on Sequences and Their Applications, SETA 2006  2006.1 

     More details

    Event date: 2006.9

    Language:English  

    Country:China  

  • A lower bound on the mean squared correlations for band-limited asynchronous DS/CDMA systems

    Yutaka Jitsumatsu, Tohru Kohda

    2006 IEEE International Symposium on Information Theory, ISIT 2006  2006.12 

     More details

    Event date: 2006.7

    Language:English  

    Country:United States  

  • Gaussian chip shaping enhances the superiority of Markovian codes in DS/CDMA systems

    Yutaka Jitsumatsu, Tohru Kohda

    ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems  2006.12 

     More details

    Event date: 2006.5

    Language:English  

    Country:Greece  

  • Maximum a posteriori probability (MAP) code acquisition in multiuser DS/CDMA systems

    Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda

    2005 Asia-Pacific Conference on Communications  2005.12 

     More details

    Event date: 2005.10

    Language:English  

    Country:Australia  

  • A novel code acquisition algorithm and its application to markov spreading codes

    Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda

    IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005  2005.12 

     More details

    Event date: 2005.5

    Language:English  

    Country:Japan  

  • Design of code-matched receiver for DS/CDMA communications

    Yutaka Jitsumatsu, Tohru Kohda

    IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005  2005.12 

     More details

    Event date: 2005.5

    Language:English  

    Country:Japan  

  • Bit error rates of information and watermark bits in digital watermarking systems based on SS techniques

    Yutaka Jitsumatsu, Yosuke Hattori, Tahir Abbas Khan, Tohru Kohda

    2004 IEEE International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2004  2004 

     More details

    Event date: 2004.8 - 2004.9

    Language:English  

    Country:Australia  

  • Multiuser code acquisition in DSKDMA systems

    Tahir Ahbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda

    IEEE Topical Conference on Wireless Communication Technology  2003.1 

     More details

    Event date: 2003.10

    Language:English  

    Country:United States  

  • Code acquisition on Markovian SS codes in a chip-synchronous DS/CDMA system

    Yutaka Jitsumatsu, Nobuoki Eshima, Tohru Kohda

    Proceedings 2003 IEEE International Symposium on Information Theory (ISIT)  2003.10 

     More details

    Event date: 2003.6 - 2003.7

    Language:English  

    Country:Japan  

  • Spread-spectrum Markovian-code acquisition in asynchronous DS/CDMA systems

    Tohru Kohda, Yutaka Jitsumatsu, Tahir Abbas Khan

    Proceedings of the 2003 IEEE International Symposium on Circuits and Systems  2003.7 

     More details

    Event date: 2003.5

    Language:English  

    Country:Thailand  

  • 非同期CDMA通信から導かれる連想記憶の結合重み

    井上 翔太,實松 豊,香田 徹,

    第28回情報理論とその応用学会(SITA2005)  2005.12 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Variance of Average Interference Parameters for LFSR and Random Markov Codes

    Yutaka Jitsumatsu, M.Tahir Abbas Khan, and Tohru Kohda,

    the 28th Sympo. on Information Theory and Its Applications (SITA2005)  2005.12 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Associative Memories with Asynchronously Overlapping Connections Learn Markov Pattern Better than I.I.D

    Yutaka Jitsumatsu, , and Tohru Kohda,

    Proc. of the 28th Sympo. on Information Theory and Its Applications (SITA2005)  2005.12 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Cross Correlation Matrices for Multiuser Chip-Asynchronous DS/CDMA systems

    Yutaka Jitsumatsu, M. Tahir Abbas khan, Tohru Kohda,

    IEICE Tech. Report,  2006.3 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Gaussian Chip Shaping Enhances the Superiority of Markovian Codes in DS/CDMA Systems International conference

    Yutaka Jitsumatsu and Tohru Kohda

    2006 IEEE Int. Symp. on Circuits and Systems  2006.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Greece  

  • Introducing ISI Can Lead to Reduction in BER of Chip-Asynchronous DS/CDMA Systems International conference

    Y. Jitsumatsu, M. T. A. Khan, T. Kohda,

    the 9th Int. Symp. on Wireless Personal Multimedia Communications  2006.11 

     More details

    Presentation type:Oral presentation (general)  

    Country:United States  

  • マルチユーザ受信器のビット反転によるエネルギー関数減少法

    羽根竜一, 實松 豊, 香田 徹

    電子情報通信学会 技術研究報告 情報理論  2007.3 

     More details

    Presentation type:Oral presentation (general)  

    Venue:群馬大学(桐生市)   Country:Japan  

  • Slepian’s prolate spheroidal wave functions revisited

    第30回 情報理論とその応用シンポジウム  2007.11 

     More details

    Presentation type:Oral presentation (general)  

    Venue:三重県 賢島   Country:Japan  

  • Maximum a posteriori Probability (MAP) Code Acquisition in Multiuser DS/CDMA Systems International conference

    T. A. Khan, N. Eshima, Y. Jitsumatsu, T. Kohda,

    2005 Asia-Pacific Conference on Communications  2005.10 

     More details

    Presentation type:Oral presentation (general)  

    Country:Australia  

  • 多元通信における同期確立の難易度について

    實松豊、 香田徹

    数理解析研究所講究録1240, 短期共同研究「確率数値解析に於ける諸問題, V」  2001.12 

     More details

    Presentation type:Oral presentation (general)  

    Venue:京都大学   Country:Japan  

  • マルコフ連鎖に基づくスペクトル拡散符号の自己相関関数について

    實松豊 香田徹

    第24回情報理論とその応用シンポジウム予稿集  2001.12 

     More details

    Presentation type:Oral presentation (general)  

    Venue:神戸   Country:Japan  

  • Self-Interferences of SS Codes Generated by a Markov Chain International conference

    Y. Jitsumatsu and T. Kohda

    IEEE Int. Symp. on Information Theory,  2002.7 

     More details

    Presentation type:Oral presentation (general)  

    Country:Switzerland  

  • Bit Error Rate in an Asynchronous DS/CDMA System Using Markovian SS Codes International conference

    Tohru kohda, Yoshinobu Matsumura and Yutaka Jitsumatsu

    IEEE 7th Int. Symp. on Spread-Spectrum Tech. \& Appl.,  2002.9 

     More details

    Presentation type:Oral presentation (general)  

    Country:Czech Republic  

  • Spread-Spectrum Markovian-Code Acquisition in Asynchronous DS/CDMA Systems International conference

    T. Kohda, Y. Jitsumatsu and T.A.Khan

    2003 IEEE Int. Sympo. on Circ. and Syst.  2003.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Thailand  

  • Code Acquisition of Markovian SS Codes in a Chip-Synchronous DS/CDMA System International conference

    Y. Jitsumatsu, N. Eshima and T. Kohda

    2003 IEEE International Symposium on Information Theory  2003.7 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • チップ同期DS/CDMAシステムにおけるマルコフSS符号の同期捕捉

    實松 豊, 江島 伸興, 香田 徹

    電子情報通信学会技術研究報告,情報理論研究会  2003.9 

     More details

    Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  • スペクトル拡散方式を利用した画像伝送時の電子透かしシステムにおける透かしビットのビット誤り率," Proc. of pp.1197-1201, 2004.

    服部 洋輔,實松 豊,香田 徹,

    2004.1 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • An a posteriori Probability Threshold Rule for Multiuser Code Acquisition in DS/CDMA Systems: Theoretical and Approximate Methods International conference

    Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu and Tohru Kohda

    Vehicular Technology Conference 2004 Spring  2004.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Italy  

  • Markovian SS codes imply inversion-free code acquisition in asynchronous DS/CDMA systems International conference

    Nobuoki Eshima, Yutaka Jitsumatsu and Tohru Kohda

    2004 International Symposium on Circuits and Systems  2004.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Canada  

  • Bit Error Rates of Information and Watermark Bits in Digital Watermarking Systems Based on SS Techniques International conference

    Y. Jitsumatsu, Y. Hattori, T. A. Khan and T. Kohda,

    2004 IEEE International Symposium on Spread Spectrum and its applications,  2004.8 

     More details

    Presentation type:Oral presentation (general)  

    Country:Australia  

  • Correlation Reduces Bit Error Rate of LFSR Codes up to Optimum International conference

    Y. Jitsumatsu and T. Kohda

    Sequences and Their Applications (SETA) 2004  2004.10 

     More details

    Country:Korea, Republic of  

  • Digital Watermarking Based on Spread Spectrum Technique

    Yutaka Jitsumatsu, Laurent Hordoir, and Tohru Kohda,

    the 2005 Sympo. on Cryptography and Information Security (SCIS2005)  2005.1 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Digital Watermarking Based on Spread Spectrum Technique

    Yutaka Jitsumatsu and Laurent Hordoir and Tohru Kohda

    Proc. of the 2005 Symposium on Cryptography and Information Sequrity  2005.1 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Design of Code-Matched Receiver for DS/CDMA Communications International conference

    Yutaka Jitsumatsu and Tohru Kohda

    Proc. of 2005 IEEE Int. Symp. on Circuits and Systems  2005.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • A Novel Code Acquisition Algorithm and its Application to Markov Spreading Codes International conference

    Tahir Abbas Khan and Yutaka Jitsumatsu and Tohru Kohda

    Proc. of IEEE Int. Symp. on Circuits and Systems  2005.5 

     More details

    Presentation type:Oral presentation (general)  

    Country:Japan  

  • Gabor分割スペクトル拡散方式によるパルスレーダにおける遅延・ドップラー推定の高精細化

    電子情報通信学会

     More details

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

    Other Link: https://ken.ieice.org/ken/paper/20240119pCZJ/eng/

▼display all

MISC

  • Computation of the optimal error exponent function for fixed-length lossy source coding in discrete memoryless sources

    Yutaka Jitsumatsu

    2023.12

     More details

    The error exponent of fixed-length lossy source coding was established by
    Marton. Ahlswede showed that this exponent can be discontinuous at a rate $R$,
    depending on the source distribution $P$ and the distortion measure $d(x,y)$.
    The reason for the discontinuity in the error exponent is that there exists a
    distortion measure $d(x,y)$ and a distortion level $\Delta$ such that the
    rate-distortion function $R(\Delta|P)$ is neither concave nor quasi-concave
    with respect to $P$. Arimoto's algorithm for computing the error exponent in
    lossy source coding is based on Blahut's parametric representation of the error
    exponent. However, Blahut's parametric representation is a lower convex
    envelope of Marton's exponent, and the two do not generally agree. A major
    contribution of this paper is to provide a parametric representation that
    perfectly matches the inverse function of Marton's exponent, thereby preventing
    the problems arising from the above-mentioned non-concavity of $R(\Delta|P)$.
    For fixed parameters, an optimal distribution can be obtained using Arimoto's
    algorithm. By performing a nonconvex optimization over the parameters, the
    inverse function of Marton's exponent is obtained.

    arXiv

    researchmap

    Other Link: http://arxiv.org/pdf/2312.03784v1

  • Computation of the optimal error exponent function for fixed-length lossy source coding in discrete memoryless sources

    Yutaka Jitsumatsu

    2023.12

     More details

    Language:Others  

  • IEEE International Symposium on Information Theory—(ISIT2023, https://www.isit2023.org) Taipei International Convention Center (TICC), Taipei, Taiwan 2023年6月25日~30日

    實松 豊

    電子情報通信学会 基礎・境界ソサイエティ Fundamentals Review   17 ( 2 )   165 - 166   2023.10   eISSN:1882-0875

     More details

    Language:Japanese   Publisher:一般社団法人 電子情報通信学会  

    DOI: 10.1587/essfr.17.2_165

    CiNii Research

    researchmap

  • Computing the optimal error exponential function for fixed-length lossy coding in discrete memoryless sources

    Yutaka Jitsumatsu

    CoRR   abs/2304.11558   2023.4

     More details

    Language:Others  

    The error exponent of fixed-length lossy source coding was established by
    Marton. Ahlswede showed that this exponent can be discontinuous at a rate $R$,
    depending on the probability distribution $P$ of the given information source
    and the distortion measure $d(x,y)$. The reason for the discontinuity in the
    error exponent is that there exists $(d,\Delta)$ such that the rate-distortion
    function $R(\Delta|P)$ is neither concave nor quasi-concave with respect to
    $P$. Arimoto's algorithm for computing the error exponent in lossy source
    coding is based on Blahut's parametric representation of the error exponent.
    However, Blahut's parametric representation is a lower convex envelope of
    Marton's exponent, and the two do not generally agree. The contribution of this
    paper is to provide a parametric representation that perfectly matches with the
    inverse function of Marton's exponent, thus avoiding the problem of the
    rate-distortion function being non-convex with respect to $P$. The optimal
    distribution for fixed parameters can be obtained using Arimoto's algorithm.
    Performing a nonconvex optimization over the parameters successfully yields the
    inverse function of Marton's exponent.

    DOI: 10.48550/arXiv.2304.11558

    arXiv

    researchmap

    Other Link: http://arxiv.org/pdf/2304.11558v1

  • 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—Shared Dataset Initiative toward Applications of Machine Learning and Mathematical Optimization for Wireless Communications

    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 = The journal of the Institute of Electronics, Information and Communication Engineers   2022.6

     More details

    Language:Japanese  

  • 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—Shared Dataset Initiative toward Applications of Machine Learning and Mathematical Optimization for Wireless Communications

    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 = The journal of the Institute of Electronics, Information and Communication Engineers   105 ( 6 )   509 - 515   2022.6   ISSN:0913-5693

     More details

  • Discrete Prolate Spheroidal Sequencesを用いた位相変調パルスレーダのための系列設計—A sequence design for a Phase-Coded Pulse radar using Discrete Prolate Spheroidal Sequences—情報センシングメディア工学

    實松 豊

    映像情報メディア学会技術報告 = ITE technical report   2022.5

     More details

    Language:Japanese  

  • Discrete Prolate Spheroidal Sequencesを用いた位相変調パルスレーダのための系列設計—A sequence design for a Phase-Coded Pulse radar using Discrete Prolate Spheroidal Sequences—情報センシングメディア工学

    實松 豊

    映像情報メディア学会技術報告 = ITE technical report   46 ( 15 )   7 - 12   2022.5   ISSN:1342-6893

     More details

    Language:Japanese   Publisher:東京 : 映像情報メディア学会  

    CiNii Books

    CiNii Research

    researchmap

  • Novel Wireless Communication System Realized by Mobile Terminal Collaboration-Recent Results and Application to Uplink Transmission-

    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

    電子情報通信学会技術研究報告(Web)   122 ( 235(RCS2022 128-154) )   2022   ISSN:2432-6380

  • 畳込みニューラルネットワークによる岩石の弾性波速度推定 (情報センシング メディア工学)

    釜野 太郎, 實松 豊, 辻 健

    映像情報メディア学会技術報告 = ITE technical report   2020.5

     More details

    Language:Japanese  

  • 大規模マシンタイプ通信におけるスパース重ね合わせ符号 (回路とシステム)

    立和名 隼人, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2020.2

     More details

    Language:Japanese  

  • Cooperative Jammingにおける妨害者の計画的設置の検討 (回路とシステム)

    渡邉 一輝, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2020.2

     More details

    Language:Japanese  

  • 二元対称消失通信路における条件付情報漏洩量の分布 (情報理論)

    道脇 右京, 實松 豊, 大濱 靖匡

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2019.3

     More details

    Language:Japanese  

  • 超解像の応用によるMRIの高速化に関する検討 (情報理論)

    中島 綾香, 川喜田 雅則, 實松 豊, 久原 重英, 竹内 純一

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2017.3

     More details

    Language:Japanese  

  • β進/2進変換に基づく乱数生成アルゴリズムの性能評価 (情報理論)

    小田 晃平, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2017.1

     More details

    Language:Japanese  

  • Atomic Normを用いた線スペクトル推定法の性能評価 (情報理論)

    西部 洋介, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2017.1

     More details

    Language:Japanese  

  • A-8-21 連続値パラメータ推定における圧縮センシングの手法の性能比較(A-8.信号処理,一般セッション)

    西部 洋介, 古賀 郁海, 實松 豊

    電子情報通信学会基礎・境界ソサイエティ/NOLTAソサイエティ大会講演論文集   2016.3

     More details

    Language:Japanese  

  • A-8-20 圧縮センシングに基づく通信路推定法におけるパラメータの離散化問題(A-8.信号処理,一般セッション)

    梁 同信, 實松 豊

    電子情報通信学会基礎・境界ソサイエティ/NOLTAソサイエティ大会講演論文集   2016.3

     More details

    Language:Japanese  

  • An Iterative Algorithm for Computing the Optimal Exponent of Correct Decoding Probability for Rates below the Rate Distortion Function

    Yutaka Jitsumatsu, Yasutada Oohama

    2016.1

     More details

    Language:Others  

    An Iterative Algorithm for Computing the Optimal Exponent of Correct Decoding Probability for Rates below the Rate Distortion Function
    The form of Dueck and K"orner&#039;s exponent function for correct decoding<br />
    probability for discrete memoryless channels at rates above the capacity is<br />
    similar to the form of Csisz&#039;ar and K"orner&#039;s exponent function for correct<br />
    decoding probability in lossy source coding for discrete memoryless sources at<br />
    rates below the rate distortion function. We recently gave a new algorithm for<br />
    computing Dueck and K"orner&#039;s exponent. In this paper, we give an algorithm<br />
    for computing Csisz&#039;ar and K"orner&#039;s exponent. The proposed algorithm can be<br />
    also used to compute cutoff rate and the rate distortion function.

  • 実数βを基数とするA/D変換器におけるβの推定値の更新法 (情報理論)

    小田 晃平, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2015.7

     More details

    Language:Japanese  

  • 招待講演 β変換器の量子化誤差に関する理論的解析 (非線形問題)

    牧野 貴樹, 岩田 友紀子, 實松 豊, 堀田 正生, 傘 昊, 合原 一幸

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.9

     More details

    Language:Japanese  

    非線形写像であるβ写像で構成される非二進A/D変換器であるβ変換器は、プロセス変動や広範囲な環境変化に対するロバスト性を有するとされているが、量子化誤差が非一様に分布しているため、平均二乗誤差を評価することが困難であった。本講演では、β変換器の基礎的性質について論じるとともに、量子化誤差の平均二乗誤差の上限を計算するための新たな解析法の研究について述べる。また、その解析に基づき、β変換器に基づく設計に重要となる、S/N比の評価を与える。

  • 招待講演 β変換器の量子化誤差に関する理論的解析 (非線形問題)

    牧野 貴樹, 岩田 友紀子, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.9

     More details

    Language:Japanese  

  • 招待講演 β変換器の量子化誤差に関する理論的解析 (回路とシステム)

    牧野 貴樹, 岩田 友紀子, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.9

     More details

    Language:Japanese  

  • 招待講演 β変換器の量子化誤差に関する理論的解析 (回路とシステム)

    牧野 貴樹, 岩田 友紀子, 實松 豊, 堀田 正生, 傘 昊, 合原 一幸

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.9

     More details

    Language:Japanese  

    非線形写像であるβ写像で構成される非二進A/D変換器であるβ変換器は、プロセス変動や広範囲な環境変化に対するロバスト性を有するとされているが、量子化誤差が非一様に分布しているため、平均二乗誤差を評価することが困難であった。本講演では、β変換器の基礎的性質について論じるとともに、量子化誤差の平均二乗誤差の上限を計算するための新たな解析法の研究について述べる。また、その解析に基づき、β変換器に基づく設計に重要となる、S/N比の評価を与える。

  • 通信における時間同期と周波数同期の分離可能条件 (短距離無線通信)

    實松 豊, 香田 徹, 合原 一幸

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.8

     More details

    Language:Japanese  

    無線通信においては,情報信号の送信に先だって時間および周波数の同期を確立する必要がある.また,遅延時間とドップラー周波数の推定は,レーダ問題の基本である.著者らは最近,大幅なドップラー周波数推移が存在する環境下で,伝搬遅延とドップラー周波数を検出する方法を提案した.提案法は,テンプレート波形という概念を用いて,遅延と周波数推移の2次元の未知パラメータの探索問題を2つの独立した1次元探索問題に分離する.我々は, International Radar Symposium 2013において,遅延と周波数推移が分離可能となるためのSeparable Property (SP)条件を与えた.本稿では, Gabor Division/Spread Spectrum System (GD/S^3)がSP条件を満たすことを示す.

  • 通信における時間同期と周波数同期の分離可能条件 (短距離無線通信)

    實松 豊, 香田 徹, 合原 一幸

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.8

     More details

    Language:Japanese  

  • TD/S³受信器の周波数オフセット耐性 (非線形問題)

    樋口 巽朗, 實松 豊

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   2013.5

     More details

    Language:Japanese  

    従来の時間領域拡散符号によるdirect sequence/spread spectrum(DS/SS)では,相関受信器を用いて符号同期を確立することによりチップ時間単位での遅れ時間の推定ができる.一方,最近提案されたtime division/spreadspectrum system(TD/S^3)では,受信信号のフーリエ変換と周波数領域テンプレートとのパターンマッチングを行う周波数領域相関器によりドップラー周波数の検出ができる.本稿では,周波数領域相関器の周波数同期オフセットに対する耐性を調査する.

  • TD/S3受信器の周波数オフセット耐性

    樋口巽朗, 實松豊

    電子情報通信学会技術研究報告   2013.5

     More details

    Language:Japanese  

  • 非同期CDMAにおけるユーザ間干渉の最適化とカオスに基づく拡散符号

    前田 尚哉, 實松 豊, 香田 徹

    電子情報通信学会技術研究報告. NLP, 非線形問題   2011.11

     More details

    Language:Japanese  

    カオスを用いて発生させた擬似乱数の応用の一つにスペクトル拡散通信がある.香田と藤崎は,マルコフ写像から発生される負の自己相関を持つカオス符号を用いると,独立同分布(i.i.d.)に従う擬似乱数や従来のシフトレジスタ系列よりもビット誤り率を低下させることを示した.しかしこの事実は,通信分野で広く認識されていない.広く受け入れられている拡散符号の設計指標は,相互相関の二乗の総和値に関するWelchの下界である.本稿では,チップ非同期CDMAとチップ同期CDMAの違いについて述べ,前者の場合はカオス符号が相互相関の二乗の総和の点でも優れることを示す.

  • 空間ゆらぎのある連想記憶におけるS/N解析

    前島直斗, 實松豊, 永田賢二, 岡田真人, 香田徹

    情報理論とその応用シンポジウム予稿集(CD-ROM)   2011.11

     More details

    Language:Japanese  

  • Asynchrony, Markov, interference (力学系--理論から応用へ、応用から理論へ--RIMS研究集会報告集)

    實松 豊, 香田 徹

    数理解析研究所講究録   2011.5

     More details

    Language:English  

  • 時間・周波数のずれを許容するMC-CDMAの性能評価

    鍬崎 辰馬, 香田 徹, 實松 豊

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   2011.2

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は,時間軸・周波数軸に加えて符号という第3の軸を導入したことにより,ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし,LTE(long term evolution)と呼ばれる第3.9世代携帯電話では,下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用された.直交キャリア方式は,周波数軸上で信号がオーバーラップしているため,ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには,伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では,Gaborの時間・周波数の2次元表現に立ち返り,ガウス波形を用いた,時間・周波数のずれを許容するマルチキャリア(Multi Carrier;MC)CDMAシステムを提案し,ビット誤り率(Bit Error Rate;BER)と信号対干渉比(Signalto Interference Ratio;SIR)を評価する.

  • 時間・周波数のずれを許容するMC-CDMAの性能評価

    鍬崎 辰馬, 香田 徹, 實松 豊

    電子情報通信学会技術研究報告. WBS, ワイドバンドシステム : IEICE technical report   2011.2

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は,時間軸・周波数軸に加えて符号という第3の軸を導入したことにより,ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし,LTE(long term evolution)と呼ばれる第3.9世代携帯電話では,下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用された.直交キャリア方式は,周波数軸上で信号がオーバーラップしているため,ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには,伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では,Gaborの時間・周波数の2次元表現に立ち返り,ガウス波形を用いた,時間・周波数のずれを許容するマルチキャリア(Multi Carrier;MC)CDMAシステムを提案し,ビット誤り率(Bit Error Rate;BER)と信号対干渉比(Signalto Interference Ratio;SIR)を評価する.

  • 時間・周波数のずれを許容するMC-CDMAの性能評価

    鍬崎 辰馬, 香田 徹, 實松 豊

    電子情報通信学会技術研究報告. IT, 情報理論   2011.2

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は,時間軸・周波数軸に加えて符号という第3の軸を導入したことにより,ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし,LTE(long term evolution)と呼ばれる第3.9世代携帯電話では,下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用された.直交キャリア方式は,周波数軸上で信号がオーバーラップしているため,ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには,伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では,Gaborの時間・周波数の2次元表現に立ち返り,ガウス波形を用いた,時間・周波数のずれを許容するマルチキャリア(Multi Carrier;MC)CDMAシステムを提案し,ビット誤り率(Bit Error Rate;BER)と信号対干渉比(Signalto Interference Ratio;SIR)を評価する.

  • 非同期CDMA通信における遅れ時間がユーザ間干渉に与える影響

    前田 尚哉, 實松 豊, 香田 徹

    電子情報通信学会技術研究報告. CAS, 回路とシステム   2011.1

     More details

    Language:Japanese  

    CDMAは同期の種類によって完全同期,チップ同期,チップ非同期の3種類のシステムに分類できる。CDMAシステムの性能は相互相関の二乗の総和で評価することができ、同期の種類に応じてそれぞれtotal sauared correlation (TSC), total sauared asynchronous correlation (TSAC), asynchronous total sauared correlation (ATSC)と呼ばれている。TSCとTSACについては最小値が明らかになっている。しかしながら、ATSCについてはHombsとLehnertが遅れ時間の小数部分とチップ波形に依存することを示したものの、厳密な最小値はまだ明らかではない。本論文では、チップ同期とチップ非同期の場合を区別せずに相互相関の二乗の総和をTSACと呼ぶこととする。チップ波形がsinc波形の場合のTSACに対し、一つの下界を与える。

  • 揺らぎのあるニューラルネットワークにおける連想記憶

    前島直斗, 實松豊, 香田徹

    情報理論とその応用シンポジウム予稿集(CD-ROM)   2010.11

     More details

    Language:Japanese  

  • FD‐based CDMAにおけるMAIの分散の評価

    香田徹, 實松豊, 藤野健治郎, 合原一幸

    情報理論とその応用シンポジウム予稿集(CD-ROM)   2010.11

     More details

    Language:Japanese  

  • チップ非同期CDMAにおける相互相関の二乗の総和について

    前田尚哉, 實松豊, 香田徹

    情報理論とその応用シンポジウム予稿集(CD-ROM)   2010.11

     More details

    Language:Japanese  

  • 揺らぎのあるニューラルネットワークにおける連想記憶

    香田 徹, 實松 豊, 前島 直斗

    電子情報通信学会技術研究報告. IT, 情報理論   2010.5

     More details

    Language:Japanese  

    ニューラルネットワークの応用の一つに連想記憶がある.連想記憶とは,情報をパタンとして分散的に表現した上で貯蔵し,部分的な情報を手がかりとして必要な情報を読み出す方式のことである.また,連想記憶は,並列・分散型記憶装置が実現できる,一部分が壊れても全体にはほとんど影響がないなど,工学的な意義ももつ.本稿では,連想記憶のモデルがCDMA通信のモデルと類似している点に着目し,CDMA通信においてユーザ数増大に有効であった非同期性の導入と,マルコフ連鎖による擬似乱数の生成という手法が,連想記憶においても有効であるか検証を行う.

  • マルコフ符号で拡散変調されたガウスフィルタ特性とそのフィルタバンク特性

    香田 徹, 實松 豊, 鍬崎 辰馬, 藤野 健治郎

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   2009.3

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は、時間軸・周波数軸に加えて符号という第3の軸を導入したことにより、ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし、LTE(long term evolution)と呼ばれる第3.9世代携帯電話では、下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用される見通しである.直交キャリア方式は、周波数軸上で信号がオーバーラップしているため、ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには、伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では、Gaborの時間・周波数の2次元表現に立ち返り、ガウス波形を用いたマルチキャリアCDMAシステムを提案し、キャリア間干渉とビット誤り率を評価する.ガウス波形は直交しないので、周波数のずれが全く無い場合でもキャリア間干渉が存在するが、周波数のずれに対するキャリア間干渉の増加率は矩形波に比べ非常に小さい.

  • マルコフ符号で拡散変調されたガウスフィルタ特性とそのフィルタバンク特性

    香田 徹, 實松 豊, 鍬崎 辰馬, 藤野 健治郎

    電子情報通信学会技術研究報告. WBS, ワイドバンドシステム : IEICE technical report   2009.3

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は、時間軸・周波数軸に加えて符号という第3の軸を導入したことにより、ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし、LTE(long term evolution)と呼ばれる第3.9世代携帯電話では、下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用される見通しである.直交キャリア方式は、周波数軸上で信号がオーバーラップしているため、ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには、伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では、Gaborの時間・周波数の2次元表現に立ち返り、ガウス波形を用いたマルチキャリアCDMAシステムを提案し、キャリア間干渉とビット誤り率を評価する.ガウス波形は直交しないので、周波数のずれが全く無い場合でもキャリア間干渉が存在するが、周波数のずれに対するキャリア間干渉の増加率は矩形波に比べ非常に小さい.

  • マルコフ符号で拡散変調されたガウスフィルタ特性とそのフィルタバンク特性

    香田 徹, 實松 豊, 鍬崎 辰馬, 藤野 健治郎

    電子情報通信学会技術研究報告. IT, 情報理論   2009.3

     More details

    Language:Japanese  

    符号分割多元接続(CDMA)通信は、時間軸・周波数軸に加えて符号という第3の軸を導入したことにより、ユーザ間干渉を許容する柔軟なシステム設計を可能にした.しかし、LTE(long term evolution)と呼ばれる第3.9世代携帯電話では、下り回線にこれまでのCDMAに代わって直交周波数分割多元接続(OFDMA)が採用される見通しである.直交キャリア方式は、周波数軸上で信号がオーバーラップしているため、ドップラー効果などで周波数のずれがおこるとキャリア間干渉が急激に増加する.通信システムには、伝送効率だけでなく,周波数・時間の同期の不可避なずれに対する頑強性も求められる.本稿では、Gaborの時間・周波数の2次元表現に立ち返り、ガウス波形を用いたマルチキャリアCDMAシステムを提案し、キャリア間干渉とビット誤り率を評価する.ガウス波形は直交しないので、周波数のずれが全く無い場合でもキャリア間干渉が存在するが、周波数のずれに対するキャリア間干渉の増加率は矩形波に比べ非常に小さい.

  • Spreading sequences for CDMA channels with ISI.

    JITSUMATSU Yutaka, KOHDA Tohru

    2008.9

     More details

    Language:English  

    Spreading sequences for CDMA channels with ISI.

  • Slepian's prolate spheroidal wave functions revisited.

    JITSUMATSU Yutaka, KOHDA Tohru

    2007.11

     More details

    Language:English  

    Slepian's prolate spheroidal wave functions revisited.

  • マルチユーザ受信器のビット反転によるエネルギー関数減少法

    羽根 竜一, 實松 豊, 香田 徹

    電子情報通信学会技術研究報告. WBS, ワイドバンドシステム : IEICE technical report   2007.3

     More details

    Language:Japanese  

    CDMA通信におけるDecorrelator受信器やMMSE受信器は,相関行列の逆行列をかけた後,硬判定を行うので誤り率には改善の余地がある.一方,事後確率計算による最適受信器は,演算回数がユーザ数の指数オーダであり現実的でない.本稿では,従来の受信器で得られた推定値を初期値とする近傍探索に有効なエネルギー関数を導入することでビット誤り率が改善できること示した.この受信器は,少ない演算回数でDecorrelatorやMMSEよりも低い誤り率を達成する.

  • マルチユーザ受信器のビット反転によるエネルギー関数減少法

    羽根 竜一, 實松 豊, 香田 徹

    電子情報通信学会技術研究報告. IT, 情報理論   2007.3

     More details

    Language:Japanese  

    CDMA通信におけるDecorrelator受信器やMMSE受信器は,相関行列の逆行列をかけた後,硬判定を行うので誤り率には改善の余地がある.一方,事後確率計算による最適受信器は,演算回数がユーザ数の指数オーダであり現実的でない.本稿では,従来の受信器で得られた推定値を初期値とする近傍探索に有効なエネルギー関数を導入することでビット誤り率が改善できること示した.この受信器は,少ない演算回数でDecorrelatorやMMSEよりも低い誤り率を達成する.

  • マルチユーザ受信器のビット反転によるエネルギー関数減少法

    羽根 竜一, 實松 豊, 香田 徹

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   2007.3

     More details

    Language:Japanese  

    CDMA通信におけるDecorrelator受信器やMMSE受信器は,相関行列の逆行列をかけた後,硬判定を行うので誤り率には改善の余地がある.一方,事後確率計算による最適受信器は,演算回数がユーザ数の指数オーダであり現実的でない.本稿では,従来の受信器で得られた推定値を初期値とする近傍探索に有効なエネルギー関数を導入することでビット誤り率が改善できること示した.この受信器は,少ない演算回数でDecorrelatorやMMSEよりも低い誤り率を達成する.

  • Cross Correlation Matrices for Multiuser Chip-Asynchronous DS/CDMA Systems

    JITSUMATSU Yutaka, TAHIR ABBAS KHAN M, KOHDA Tohru

    2006.3

     More details

    Language:English  

    Cross Correlation Matrices for Multiuser Chip-Asynchronous DS/CDMA Systems
    It is shown that asynchronous direct sequence/code division multiple access (DS/CDMA) systems are analogous to associative memories with asynchronously overlapping connections. Strategies to design the connection weight matrices of associative memory are observed to be closely related to the kinds of CDMA receivers, such as correlator, decorrelator and minimum mean square error (MMSE) receiver. Simulation results show that such associative memory models can memorize Markov patterns with smaller error rate than i.i.d. patterns.

  • 非同期CDMA通信から導かれる連想記憶の結合重み

    井上 翔太, 實松 豊, 香田 徹

    情報理論とその応用シンポジウム予稿集 = The proceedings of the Symposium on Information Theory and Its Applications   2005.11

     More details

    Language:Japanese  

  • Associative Memories with Asynchronously Overlapping Connections Learn Markov Pattern Better than I.I.D.

    JITSUMATSU Yutaka, INOUE Shota, KOHDA Tohru

    2005.11

     More details

    Language:English  

    Associative Memories with Asynchronously Overlapping Connections Learn Markov Pattern Better than I.I.D.

  • Variance of Average Interference Parameter for LFSR and Random Markov Codes

    JITSUMATSU Yutaka, KHAN M. Tahir Abbas, KOHDA Tohru

    2005.11

     More details

    Language:English  

    Variance of Average Interference Parameter for LFSR and Random Markov Codes

  • Code acquisition in DS/CDMA systems by employing a detector based on a posteriori probability calculation

    MTA Khan, N Eshima, Y Jitsumatsu, T Kohda

    IEICE TRANSACTIONS ON COMMUNICATIONS   2005.10

     More details

    Language:English  

    DOI: 10.1093/ietcom/e88-b.10.4047

  • Code acquisition in DS/CDMA systems by employing a detector based on a posteriori probability calculation

    MTA Khan, N Eshima, Y Jitsumatsu, T Kohda

    IEICE TRANSACTIONS ON COMMUNICATIONS   2005.10

     More details

    Language:English  

    DOI: 10.1093/ietcom/e88-b.10.4047

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告. WBS, ワイドバンドシステム : IEICE technical report   2005.3

     More details

    Language:English  

  • Code Acquisition in Asynchronous DS/CDMA Systems

    KHAN Tahir Abbas, ESHIMA Nobuoki, JITSUMATSU Yutaka, KOHDA Tohru

    2005.3

     More details

    Language:English  

    Code Acquisition in Asynchronous DS/CDMA Systems
    Synchronized users signals are subtracted from received signal at the base station of a direct sequence code division multiple access (DS/CDMA) system to aid code acquisition of new users. Expressions for expectation and variance of the correlator output corresponding to a synchronization chip and otherwise are derived for the asynchronous environment. A novel detector based on a posteriori probability threshold rule is proposed for code acquisition. Computer simulations show significant performance improvements over conventional code acquisition methods. The technique is also applicable for signals modulated by Markov codes and computer simulations show superiority of Markov codes over independent and identically distributed (i.i.d.) codes.

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告   2005.3

     More details

    Language:English  

    非同期DS/CDMA(direct sequence/code division multiple access)システムにおいてスペクトル拡散(Spread Spectrum ; SS)符号にマルコフ性を持たせると, 従来のGold符号や独立同分布(independent and identically distributed ; i.i.d.)系列よりもビット誤り率が低くなることがG. Mazziniらによって示された[1].一方, SS符号にはビット誤り率が低いことだけでなく, 同期を素早く確立できることも求められる.著者らは[9]において, チップ同期システムにおける事後確率に基づく同期捕捉法を提案した.本稿ではこの手法をチップ非同期システムの場合に拡張する.その結果, マルコフ符号は事後確率の計算が容易であるという良い性質を持つことが分かる.

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告   2005.3

     More details

    Language:English  

    非同期DS/CDMA(direct sequence/code division multiple access)システムにおいてスペクトル拡散(Spread Spectrum ; SS)符号にマルコフ性を持たせると, 従来のGold符号や独立同分布(independent and identically distributed ; i.i.d.)系列よりもビット誤り率が低くなることがG. Mazziniらによって示された[1].一方, SS符号にはビット誤り率が低いことだけでなく, 同期を素早く確立できることも求められる.著者らは[9]において, チップ同期システムにおける事後確率に基づく同期捕捉法を提案した.本稿ではこの手法をチップ非同期システムの場合に拡張する.その結果, マルコフ符号は事後確率の計算が容易であるという良い性質を持つことが分かる.

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告   2005.3

     More details

    Language:English  

    非同期DS/CDMA(direct sequence/code division multiple access)システムにおいてスペクトル拡散(Spread Spectrum ; SS)符号にマルコフ性を持たせると, 従来のGold符号や独立同分布(independent and identically distributed ; i.i.d.)系列よりもビット誤り率が低くなることがG. Mazziniらによって示された[1].一方, SS符号にはビット誤り率が低いことだけでなく, 同期を素早く確立できることも求められる.著者らは[9]において, チップ同期システムにおける事後確率に基づく同期捕捉法を提案した.本稿ではこの手法をチップ非同期システムの場合に拡張する.その結果, マルコフ符号は事後確率の計算が容易であるという良い性質を持つことが分かる.

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   2005.3

     More details

    Language:English  

  • チップ非同期DS/CDMA通信におけるマルコフ拡散符号の同期捕捉

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告. IT, 情報理論   2005.3

     More details

    Language:English  

  • Reduction of MAI in asynchronous DS/CDMA systems using post-filter

    Y Jitsumatsu, TA Khan, T Kohda

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   2004.9

     More details

    Language:English  

  • チップ同期 DS/CDMA システムにおけるマルコフ SS 符号の同期捕捉

    實松 豊, 江島 伸興, 香田 徹

    電子情報通信学会技術研究報告. IT, 情報理論   2003.9

     More details

    Language:English  

    カオス力学系から生成される系列をスペクトル拡散(SS)通信の拡散符号に応用する方法には様々な形式のものが提案されている. 中でもマルコフ区分線形写像より生成されるカオス2値系列は, 非同期DS/CDMAシステムに用いた場合に, 従来の線形フィードバックシフトレジスタ(LFSR)系列よりもビット誤り率の面で優れることが確認され, 特に注目されている. これらの拡散系列を実際に非同期SS通信に組み込むには, ビット誤り率の面に加え, 受信側で同期捕捉が可能であることが求められる. マルコフ性を有する上記の系列は低いビット誤り率を示す一方, 同期捕捉が従来のLFSR系列と同程度の難易度で行えるかについては, いまだ明らかにされていない. 本稿では, チップ同期DS/CDMA(直接拡散/符号分割多元接続)システムにおいて, 拡散符号がマルコフ性を有する場合に, 各チップにおける出力が無相関となる逆相関受信器を提案する. さらに, この逆相関受信器の出力から事後確率を計算し, 同期捕捉を行う方法を提案する.

  • Bit error rate of incompletely synchronised correlator in asynchronous DS/CDMA system using SS Markovian codes

    Y Jitsumatsu, T Kohda

    ELECTRONICS LETTERS   2002.4

     More details

    Language:English  

    DOI: 10.1049/el:20020276

  • Bit error rate of incompletely synchronised correlator in asynchronous DS/CDMA system using SS Markovian codes

    Y Jitsumatsu, T Kohda

    ELECTRONICS LETTERS   2002.4

     More details

    Language:English  

    DOI: 10.1049/el:20020276

  • マルコフ連鎖に基づくスペクトル拡散符号の自己相関関数について

    實松 豊, 香田 徹

    情報理論とその応用シンポジウム予稿集 = The proceedings of the Symposium on Information Theory and Its Applications   2001.12

     More details

    Language:Japanese  

  • On a Synchronization Problem in Asynchronous DS/CDMA System (確率数値解析に於ける諸問題(5))

    實松 豊, 香田 徹

    数理解析研究所講究録   2001.12

     More details

    Language:English  

  • On the number of solutions for a class of piecewise-linear equations related to transistor circuits

    Y Jitsumatsu, T Nishi

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   2001.9

     More details

    Language:English  

  • 多元通信における同期確立の難易度について

    實松 豊, 香田 徹

    電子情報通信学会技術研究報告. IT, 情報理論   2001.7

     More details

    Language:Japanese  

    直接拡散方式による符号分割多元接続(DS-CDMA)においては, 拡散符号が重要な役割を担う.従来はM系列やこれを基本としたKasami系列やGold系列等のシフトレジスタ系列がよく利用されてきた.最近, 非同期のDS-CDMAシステムにおいては, マルコフ情報源から生成される系列(マルコフ系列)がシフトレジスタ系列よりも低いビット誤り確率を達成可能であることが報告された.しかしマルコフ系列を使用した場合, 拡散符号の自己相関がシフトレジスタ系列に比べ高いため, 同期の捕捉・保持を困難にすること, またマルチパス環境下においては自己干渉として性能を劣化させることが懸念される.本稿では, 拡散符号としてマルコフ系列を用いた場合の非同期DS-CDMAにおけるビット誤り率を理論的に検証するため, 相互および自己相関関数の評価を行い, 同期確立の難易度について議論する.

  • 多元通信における同期確立の難易度について

    実松豊, 香田徹

    電子情報通信学会技術研究報告   2001.7

     More details

    Language:Japanese  

  • n個の理想ダイオード関数を含む区分線形方程式が2^l個(l≦n)の解を持つための十分条件

    實松 豊, 西 哲生

    電子情報通信学会技術研究報告. NLP, 非線形問題   2001.3

     More details

    Language:Japanese  

    m個のトランジスタ、線形受動抵抗、直流電源からなる回路は最大何個の動作点を持つかという問題が非線形回路の分野で関心を集めているが、m=1,2の場合を除いては今までのところ明らかになっていない。Ebers-Mollの等価回路を用いれば、トランジスタ回路の方程式は一般にf_k(x_k)+a_<k1>x_1+・・・+a_<kn>x_n=b_k(k=1,2,・・・n)と書ける(ただし、n=2m)。通常方f_k(x_k)は指数関数型の単調増加関数であるが、本研究ではこれを簡略化して理想ダイオード関数を用いた。このとき、上記の方程式は2^n個の部分領域を持つ区分線形方程式となる。本稿では、この方程式の解の個数について議論しており、行列[a_<ij>]の任意のl個の行(0&le;l&le;n)に-1をかけたものが優対角行列ならば、ちょうど2^l個の解を持つことを示す。

  • 2トランジスタ回路に対する区分線形方程式の解の個数の上界

    實松 豊, 西 哲生

    九州大学大学院システム情報科学紀要   2001.3

     More details

    Language:Japanese  

    This paper discusses the number of solutions for a class of piecewise-linear equations related to two-transistor circuits composed of transistors, linear passive resistors, and DC sources. By using Ebers-Moll model, a transistor is replaced by two nonlinear resistors and two linear current-controlled current sources. We assume in this paper that the nonlinear resistors are ideal diodes. Then a circuit equation for the above circuit is a piecewise-linear equation Ti + Gv = b where each component ik and vk of the vectors i and v respectively are subject to vkik = 0, vk < 0, and ik > 0. We show that the number of solutions for the equation is at most 5.

    DOI: 10.15017/1515724

  • n個の理想ダイオード関数を含む区分線形方程式が2l個(l≦n)の解を持つための十分条件

    実松豊, 西哲生

    電子情報通信学会技術研究報告   2001.3

     More details

    Language:Japanese  

  • Relation between the stored and the dissipated energies of a circuit composed of linear capacitors, linear/nonlinear resistors and dc voltage sources

    Y Jitsumatsu, T Nishi

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   1999.9

     More details

    Language:English  

  • 1個のキャパシタ、理想ダイオード、線形抵抗、直流電圧源からなる回路における消費エネルギーに関する一考察

    實松 豊, 西 哲生

    電子情報通信学会技術研究報告. CAS, 回路とシステム   1999.9

     More details

    Language:Japanese  

    初期電荷0のキャパシタに直流電圧源Eで充電をするとき、抵抗での消費エネルギーがキャパシタの蓄積エネルギー1/2CE^2に等しくなることが知られている。このことから、キャパシタに充電するに蓄積エネルギーと等量のエネルギーが必然的に抵抗で消費されるように思われるが、非線形抵抗を用いれば、この関係は成立しない。本稿では、理想ダイオード、線形抵抗、直流電圧源を用いて1個のキャパシタを充電する場合について、ある妥当な条件の下で消費エネルギーが最小となる回路について考察する。電圧源を2個用いて、消費エネルギーが線形の場合に比べ1/3となる回路、また、電圧源を3個用いて、消費エネルギーが線形の場合に比べ1/7となる回路を示す。また、一般にn個の電圧源を用いる場合についても考察し、消費エネルギー最小ではないが、一般のnについて構成可能な回路を与える。

  • 1個のキャパシタ、理想ダイオード、線形抵抗、直流電圧源からなる回路における消費エネルギーに関する一考察

    實松 豊, 西 哲生

    電子情報通信学会技術研究報告. NLP, 非線形問題   1999.9

     More details

    Language:Japanese  

    初期電荷0のキャパシタに直流電圧源Eで充電をするとき、抵抗での消費エネルギーがキャパシタの蓄積エネルギー1/2CE^2に等しくなることが知られている。このことから、キャパシタに充電するに蓄積エネルギーと等量のエネルギーが必然的に抵抗で消費されるように思われるが、非線形抵抗を用いれば、この関係は成立しない。本稿では、理想ダイオード、線形抵抗、直流電圧源を用いてl個のキャパシタを充電する場合について、ある妥当な条件の下で消費エネルギーが最小となる回路について考察する。電圧源を2個用いて、消費エネルギーが線形の場合に比べ1/3となる回路、また、電圧源を3個用いて、消費エネルギーが線形の場合に比べ1/7となる同路を示す。また、一般にn個の電圧源を用いる場合についても考察し、消費エネルギー最小ではないが、一般のnについて構成可能な回路を与える。

  • ある種の2変数連立方程式の解の最大個数

    實松 豊, 西 哲生

    電子情報通信学会論文誌. A, 基礎・境界   1999.7

     More details

    Language:Japanese  

    本論文では, 非線形連立方程式 e^<x_i>+a_<i1>x_1+a_<i2>x_2+b_i=0 (i=1,2) において, a_<ij>, b_iが任意の実数をとるとき, 実数解の最大個数がちょうど5個であることを示す.

▼display all

Industrial property rights

Patent   Number of applications: 12   Number of registrations: 4
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

  • 電子情報通信学会

  • IEEE

  • Society of Information Theory and Its Applications (SITA)

  • IEEE

  • IEICE

  • 情報理論とその応用学会

  • 電子情報通信学会

  • 電子情報通信学会

      More details

  • 情報理論とその応用学会

      More details

  • IEICE

      More details

  • IEEE

      More details

▼display all

Committee Memberships

  • Institute of Electronics, Information and Communication Engineers   TPC Member of 2023 International Conference on Emerging Technologies for Communications Technical Program Committee  

    2023.4 - 2024.3   

      More details

    Committee type:Academic society

    researchmap

  • Institute of Electronics, Information and Communication Engineers   Technical Committee on Enriched MultiMedia (EMM)  

    2022.6 - 2026.6   

      More details

    Committee type:Academic society

    researchmap

  • The Institute of Electronics, Information and Communication Engineers   Technical Commitee on Communication Systems  

    2019.6 - Present   

      More details

    Committee type:Academic society

    researchmap

  • Organizer   Domestic

    2019.6 - 2021.6   

  • 電子情報通信学会   基礎境界ソサイエティ 会計幹事   Domestic

    2019.6 - 2021.6   

  • 電気情報通信学会   通信方式研究専門委員   Domestic

    2019.6 - 2021.6   

  • 電子情報通信学会   基礎・境界ソサイエティ,SITAサブソ委員,広報担当   Domestic

    2019.5 - 2021.5   

  • Steering committee member   Domestic

    2017.5   

  • 電気情報通信学会   情報理論研究専門委員   Domestic

    2014.5 - 2020.5   

  • 電子情報通信学会   基礎・境界ソサイエティ,SITAサブソ委員,SITA担当   Domestic

    2013.5 - 2015.5   

  • 電子情報通信学会 基礎・境界ソサイエティ   CAS専門委員   Domestic

    2010.6 - 2016.5   

  • Organizer   Domestic

    2008.4 - 2010.3   

  • 情報理論とその応用学会   編集幹事   Domestic

    2008.4 - 2010.3   

  • 情報理論とその応用学会   編集幹事  

    2008   

      More details

    Committee type:Academic society

    情報理論とその応用学会

    researchmap

▼display all

Academic Activities

  • 企画立案・運営等, パネル司会・セッションチェア等

    情報通信の技術革新のための基礎数理  2022.9

     More details

    Type:Competition, symposium, etc. 

  • Mathematics for Innovation in Telecommunications Technology

    Role(s): Planning, management, etc., Panel moderator, session chair, etc.

    Institute of Mathematics for Industry  2022.9

     More details

    Type:Academic society, research group, etc. 

    researchmap

  • プログラム編集委員 International contribution

    2020.11

     More details

    Type:Competition, symposium, etc. 

    Number of participants:200

  • program committee International contribution

    International Japan-Africa Conference on Electronics, Communications and Computations 2019 (JAC-ECC2019)  ( Alexandria Egypt ) 2019.12

     More details

    Type:Competition, symposium, etc. 

    Number of participants:150

  • プログラム編集委員 International contribution

    2019.12

     More details

    Type:Competition, symposium, etc. 

    Number of participants:200

  • Screening of academic papers

    Role(s): Peer review

    2019

     More details

    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

    Proceedings of International Conference Number of peer-reviewed papers:4

  • General Secretaries International contribution

    International Symposium on Information Theory and Its Applications 2018  ( Singapore Singapore ) 2018.10

     More details

    Type:Competition, symposium, etc. 

    Number of participants:236

  • Screening of academic papers

    Role(s): Peer review

    2018

     More details

    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:3

    Number of peer-reviewed articles in Japanese journals:2

    Proceedings of International Conference Number of peer-reviewed papers:3

    Proceedings of domestic conference Number of peer-reviewed papers:2

  • 座長(Chairmanship)

    第1回情報理論および符号理論とその応用ワークショップ  ( 佐賀県唐津市 ) 2017.2

     More details

    Type:Competition, symposium, etc. 

  • Screening of academic papers

    Role(s): Peer review

    2017

     More details

    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:2

  • 座長(Chairmanship) International contribution

    2016.11

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    情報理論研究会  ( 東京工業大学 ) 2015.7

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    ( 福岡 ) 2015.3

     More details

    Type:Competition, symposium, etc. 

  • 実行委員

    情報とダイナミクスV研究集会  ( 福岡 ) 2014.3

     More details

    Type:Competition, symposium, etc. 

    Number of participants:20

  • Organizer International contribution

    Workshop on Modern Error Correcting Codes  ( Tokyo Japan ) 2013.8

     More details

    Type:Competition, symposium, etc. 

    Number of participants:40

  • 実行委員

    情報とダイナミクスIV研究集会  ( 福岡市 ) 2012.3

     More details

    Type:Competition, symposium, etc. 

    Number of participants:20

  • 総務

    情報理論とその応用シンポジウム(SITA)2012  ( 大分県別府市 ) 2011.8 - 2013.3

     More details

    Type:Competition, symposium, etc. 

    Number of participants:300

  • 座長(Chairmanship)

    電子情報通信学会 回路とシステム研究会  ( 熊本 ) 2011.1

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電気関連学会九州支部連合大会  ( 福岡 ) 2010.9

     More details

    Type:Competition, symposium, etc. 

  • 編集

    情報理論とその応用シンポジウム(SITA)2009  ( 山口県湯田温泉 ) 2009.11 - 2009.12

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship)

    電子情報通信学会 情報理論研究会  ( 函館 ) 2009.3

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    2008.9

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    2006.9

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    2005.9

     More details

    Type:Competition, symposium, etc. 

  • 座長(Chairmanship) International contribution

    2005.5

     More details

    Type:Competition, symposium, etc. 

  • Secretary International contribution

    2004 International Symposium on Nonlinear Theory and Its Applications (NOLTA2004)  ( Fukuoka Japan ) 2004.11

     More details

    Type:Competition, symposium, etc. 

    Number of participants:500

  • 座長(Chairmanship)

    電気関係学会九州支部連合大会  ( 熊本県,崇城大学 ) 2003.10

     More details

    Type:Competition, symposium, etc. 

▼display all

Research Projects

  • Development of Fundamental Theory for Communication and Sensing over a doubly selective channel in highly mobile environment

    Grant number:23K26104  2023 - 2026

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

      More details

    Grant type:Scientific research funding

    CiNii Research

  • 高速移動に伴う二重選択性通信路を介した通信及びセンシングの基礎理論構築

    Grant number:23H01409  2023 - 2026

    日本学術振興会  科学研究費助成事業  基盤研究(B)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • Terminal collaboration technology that both improves energy efficiency and communication performance

    Grant number:23H00474  2023 - 2026

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

    CiNii Research

  • 情報通信の技術革新のための基礎数理

    2022

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • 機械学習を用いてCTで得られた岩石間隙形状から物性を直接推定する新手法の開発

    Grant number:20K20948  2020 - 2021

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    辻 健, 實松 豊, Jiang Fei, 平野 靖

      More details

    Grant type:Scientific research funding

    地球科学や資源工学では、地層内部の流体挙動や弾性特性を調べることが多く、室内実験による測定が行われてきた。室内実験には長い時間を要し、測定環境や実験する人によって結果が変わることもあった。一方、これらの物理特性は、岩石内部の間隙形状に強く依存していることが知られている。そこで本研究では、高解像度CTによってデジタル化された岩石内部の3次元間隙形状に対して、機械学習や数学的手法を適用し、浸透率や弾性定数といった物理特性を推定する手法を開発する。さらにこの機械学習を用いた手法を発展させ、上記の手法と反対に、測定データ(例えば弾性波形)から間隙形状を推定する手法開発も行う。

    CiNii Research

  • 力学系に基づく乱数系列を用いた盗聴耐性付きスパース符号分割通信

    Grant number:19K12156  2019 - 2022

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • 力学系に基づく乱数系列を用いた盗聴耐性付きスパース符号分割通信

    Grant number:19K12156  2019 - 2021

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • 多重解像度深層学習によるMRIの検査時間短縮

    2019

    AMED

      More details

    Authorship:Principal investigator  Grant type:Contract research

  • 機械学習によるMRIの撮像時間短縮

    Grant number:17K00308  2017 - 2019

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 機械学習によるMRIの撮像時間短縮

    Grant number:17K00308  2017 - 2019

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • ベータ写像に基づくAD変換器を用いた製造誤差に頑健なユニバーサル乱数生成

    Grant number:16K00333  2016 - 2018

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • ベータ写像に基づくAD変換器を用いた製造誤差に頑健なユニバーサル乱数生成

    Grant number:16K00333  2016 - 2018

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • 多重移動物体検出レーダと超解像MRIを通した圧縮センシングの数理構造抽出(公募研究)

    Grant number:4503  2014 - 2015

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • オフセットを許容する時間・周波数領域同期法

    Grant number:25820162  2013 - 2016

    科学研究費助成事業  若手研究(B)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • オフセットを許容する時間・周波数領域同期法

    Grant number:25820162  2013 - 2015

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • 最先端研究開発支援プログラム「複雑系数理モデル学の基礎理論構築とその分野横断的科学技術応用」

    2010.3 - 2014.3

    総務省(日本) 

      More details

    Authorship:Coinvestigator(s) 

    我が国独自の学問「数理工学(Mathematical Engineering)」やカオス、フラクタル、複雑ネットワークなどの工学応用を目指す「カオス工学(Chaos Engineering)」を基にして、複雑系数理モデル学の構築とその様々な分野横断的科学技術応用を目指す。

  • 複雑系数理モデル学の基礎理論構築とその分野横断的科学技術応用

    2009 - 2013

    最先端研究開発支援プログラム(総務省)

      More details

    Authorship:Coinvestigator(s)  Grant type:Contract research

  • 力学系理論による符号設計とそのディジタル通信への応用

    Grant number:20360174  2008 - 2011

    日本学術振興会  科学研究費助成事業  基盤研究(B)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 力学系理論による符号設計とそのディジタル通信への応用

    Grant number:20360174  2008 - 2011

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • 空間ゆらぎのある記憶パタンを埋め込んだ連想記憶空間

    Grant number:20700210  2008 - 2010

    科学研究費助成事業  若手研究(B)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • 空間ゆらぎのある記憶パタンを埋め込んだ連想記憶

    Grant number:20700210  2008 - 2010

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • 情報量概念を基盤とした学習理論の展開

    Grant number:19300051  2007 - 2010

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • 情報量概念を基盤とした学習理論の展開

    Grant number:19300051  2007 - 2010

    日本学術振興会  科学研究費助成事業  基盤研究(B)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 合原複雑数理モデルプロジェクト

    2006.12 - 2008.10

    ERATO,JST(日本) 

      More details

    Authorship:Coinvestigator(s) 

    最近Princeton大のDaudechiesらにより提案されたベータ変換を用いるA/D変換にカオス力学系の立場からの検証を行う. A/D変換における標本化・量子化という根本問題にカオス理論による考察を行うことを目的とする.

  • カオスに基くスペクトル拡散符号を用いたマルチユーザ同期捕捉

    Grant number:17760312  2005 - 2006

    科学研究費助成事業  若手研究(B)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • カオスに基づくスペクトル拡散符号を用いたマルチユーザ同期捕捉

    Grant number:17760312  2005 - 2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Authorship:Principal investigator  Grant type:Scientific research funding

  • カオスに基づく擬似乱数を用いたスペクトラム拡散電子透かしシステム

    Grant number:17650065  2005 - 2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づく擬似乱数を用いたスペクトラム拡散電子透かしシステム

    Grant number:17650065  2005 - 2006

    科学研究費助成事業  萌芽研究

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 多端子情報理論的立場からの情報通信網の効率,信頼性および安全性解析

    Grant number:16560340  2004 - 2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づいたi.i.d.2値系列によるストリーム暗号システム

    Grant number:16016269  2004 - 2005

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づいたi.i.d.2値系列によるストリーム暗号システム

    Grant number:16016269  2004 - 2005

    科学研究費助成事業  特定領域研究(A)特定領域研究(B)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • マルコフ性を有するカオス拡散符号を用いた非同期DS/CDMAシステム

    Grant number:15360206  2003 - 2006

    日本学術振興会  科学研究費助成事業  基盤研究(B)

      More details

    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • マルコフ性を有するカオス拡散符号を用いた非同期DS/CDMAシステム

    Grant number:15360206  2003 - 2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づいたi.i.d.2値系列によるストリーム暗号システム

    Grant number:15017271  2003

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • トランジスタ回路の解の個数と安定性に関する理論的検討

    Grant number:13650414  2001 - 2003

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づいたi.i.d.2値系列によるストリーム暗号システム

    Grant number:14019072  2001 - 2002

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • カオスに基づいたi.i.d.2値系列によるストリーム暗号システム

    Grant number:13224075  2001

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • スペクトル拡散方式を利用した画像伝送時における電子透かし

    Grant number:12875071  2000 - 2002

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • デジタルカオス暗号システム

    Grant number:12450155  2000 - 2002

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

  • マルコフ情報源の遷移確率およびスペクトルの推定に関する研究

    Grant number:11554004  1999 - 2001

    日本学術振興会  科学研究費助成事業  基盤研究(C)

      More details

    Grant type:Scientific research funding

▼display all

Class subject

  • 情報理論(EE,ECコース)

    2024.6 - 2024.8   Summer quarter

  • 情報理論(EE,ECコース)

    2024.4 - 2024.6   Spring quarter

  • 情報理論(A・B)

    2020.4 - 2020.9   First semester

  • プログラミング演習

    2020.4 - 2020.9   First semester

  • プログラミング演習

    2020.4 - 2020.9   First semester

  • 情報学読解

    2020.4 - 2020.9   First semester

  • 情報学論述Ⅰ

    2020.4 - 2020.9   First semester

  • 情報学論議Ⅰ

    2020.4 - 2020.9   First semester

  • 信号とシステム(B)

    2019.10 - 2020.3   Second semester

  • 【サイバー】ネットワーク工学

    2019.10 - 2020.3   Second semester

  • ネットワーク工学

    2019.10 - 2020.3   Second semester

  • 情報学演示

    2019.10 - 2020.3   Second semester

  • 情報学論述Ⅱ

    2019.10 - 2020.3   Second semester

  • 情報学論議Ⅱ

    2019.10 - 2020.3   Second semester

  • (IUPE)Fund. of Electrical Eng and Computer Science I

    2019.10 - 2019.12   Fall quarter

  • 基幹教育セミナー

    2019.6 - 2019.8   Summer quarter

  • 情報理論(A,B)

    2019.4 - 2019.9   First semester

  • 情報学読解

    2019.4 - 2019.9   First semester

  • 情報学論述Ⅰ

    2019.4 - 2019.9   First semester

  • 情報学論議Ⅰ

    2019.4 - 2019.9   First semester

  • 信号とシステム(B)

    2018.10 - 2019.3   Second semester

  • 【サイバー】ネットワーク工学

    2018.10 - 2019.3   Second semester

  • ネットワーク工学

    2018.10 - 2019.3   Second semester

  • 情報学演示

    2018.10 - 2019.3   Second semester

  • 情報学論述Ⅱ

    2018.10 - 2019.3   Second semester

  • 情報学論議Ⅱ

    2018.10 - 2019.3   Second semester

  • 信号とシステム

    2018.10 - 2019.3   Second semester

  • ネットワーク工学

    2018.10 - 2019.3   Second semester

  • 基幹教育セミナー

    2018.6 - 2018.8   Summer quarter

  • 情報理論

    2018.4 - 2018.9   First semester

  • プログラミング演習

    2018.4 - 2018.9   First semester

  • 情報学読解

    2018.4 - 2018.9   First semester

  • 情報学論述Ⅰ

    2018.4 - 2018.9   First semester

  • 情報学論議Ⅰ

    2018.4 - 2018.9   First semester

  • プログラミング演習

    2018.4 - 2018.9   First semester

  • 基幹教育セミナー

    2018.4 - 2018.9   First semester

  • 情報理論

    2018.4 - 2018.9   First semester

  • 信号とシステム

    2017.10 - 2018.3   Second semester

  • 信号とシステム

    2017.10 - 2018.3   Second semester

  • ネットワーク工学

    2017.10 - 2018.3   Second semester

  • ネットワーク工学

    2017.10 - 2018.3   Second semester

  • 情報学演示

    2017.10 - 2018.3   Second semester

  • 情報学論述Ⅱ

    2017.10 - 2018.3   Second semester

  • 情報学論議Ⅱ

    2017.10 - 2018.3   Second semester

  • ネットワーク工学

    2017.10 - 2018.3   Second semester

  • Advanced Research in Communication Systems

    2017.4 - 2018.3   Full year

  • 国際演示技法

    2017.4 - 2018.3   Full year

  • 知的財産技法

    2017.4 - 2018.3   Full year

  • ティーチング演習

    2017.4 - 2018.3   Full year

  • 先端プロジェクト管理技法

    2017.4 - 2018.3   Full year

  • Overseas Internship

    2017.4 - 2018.3   Full year

  • Scientific English Presentation

    2017.4 - 2018.3   Full year

  • Intellectual Property Management

    2017.4 - 2018.3   Full year

  • Exercise in Teaching

    2017.4 - 2018.3   Full year

  • Advanced Project Management Technique

    2017.4 - 2018.3   Full year

  • 情報学特別講究第一

    2017.4 - 2018.3   Full year

  • 情報学特別講究第二

    2017.4 - 2018.3   Full year

  • Advanced Research in Informatics I

    2017.4 - 2018.3   Full year

  • Advanced Research in Informatics II

    2017.4 - 2018.3   Full year

  • 情報学特別演習

    2017.4 - 2018.3   Full year

  • Advanced Seminar in Informatics

    2017.4 - 2018.3   Full year

  • 情報系統特別講究

    2017.4 - 2018.3   Full year

  • 情報理論

    2017.4 - 2017.9   First semester

  • 情報学読解

    2017.4 - 2017.9   First semester

  • 情報学論述Ⅰ

    2017.4 - 2017.9   First semester

  • 情報学論議Ⅰ

    2017.4 - 2017.9   First semester

  • 電気情報工学入門Ⅰ

    2017.4 - 2017.9   First semester

  • 情報理論

    2017.4 - 2017.9   First semester

  • ネットワーク工学

    2016.10 - 2017.3   Second semester

  • 信号とシステム

    2016.10 - 2017.3   Second semester

  • 信号とシステム

    2015.10 - 2016.3   Second semester

  • ネットワーク工学

    2015.10 - 2016.3   Second semester

  • 情報科学講究

    2015.10 - 2016.3   Second semester

  • 情報理論

    2015.4 - 2015.9   First semester

  • 信号とシステム

    2014.10 - 2015.3   Second semester

  • ネットワーク工学特論

    2014.10 - 2015.3   Second semester

  • 情報科学

    2014.10 - 2015.3   Second semester

  • 情報理論

    2014.4 - 2014.9   First semester

  • 信号とシステム

    2013.10 - 2014.3   Second semester

  • 情報学演習

    2013.10 - 2014.3   Second semester

  • 情報科学の世界

    2013.10 - 2014.3   Second semester

  • 情報科学の世界

    2013.10 - 2014.3   Second semester

  • ネットワーク工学特論

    2013.10 - 2014.3   Second semester

  • 情報学講究

    2013.4 - 2014.3   Full year

  • 情報理論

    2013.4 - 2013.9   First semester

  • 信号とシステム

    2012.10 - 2013.3   Second semester

  • 情報学演習

    2012.10 - 2013.3   Second semester

  • ネットワーク工学特論

    2012.10 - 2013.3   Second semester

  • 情報学講究

    2012.4 - 2013.3   Full year

  • 情報理論

    2012.4 - 2012.9   First semester

  • 情報科学講究

    2011.10 - 2012.3   Second semester

  • ネットワーク工学特論

    2011.10 - 2012.3   Second semester

  • 信号とシステム

    2011.10 - 2012.3   Second semester

  • 通信工学数理特論

    2011.10 - 2012.3   Second semester

  • 情報学演習

    2011.10 - 2012.3   Second semester

  • 情報学講究

    2011.4 - 2012.3   Full year

  • 情報理論

    2011.4 - 2011.9   First semester

  • 情報幾何学演習

    2011.4 - 2011.9   First semester

  • 信号とシステム

    2010.10 - 2011.3   Second semester

  • 情報科学講究

    2010.10 - 2011.3   Second semester

  • 情報理論

    2010.4 - 2010.9   First semester

  • 情報幾何学演習

    2010.4 - 2010.9   First semester

  • アルゴリズム論演習

    2010.4 - 2010.9   First semester

  • ネットワーク工学特論

    2010.4 - 2010.9   First semester

  • 通信工学数理特論

    2009.10 - 2010.3   Second semester

  • 理系主題科目VII(情報科学)「情報科学の世界」

    2009.10 - 2010.3   Second semester

  • 信号とシステム

    2009.10 - 2010.3   Second semester

  • プログラミング演習

    2009.10 - 2010.3   Second semester

  • 情報理論

    2009.4 - 2009.9   First semester

  • 情報数理特論

    2008.10 - 2009.3   Second semester

  • プログラミング演習

    2008.10 - 2009.3   Second semester

  • 情報処理演習I

    2008.4 - 2008.9   First semester

  • 情報理論

    2008.4 - 2008.9   First semester

  • 情報数理特論

    2007.10 - 2008.3   Second semester

  • 情報理論

    2007.4 - 2007.9   First semester

  • 信号とシステムⅡ(CM)

    2024.12 - 2025.2   Winter quarter

  • 信号とシステムⅡ

    2024.12 - 2025.2   Winter quarter

  • ネットワーク工学Ⅱ

    2024.12 - 2025.2   Winter quarter

  • [G]Communication Systems II

    2024.12 - 2025.2   Winter quarter

  • (後期)信号とシステム(C)

    2024.10 - 2025.3   Second semester

  • 情報理工学論述Ⅱ

    2024.10 - 2025.3   Second semester

  • 情報理工学論議Ⅱ

    2024.10 - 2025.3   Second semester

  • 情報理工学演示

    2024.10 - 2025.3   Second semester

  • 信号とシステム(R2以前入学者用)

    2024.10 - 2025.3   Second semester

  • ネットワーク工学

    2024.10 - 2025.3   Second semester

  • 【サイバー】ネットワーク工学

    2024.10 - 2025.3   Second semester

  • 信号とシステムⅠ(CM)

    2024.10 - 2024.12   Fall quarter

  • 信号とシステムⅠ

    2024.10 - 2024.12   Fall quarter

  • ネットワーク工学Ⅰ

    2024.10 - 2024.12   Fall quarter

  • [G]Communication Systems I

    2024.10 - 2024.12   Fall quarter

  • 情報理論Ⅱ(EC・EE)

    2024.6 - 2024.8   Summer quarter

  • 情報理工学特別研究Ⅱ

    2024.4 - 2025.3   Full year

  • 情報理工学特別研究Ⅰ

    2024.4 - 2025.3   Full year

  • 情報理工学特別演習

    2024.4 - 2025.3   Full year

  • Advanced Seminar in Information Science and Technology

    2024.4 - 2025.3   Full year

  • Advanced Research in Information Science and Technology II

    2024.4 - 2025.3   Full year

  • Advanced Research in Information Science and Technology I

    2024.4 - 2025.3   Full year

  • 【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

  • 情報理論(A・B)【前期】

    2024.4 - 2024.9   First semester

  • 情報理論(C)【前期】

    2024.4 - 2024.9   First semester

  • 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

  • 情報理論Ⅰ(EC・EE)

    2024.4 - 2024.6   Spring quarter

▼display all

FD Participation

  • 2020.12   Role:Participation   Title:令和2年度 第2回工学部FD(1日目) 総合型選抜の実施に向けて―面接の全般的な内容(注意事項、採点方法など)

    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: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]

  • 2020.9   Role:Participation   Title:M2B学習支援システム講習会(オンライン開催)◇初級編・中級編◇10:00~12:00

    Organizer:University-wide

  • 2020.7   Role:Participation   Title:アフターコロナの大学はどうあるべきか

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.6   Role:Participation   Title:どんな3ポリシーが、どのように役立つのか ー 九州大学カリキュラム・マップの威力 -

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2019.6   Role:Participation   Title:8大学情報系研究科長会議の報告

    Organizer:[Undergraduate school/graduate school/graduate faculty]

▼display all

Other educational activity and Special note

  • 2019  Class Teacher 

  • 2017  Class Teacher 

  • 2014  Class Teacher 

  • 2013  Class Teacher 

  • 2008  Class Teacher 

Social Activities

  • 九州大学 ワーク アンド ライフ

    九州大学男女共同参画推進室  2017.12

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

  • なし

    2004.4

     More details

    Audience: General, Scientific, Company, Civic organization, Governmental agency

  • なし

    2004.4

     More details

    Audience: Infants, Schoolchildren, Junior students, High school students

Media Coverage

  • なし

    2004.4

     More details

    なし

Educational Activities for Highly-Specialized Professionals in Other Countries

  • 2004.4 - 2005.3   なし

Travel Abroad

  • 2016.1 - 2016.10

    Staying countory name 1:United States   Staying institution name 1:University of Maryland