Updated on 2026/10/15

写真a

 
KASAI KENTA
 
Organization
School of Engineering Associate Professor
Title
Associate Professor
Homepage
https://kasai.ict.eng.isct.ac.jp/
External link

Degree

  • Ph. D

Research Interests

  • quantum error correction

  • Quantum LDPC codes

Research Areas

  • Informatics / Theory of informatics  / Quantum Error Correction

Education

  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Department of Communications and Integrated Systems, Doctoral Program

    2003.4 - 2006.3

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    Notes： Entered the doctoral program in April 2003; completed in March 2006.

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Department of Communications and Integrated Systems, Master's Program

    2001.4 - 2003.3

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    Notes： Entered the master's program in April 2001; completed in March 2003.

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  • Tokyo Institute of Technology   School of Engineering   Department of Computer Science

    1999.4 - 2001.3

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    Notes： Transferred into the third year in April 1999; graduated in March 2001.

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  • Tokyo National College of Technology   Department of Computer Science

    - 1999.3

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    Notes： Graduated in March 1999.

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Research History

  • Institute of Science Tokyo   Associate Professor

    2024.10

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  • Tokyo Institute of Technology   Associate Professor

    2012.4 - 2024.9

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  • Tokyo Institute of Technology   Science of Engineering   Assistant Professor

    2009.4 - 2012.3

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  • Tokyo Institute of Technology   Science of Engineering

    2007

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  • Tokyo Institute of Technology   Science of Engineering

    2006

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Committee Memberships

  • 8th International Conference on Quantum Error Correction (QEC 2026)   Program Committee Member  

    2026   

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    Committee type：Other

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  • 2023 IEEE 34th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC): Track 1: PHY & Fundamentals   Technical Program Committee Reviewer  

    2023   

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    Committee type：Other

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  • 12th International Symposium on Topics in Coding (ISTC 2023)   Technical Program Committee Member  

    2023   

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    Committee type：Other

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  • 2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC): Track 1 - PHY and Fundamentals   Technical Program Committee Member  

    2020   

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    Committee type：Other

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  • International Symposium on Information Theory and Its Applications (ISITA 2020)   Technical Program Committee Member  

    2020   

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    Committee type：Other

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  •   Technical Program Committee Member, International Symposium on Information Theory and Its Applications (ISITA 2018)  

    2018   

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    Committee type：Academic society

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  • The Institute of Electronics, Information and Communication Engineers (IEICE)   Editorial Committee Member, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Section A)  

    2017.6 - 2020   

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    Committee type：Academic society

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  •   Technical Program Committee Member, 2017 IEEE International Symposium on Information Theory (ISIT 2017)  

    2017   

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    Committee type：Academic society

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  •   Technical Program Committee Member, 2015 IEEE Information Theory Workshop (ITW 2015)  

    2015   

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    Committee type：Academic society

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  •   Technical Program Committee Member, International Symposium on Information Theory and Its Applications (ISITA 2014)  

    2014   

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    Committee type：Academic society

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  •   Technical Program Committee Member, 2014 IEEE International Symposium on Information Theory (ISIT 2014)  

    2014   

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    Committee type：Academic society

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▼display all

Papers

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MISC

  • Finite-Degree Quantum LDPC Codes Reaching the Gilbert-Varshamov Bound International journal

    Kenta Kasai

    CoRR   abs/2603.24588   2026.3

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    We construct nested Calderbank-Shor-Steane code pairs with non-vanishing coding rate from Hsu-Anastasopoulos codes and MacKay-Neal codes. In the fixed-degree regime, we prove relative linear distance with high probability. Moreover, for several finite degree settings, we prove Gilbert-Varshamov distance by a rigorous computer-assisted proof.

    arXiv

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  • Performance Analysis of Spatially-Coupled MacKay-Neal Codes on Channels with Memory

    115 ( 501 )   157 - 162   2016.3

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    Language：Japanese  

    CiNii Books

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  • Spatially-Coupled Coding Approaching Symmetric Information Rate of Finite-State-Markov Fading Channels

    115 ( 396 )   267 - 271   2016.1

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    Language：Japanese  

    CiNii Books

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  • A Necessary Condition for Universally Achieving the Capacity with Spatially-Coupled Hsu-Anastasopoulos Fountain Codes

    IGARASHI Yuki, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   114 ( 34 )   43 - 48   2014.5

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    In this report, we deal with fountain coding scheme in which a sender sends infinitely long coded bits until receivers successfully complete decoding. A fountain code is called universal if for arbitrary C∈(0,1), the code achieve any binary-input memoryless symmetric channels of capacity C. We give a necessary condition that a spatially-coupled Hsu-Anastasopoulos fountain code is universal. We numerically observe that the most efficiently decodable spatially-coupled HA fountain code satisfying the necessary condition achieves the capacity of the binary symmetric channels and binary-input additive white Gaussian noise channels by density evolution.

    CiNii Books

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  • AT-2-1 空間結合符号とその研究動向(AT-2.空間結合符号-理論限界を達成する符号-,チュートリアルセッション,ソサイエティ企画)

    笠井 健太

    電子情報通信学会総合大会講演論文集   2014   "SS - 19"-"SS-22"   2014.3

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

    CiNii Books

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  • A Proof That Spatially-Coupled (l,3,3) MacKay-Neal Codes Achieve the Capacity of BEC

    OKAZAKI Takuya, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   113 ( 411 )   23 - 27   2014.1

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    It was shown that spatially-coupled MacKay-Neal (MN) codes and spatially-coupled Hsu-Anastasopoulos codes achieve the capacity of the BEC by numerical experiment. Obata et al. proved that spatially-coupled (l,2,2) MN codes achieve the capacity. However, it has been observed that spatially-coupled (l,2,2) MN codes have higher error floors than spatially-coupled (l,3,3) MN codes. In this paper, we prove that spatially-coupled (l,3,3) MN codes achieve the capacity of the BEC.

    CiNii Books

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  • A Proof for Achieving the Capacity with Spatially-Coupled Hsu-Anastasopoulos Rateless Codes

    SAKATA Kosuke, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   113 ( 411 )   29 - 34   2014.1

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    In this paper, we prove that coupled Hsu-Anastasopoulos (HA) fountain codes achieve the capacity on the BEC. In the proof, we apply the theory about potential threshold and duality of codes. As a result, we prove that coupled HA fountain codes with a bound maximum degree achieve the capacity on the BEC under BP decoding.

    CiNii Books

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  • Weight Distribution for Non-Binary Cluster LDPC Codes

    Masaki Maehara, Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第35回 情報理論とその応用シンポジウム予稿集   abs/1305.2480 ( 12 )   162 - 167   2012.12

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  • Stability Condition for Non-binary LDPC Codes over Galois Field

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第35回 情報理論とその応用シンポジウム予稿集   84 - 89   2012.12

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    Language：English  

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  • Analysis of Threshold Saturation for Spatially-Coupled MacKay-Neal Codes

    OBATA Naruomi, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   112 ( 215 )   19 - 24   2012.9

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    The belief propagation (BP) threshold of spatially-coupled (SC) low-density parity-check (LDPC) codes is equal to the MAP threshold of the underlying codes. This is called threshold saturation. Yelda et al. proved threshold saturation of SC-LDPC codes over the binary erasure channels (BEC). The approach is based on potential functions. It was observed that SC MacKay-Neal (MN) codes achieve the capacity of BEC by BP decoding. We show the potential function aproach needs a modification in the definition of energy gap. In this report, we modify the definition of energy gap and show that SC-MN codes achieve the capacity of BEC under an unproved conjecture.

    CiNii Books

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  • Efficient Termination of Spatially-Coupled Codes

    TAZOE Koji, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   112 ( 215 )   7 - 12   2012.9

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    It has been reported that spatially-coupled Hsu-Anatasopoulos (SC-HA) codes have the bounded maximum degree and approach the Shannon limit of many channels under beleif propagation decoding. However, the encoder needs to solve large linear equations to terminate the encoding process. In this paper, we proposed modified SC-HA codes which are efficiently terminable by using an accumulator. The density evolution calculations reveal that the modified codes have higher coding rate and have the same threshold as SC-HA codes.

    DOI： 10.1109/ITW.2012.6404682

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  • Message Passing Algorithm with MAP Decoding on Zigzag Cycles for Non-binary LDPC Codes

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    IEICE Technical Report   112 ( 215 )   75 - 80   2012.9

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  • Linear Time Termination of Systematic Spatially-Coupled Codes

    TAZOE Koji, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   112 ( 124 )   91 - 96   2012.7

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Spatially-coupled low-density parity-check codes attract much attention due to their capacity-achieving performance and the memory-efficient sliding-window decoding algorithm. On the other hand, the encoder needs to solve large linear equations to terminate the encoding process. In this paper, we propose modified spatially-coupled codes. The modified codes have less rate loss, i.e., higher coding rate, and have the same threshold as (d_l, d_r, L) codes and are efficiently terminable by using an accumulator.

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  • Optimization Method to Lower Error Floors for Generalized Non-binary LDPC Codes over Non-binary Input Memoryless Symmetric Channels

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    電子情報通信学会総合大会講演論文集   156 - 156   2012.3

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    Language：Japanese  

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  • Quantum Error Correction Beyond the Bounded Distance Decoding Limit.

    Kenta Kasai, Manabu Hagiwara, Hideki Imai, Kohichi Sakaniwa

    IEEE Transactions on Information Theory   58 ( 2 )   1223 - 1230   2012.2

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  • Spatially-Coupled Codes for Κ-User Erasure Multiple Access Channels

    TSUJIMOTO Takayuki, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. Information theory   111 ( 390 )   7 - 12   2012.1

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    In this paper, we study low-density parity-check codes(LDPC) coded K-user erasure multiple access channels(EMAC). The support of the belief propagation message for K-user EMAC is unbounded for K≧3. We propose a reduced-complexity decoding algorithm for which only three types of messages are used and density evolution can be applied. Furthermore, we observe that significant improvement is achieved by spatially-coupled codes.

    CiNii Books

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  • Monotonicity of Error Floors for Non-binary LDPC Codes over AWGN Channels

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    電子情報通信学会総合大会講演論文集   139 - 139   2011.3

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    Language：Japanese  

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  • Analysis of Stopping Constellation Distribution for Irregular Non-binary LDPC Code Ensemble

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第33回 情報理論とその応用シンポジウム予稿集   94-A ( 11 )   7 - 12   2010.12

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  • Analysis of Error Floors of Non-binary LDPC Codes over q-ary Discrete Memoryless Symmetric Channel

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第33回 情報理論とその応用シンポジウム予稿集   13 - 18   2010.12

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  • Quantum Error Correction with Non-Binary LDPC Codes

    KASAI Kenta, HAGIWARA Manabu, IMAI Hideki, SAKANIWA Koichi

    IEICE technical report   110 ( 265 )   135 - 145   2010.10

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    Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Quantum error correction is used in quantum computing and quantum communications to protect quantum information from quantum noise. Quantum LDPC codes are efficiently decodable quantum error correcting codes defined by sparse parity-check equations. CSS (Calderbank, Shor and Steane) codes are the most promising quantum error correcting codes. In this paper, we consider the quantum error correction over the depolarizing channels with non-binary LDPC codes defined over Galois field of size 2P. The resulting quantum codes outperform the best known quantum codes and surpass the performance limit of the bounded distance decoder. By increasing the size of the underlying Galois field, i.e., 2P, the error floors are considerably improved.

    CiNii Books

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  • Modified Cancellation for Non-binary LDPC Codes

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    電子情報通信学会総合大会講演論文集   124 - 124   2010.3

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  • Design and decoding algorithms of non-binary LDPC codes

    KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report   109 ( 328 )   43 - 49   2009.12

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    Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Recently, non-bibary LDPC codes over GF(2^m) attract much attention. Despite the considerable potential for error correction, non-binary LDPC codes suffer from huge decoding complexity and memory requirement. This report briefly reviews design and decoding schemes of non-binary LDPC codes.

    CiNii Books

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  • A Note on Analytical Solution of Covariance Evolution for Regular LDPC Codes

    Takayuki Nozaki, Kenta Kasai, Tomoharu Shibuya, Kohichi Sakaniwa

    IEICE Technical Report   102 ( 202 )   37 - 42   2009.9

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  • Analytical Solution of Covariance Evolution for Regular LDPC Codes

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第31回 情報理論とその応用シンポジウム予稿集   abs/1011.1701 ( 7 )   504 - 509   2008.10

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  • Bounds of MAP Decoding Performance for Non-binary LDPC Codes

    MUTAGUCHI Eri, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    IEICE technical report   108 ( 202 )   31 - 36   2008.9

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Montanari constructed lower bounds on the conditional entropy of the transmitted message using Multi-Poisson ensemble. In case of BEC, this bounds are identical to the conditional entropy of the transmitted message by the analysis of EXIT function by Measson. We will consider the extention of this method to LDPC codes over GF (4).

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  • Weight Distribution of Structured LDPC Code

    KASAI Kenta

    The Brain & Neural Networks   15 ( 4 )   266 - 271   2008

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    Language：Japanese   Publisher：Japanese Neural Network Society  

    DOI： 10.3902/jnns.15.266

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  • Evolution of Degree Distribution of Residual Graphs for Detailedly Represented Irregular LDPC Code Ensembles

    Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa

    第30回 情報理論とその応用シンポジウム予稿集   774 - 779   2007.11

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    Language：Japanese  

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  • Minimum Distance Distributions of Irregular LDPC Code Ensembles

    MIYAMOTO Shinya, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    29 ( 2 )   457 - 460   2006.11

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    Language：Japanese  

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  • Multi-Edge type LDPC符号のStopping Set分布(情報通信基礎サブソサイエティ合同研究会)

    大久保達也, 笠井健太, 下山裕司, 坂庭好一

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   105 ( 664 )   141 - 146   2006.3

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    Publisher：社団法人電子情報通信学会  

    Multi-Edge type LDPC符号(MET-LDPC符号)は,複数の正則/非正則LDPC符号をタナーグラフ上で連接させたグラフから定義されるLDPC符号である.下山らによって,MET-LDPC符号アンサンブルの平均重み分布が導出されている.本研究では,非正則LDPC符号アンサンブルが持つ,stopping set分布を得るための補助分布に関するある対称性を利用して,MET-LDPC符号アンサンプルの平均stopping set分布を導出している.

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  • 正則LDPC符号アンサンブルにおける2次のsupport weight distribution(情報通信基礎サブソサイエティ合同研究会)

    井對貴之, 笠井健太, 池谷亮志, 渋谷智治, 坂庭好一

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   105 ( 664 )   147 - 151   2006.3

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    Publisher：社団法人電子情報通信学会  

    ある符号のsupport weight distributionは、指定した次元とsupport weightを持つユニークな部分空間の数Extrinsic information function (EXIT)関数は、support weight distributionを用いて正確に記述することができる。本稿では、正則LDPC符号アンサンブルにおける2次の平均support weight distributionを求める方法を与えている。

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  • Second Support Weight Distribution of Regular LDPC Code Ensembles

    ITSUI Takayuki, KASAI Kenta, IKEGAYA Ryoji, SHIBUYA Tomoharu, SAKANIWA Kohichi

    IEICE technical report   105 ( 662 )   147 - 151   2006.3

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    Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

    The support weight distribution of a code is the number of unique subspaces of the code with specified dimension and support weight. The extrinsic information transfer (EXIT) function on erasure channels is exactly described by the support weight distribution. In this paper, we formulate the average second support weight distribution of regular LDPC code ensembles.

    DOI： 10.1109/ISIT.2006.261666

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  • Stopping Set Distribution of Multi-Edge type LDPC Code Ensembles

    OKUBO Tatsuya, KASAI Kenta, SHIMOYAMA Yuji, SAKANIWA Kohichi

    IEICE technical report   105 ( 662 )   141 - 146   2006.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Multi-edge type LDPC (MET-LDPC) codes can be seen as beeing defined by a Tanner graph which is obtained by concatenating some Tanner graphs of irregular LDPC codes. Average codeword weight distributions of MET-LDPC code ensembles have been derived by Shimoyama et al. We find certain symmetry of multi-edge type LDPC codes with respect to their stopping set distributions. Using the symmetry, we derive the average stopping set distribution of multi-edge type LDPC code ensembles.

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  • Multi-Edge type LDPC符号のStopping Set分布(情報通信基礎サブソサイエティ合同研究会)

    大久保達也, 笠井健太, 下山裕司, 坂庭好一

    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   105 ( 666 )   141 - 146   2006.3

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    Publisher：社団法人電子情報通信学会  

    Multi-Edge type LDPC符号(MET-LDPC符号)は,複数の正則/非正則LDPC符号をタナーグラフ上で連接させたグラフから定義されるLDPC符号である.下山らによって,MET-LDPC符号アンサンブルの平均重み分布が導出されている.本研究では,非正則LDPC符号アンサンブルが持つ,stopping set分布を得るための補助分布に関するある対称性を利用して,MET-LDPC符号アンサンブルの平均stopping set分布を導出している.

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  • 正則LDPC符号アンサンブルにおける2次のsupport weight distribution(情報通信基礎サブソサイエティ合同研究会)

    井對貴之, 笠井健太, 池谷亮志, 渋谷智治, 坂庭好一

    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   105 ( 666 )   147 - 151   2006.3

    　More details

    Publisher：社団法人電子情報通信学会  

    ある符号のsupport weight distributionは、指定した次元とsupport weightを持つユニークな部分空間の数Extrinsic information function (EXIT)関数は、support weight distributionを用いて正確に記述することができる。本稿では、正則LDPC符号アンサンプルにおける2次の平均support weight distributionを求める方法を与えている。

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  • Weight Distribution of Multi-Edge type LDPC Code Ensembles

    SHIMOYAMA Yuji, KASAI Kenta, SAKANIWA Kohichi

    28 ( 1 )   119 - 122   2005.12

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    Language：Japanese  

    CiNii Books

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  • LDPC符号のエラーフロアの解消

    市川 知行, 笠井 健太, 坂庭 好一

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   104 ( 731 )   73 - 76   2005.3

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  • LDPC 符号のエラーフロアの解消

    市川知行, 笠井健太, 坂庭好一

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   104 ( 731 )   73 - 76   2005.3

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    Publisher：社団法人電子情報通信学会  

    Low-Density Parity-Check(LDPC)符号の復号法として知られるBeleif Propagation(BP)は、ビット毎の最大事後確率(MAP)復号を近似する復号法である。低密度パリティ検査(LDPC)符号は、BP復号によって理論限界に近い復号性能を持つことが知られているが、そのSNR対誤り率復号性能曲線では、高いSNRで誤り率の低下が鈍るエラーフロアと呼ばれる領域が存在する。本研究の目的はこのエラーフロア領域を解消することである。エラーフロア領域において、度々復号に失敗する伝送ビットに対応するタナーグラフ上の変数ノードが成す部分グラフには、短いサイクルが存在する傾向がある。このサイクルに対して部分的なMAP復号を実現する復号アルゴリズムを提案し、エラーフロアが緩和された例を示す。

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  • Design of LDPC codes using degree distributions of Tanner graphs

    MIYAMOTO Shinya, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 731 )   61 - 66   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Decoding performance of LDPC (Low-Density Parity-Check) codes over a binary erasure channel (BEC) is highly dependent on the degree distributions of the Tanner graphs. We compare two types of LDPC code ensembles having uniform degree distributions and non-uniform ones respectively. Then we provide a sufficient condition for the erasure probability of a BEC for which the decoding performance for the ensembles with uniform degree distributions is superior to that with non-uniform ones.

    CiNii Books

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  • A Decoding Algorithm Lowering Error Floors of LDPC Codes

    ICHIKAWA Tomoyuki, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 733 )   73 - 76   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Belief Propagation decoding for Low-Density Parity-Check (LDPC) codes approximates bit-wise Maximum A posteriori Probability (MAP) decoding. LDPC codes with carefully designed degree distribution tend to have error floors in which error rate decrease slowly as SNR increases. The aim of this report is to lower error floors of LDPC codes. In error floor region, the number of error bits in decoding result blocks is small and some paticular error pertterns are frequently observed. We investigate these small errors and cycles associated with frequent error bits and present a decoding algorithm lowering error floors of LDPC codes.

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  • Design of LDPC codes using degree distributions of Tanner graphs

    MIYAMOTO Shinya, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 733 )   61 - 66   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Decoding performance of LDPC (Low-Density Parity-Check) codes over a binary erasure channel (BEC) is highly dependent on the degree distributions of the Tanner graphs. We compare two types of LDPC code ensembles having uniform degree distributions and non-uniform ones respectively. Then we provide a sufficient condition for the erasure probability of a BEC for which the decoding performance for the ensembles with uniform degree distributions is superior to that with non-uniform ones.

    CiNii Books

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  • LDPC 符号のエラーフロアの解消

    市川知行, 笠井健太, 坂庭好一

    電子情報通信学会技術研究報告. IT, 情報理論   104 ( 729 )   73 - 76   2005.3

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    Publisher：社団法人電子情報通信学会  

    Low-Density Parity-Check(LDPC)符号の復号法として知られるBeleif Propagation(BP)は、ビット毎の最大事後確率(MAP)復号を近似する復号法である。低密度パリティ検査(LDPC)符号は、BP復号によって理論限界に近い復号性能を持つことが知られているが、そのSNR対誤り率復号性能曲線では、高いSNRで誤り率の低下が鈍るエラーフロアと呼ばれる領域が存在する。本研究の目的はこのエラーフロア領域を解消することである。エラーフロア領域において、度々復号に失敗する伝送ビットに対応するタナーグラフ上の変数ノードが成す部分グラフには、短いサイクルが存在する傾向がある。このサイクルに対して部分的なMAP復号を実現する復号アルゴリズムを提案し、エラーフロアが緩和された例を示す。

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  • Design of LDPC codes using degree distributions of Tanner graphs

    MIYAMOTO Shinya, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 729 )   61 - 66   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Decoding performance of LDPC (Low-Density Parity-Check) codes over a binary erasure channel (BEC) is highly dependent on the degree distributions of the Tanner graphs. We compare two types of LDPC code ensembles having uniform degree distributions and non-uniform ones respectively. Then we provide a sufficient condition for the erasure probability of a BEC for which the decoding performance for the ensembles with uniform degree distributions is superior to that with non-uniform ones.

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  • タナーグラフの次数分布を用いたLDPC符号の設計

    宮本 新也, 笠井 健太, 坂庭 好一

    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   104 ( 733 )   61 - 66   2005.3

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  • A Decoding Algorithm Lowering Error Floors of LDPC Codes

    ICHIKAWA Tomoyuki, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 729 )   73 - 76   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Belief Propagation decoding for Low-Density Parity-Check (LDPC) codes approximates bit-wise Maximum A posteriori Probability (MAP) decoding. LDPC codes with carefully designed degree distribution tend to have error floors in which error rate decrease slowly as SNR increases. The aim of this report is to lower error floors of LDPC codes. In error floor region, the number of error bits in decoding result blocks is small and some paticular error pertterns are frequently observed. We investigate these small errors and cycles associated with frequent error bits and present a decoding algorithm lowering error floors of LDPC codes.

    CiNii Books

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  • A Decoding Algorithm Lowering Error Floors of LDPC Codes

    ICHIKAWA Tomoyuki, KASAI Kenta, SAKANIWA Kohichi

    IEICE technical report. WBS, Wideband System   104 ( 733 )   73 - 76   2005.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Belief Propagation decoding for Low-Density Parity-Check (LDPC) codes approximates bit-wise Maximum A posteriori Probability (MAP) decoding. LDPC codes with carefully designed degree distribution tend to have error floors in which error rate decrease slowly as SNR increases. The aim of this report is to lower error floors of LDPC codes. In error floor region, the number of error bits in decoding result blocks is small and some paticular error pertterns are frequently observed. We investigate these small errors and cycles associated with frequent error bits and present a decoding algorithm lowering error floors of LDPC codes.

    CiNii Books

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  • タナーグラフの次数分布を用いたLDPC符号の設計

    宮本 新也, 笠井 健太, 坂庭 好一

    電子情報通信学会技術研究報告. ISEC, 情報セキュリティ   104 ( 731 )   61 - 66   2005.3

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  • タナーグラフの次数分布を用いたLDPC符号の設計

    宮本 新也, 笠井 健太, 坂庭 好一

    電子情報通信学会技術研究報告. IT, 情報理論   104 ( 729 )   61 - 66   2005.3

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  • A Code-Equivalent Transfomation Removing Cycles of Length Four in Tanner Graphs

    KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    IEICE Tech. Rep.   104 ( 302 )   25 - 28   2004.9

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Belief Propagation(BP) decoding is equivalent to Maximum a Posteriori(MAP) decoding when the Tanner graph of the code is free of cycles. Performance of BP decoding with Tanner graph with cycle is often not good if the Tanner graph has cycles of length four. Adding redundant parity-checks and puncturing bits, Yedidia et al. transformed high-density parity-check matrices to low-density ones. In this report, we investigate the transformation of parity-check matrices (or equivalently of Tanner graphs) removing cycles of length four in Tanner graphs, which is the special case of Yedidia's transformation. We prove that, when transmission over erasure channels, under the transformation, BP-recoverable erasures are preserved. We show transforming Tanner graph of (7,4,3) Hamming code makes some new BP-recoverable erasures.

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  • Concentration of the Decoding Performance for Detailedly Represented Irregular LDPC Code Ensembles

    SHIMADA Satoshi, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    Technical report of IEICE. ISEC   103 ( 715 )   121 - 126   2004.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Richardson et al. showed concentration of the performance of the BP decoder around its average performance in the regular and irregular LDPC code ensemble and that its average performance converges to the performance obtained by density evolution. Furthermore, Kasai et al. presented detailedly represented ensemble and its density evolution in order to look for ensembles which have better threshold than standard irregular ensembles. In this paper, we show concentration of the performance of the BP decoder around its average performance in the detailedly represented ensemble and that its average performance converges to the performance obtained by density evolution.

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  • Concentration of the Decoding Performance for Detailedly Represented Irregular LDPC Code Ensembles

    SHIMADA Satoshi, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    Technical report of IEICE. ISEC   103 ( 713 )   121 - 126   2004.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Richardson et al. showed concentration of the performance of the BP decoder around its average performance in the regular and irregular LDPC code ensemble and that its average performance converges to the performance obtained by density evolution. Furthermore, Kasai et al. presented detailedly represented ensemble and its density evolution in order to look for ensembles which have better threshold than standard irregular ensembles. In this paper, we show concentration of the performance of the BP decoder around its average performance in the detailedly represented ensemble and that its average performance converges to the performance obtained by density evolution.

    CiNii Books

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  • Concentration of the Decoding Performance for Detailedly Represented Irregular LDPC Code Ensembles

    SHIMADA Satoshi, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    Technical report of IEICE. ISEC   103 ( 711 )   121 - 126   2004.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Richardson et al. showed concentration of the performance of the BP decoder around its average performance in the regular and irregular LDPC code ensemble and that its average performance converges to the performance obtained by density evolution. Furthermore, Kasai et al. presented detailedly represented ensemble and its density evolution in order to look for ensembles which have better threshold than standard irregular ensembles. In this paper, we show concentration of the performance of the BP decoder around its average performance in the detailedly represented ensemble and that its average performance converges to the performance obtained by density evolution.

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  • SA-5-4 Stability of Density Evolution for Detailedly Represented Irregular LDPC Codes

    Kasai Kenta, Miyakawa Satoshi, Shibuya Tomoharu, Sakaniwa Kohichi

    Proceedings of the IEICE General Conference   2004   "S - 27"   2004.3

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    CiNii Books

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  • Weight Distributions of LDPC Codes with Tripartite Graphs

    SHIMOYAMA Yuji, IKEGAYA Ryoji, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    27 ( 1 )   9 - 12   2004

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    Language：Japanese  

    CiNii Books

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  • Asymptotic Analysis of Weight Distribution for Detailedly Represented Irregular LDPC Code Ensembles

    IKEGAYA Ryoji, KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    IEICE technical report. Information theory   103 ( 215 )   19 - 24   2003.7

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    Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Burshtein and Miller provided an asymptotic estimation of the exponent of the average weight distribution for conventional irregular LDPC ensembles defined by Richardson et al., which are based on bipartite graphs. This estimation is derived by the asymptotic estimation of the exponent of a coefficient in multinomials with non-negative coefficients. In this paper, we employ Burshtein's method to provide an asymptotic estimation of the exponent of the average weight distribution for detailedly represented irregular LDPC ensembles. Moreover, we present numerical examples which show the relation between the exponent of the average weight distribution for conventional and detailedly represented ensemble, and provide an example of code ensemble which has larger typical minimum distance than given conventional ensemble has.

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  • 詳細に表現された非正則LDPC符号に関する密度発展法(モバイル環境におけるPerson to person高信頼性情報流通技術)(情報通信サブソサイエティ合同研究会)

    笠井健太, 渋谷智治, 坂庭好一

    電子情報通信学会技術研究報告. ITS   102 ( 747 )   149 - 154   2003.3

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    Publisher：社団法人電子情報通信学会  

    著者らによって、低密度パリティ検査符号に関する従来のアンサンブルC(n,λ,ρ)をより詳細に表現したアンサンブルC_l(n,π)が提案され、そのアンサンブルに関する密度発展法が開発されている。しかし、その導出にはある命題の成立を仮定しており、その命題の成立は実験によって支持されているにすぎなかった。本報告では、まずより単純な命題の成立を仮定することにより、C_1(n,π)に関する従来の密度発展法が得られる事を示す。さらに、C_2(n,π)⊂C_l(n,π)なるアンサンブルC_2(n,π)を提案し、いかなる命題を仮定することなく、C_2(n,π)に関する密度発展法が得られることを示す。

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  • Density Evolution for Detailedly Represented Irregular LDPC Codes

    KASAI Kenta, SHIBUYA Tomoharu, SAKANIWA Kohichi

    Technical report of IEICE. ISEC   102 ( 743 )   149 - 154   2003.3

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    Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

    We have proposed a low-density parity-check code ensemble C_1(η,π) and developed its density evolution. The density evolution for C_1(η,π) required a conjecture which was supported empirically. In this report we simplify the conjecture to derive the density evolution for C_1(η,π). Further, we propose a subensemble C_2(η,π) ⊂ C_1(η,π) whose density evolution does not require any conjecture.

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  • 詳細に表現された非正則LDPC符号に関する密度発展法(モバイル環境におけるPerson to person高信頼性情報流通技術 : 情報通信サブソサイエティ合同研究会)

    笠井健太, 渋谷智治, 坂庭好一

    電子情報通信学会技術研究報告. SST, スペクトル拡散   102 ( 745 )   149 - 154   2003.3

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    Publisher：社団法人電子情報通信学会  

    著者らによって、低密度パリティ検査符号に関する従来のアンサンブルC(n,λ,ρ)をより詳細に表現したアンサンブルC_1(n,π)が提案され、そのアンサンブルに関する密度発展法が開発されている。しかし、その導出にはある命題の成立を仮定しており、その命題の成立は実験によって支持されているにすぎなかった。本報告では、まずより単純な命題の成立を仮定することにより、C_1(n,π)に関する従来の密度発展法が得られる事を示す。さらに、C_2(n,π)⊂C_1(n,π)なるアンサンブルC_2(n,π)を提案し、いかなる命題を仮定することなく、C_2(n,π)に関する密度発展法が得られることを示す。

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  • 詳細に表現された非正則LDPC符号に関する密度発展法(モバイル環境におけるPerson to person高信頼性情報流通技術)(情報通信サブソサイエティ合同研究会)

    笠井健太, 渋谷智治, 坂庭好一

    電子情報通信学会技術研究報告. IT, 情報理論   102 ( 741 )   149 - 154   2003.3

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    Publisher：社団法人電子情報通信学会  

    著者らによって、低密度パリティ検査符号に関する従来のアンサンブルC(η,λ,ρ)をより詳細に表現したアンサンブルC_1(η,π)が提案され、そのアンサンブルに関する密度発展法か開発されている。しかし、その導出にはある命題の成立を仮定しており、その命題の成立は実験によって支持されているにすぎなかった。本報告では、まずより単純な命題の成立を仮定することにより、C_1(η,π)に関する従来の密度発展法か得られる事を示す。さらに、C_2(η,π)⊂C_1(η,π)なるアンサンブルC_2(η,π)を提案し、いかなる命題を仮定することなく、C_2(η,π)に関する密度発展法が得られることを示す。

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Presentations

  • Invited talk (title TBD) Invited International conference

    Kenta Kasai

    HQI (Harvard)–FQSP (RIKEN) 3rd Workshop 2026  2026.12 

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    Venue：RIKEN, Wako, Saitama, Japan  

    Invited talk in December 2026. Exact presentation date, time, and title TBD.

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  • Ultra-High-Rate Quantum LDPC Codes Invited International conference

    Kenta Kasai

    Frontiers in Scaling Superconducting Quantum Computing  2026.10 

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    Venue：Riva del Garda, Italy  

    Invited talk. Presentation time TBD. Presentation date: October 23, 2026.

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  • Ultra-High-Rate Quantum LDPC Codes Invited

    Kenta Kasai

    NVIDIA Quantum Seminar Series  2026.10  NVIDIA

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    Event date： 2026.10

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Online (Microsoft Teams)  

    Invited online seminar for NVIDIA's quantum group. Held at 1:00 AM JST on October 14, 2026 (5:00 PM BST on October 13, 2026).

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  • Pair-Partition Quantum LDPC Codes: Construction and Distance Verification Invited

    Kenta Kasai

    49th RQC Colloquium  2026.10 

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    Venue：Hybrid: Zoom and Large Meeting Room, 2F, Welfare and Conference Building, RIKEN Wako Campus  

    Invited talk. Wednesday, October 14, 2026, 16:00–17:00 JST. Hybrid event.

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  • Invited talk (title TBD) Invited International conference

    Kenta Kasai

    Workshop on Quantum Error Correction (QEC)  2026.10 

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    Venue：CWI, Amsterdam, the Netherlands  

    Invited talk in October 2026. Exact presentation date, time, and title TBD.

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  • Quantum LDPC Codes Beyond the Orthogonality Barrier: High Girth, Short Block Lengths, and Certified Distance Invited International conference

    Kenta Kasai

    YITP Workshop "Frontiers in Theory of Quantum Fault-Tolerant Technologies"  2026.9 

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    Venue：Kyoto  

    Invited talk at the Yukawa Institute for Theoretical Physics (YITP), Kyoto University.

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  • Quantum LDPC Codes Beyond the Orthogonality Barrier: High Girth, Short Block Lengths, and Certified Distance Invited

    Kenta Kasai

    LGE Quantum Journal Club  2026.8 

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  • Recent Advances in the Design of High-Girth qLDPC Codes Invited International conference

    Kenta Kasai

    Leidos Webinar  2026.7  Leidos

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    Presentation type：Oral presentation (invited, special)  

    Venue：Online  

    Invited webinar. Presentation: July 20, 2026, 22:30–23:00 JST (09:30–10:00 EDT).

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  • Advancing Quantum LDPC Codes with Classical LDPC Design Principles Invited International conference

    Kenta Kasai

    Quantum Information and Dynamics 2026 (QID2026)  2026.7 

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    Venue：Seoul  

    Invited talk. Presentation: July 7, 2026, 10:00–11:00 KST/JST.

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  • Breaking the Orthogonality Barrier in Quantum LDPC Codes Invited

    Kenta Kasai

    BlocQ Seminar  2026.6 

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    Event date： 2026.6

    Presentation type：Oral presentation (invited, special)  

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  • Breaking the Orthogonality Barrier in Quantum LDPC Codes Invited

    Kenta Kasai

    Xanadu Code Construction Team Seminar  2026.6 

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    Event date： 2026.6

    Presentation type：Oral presentation (invited, special)  

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  • Breaking the Orthogonality Barrier in Quantum LDPC Codes Invited

    Kenta Kasai

    Google Quantum AI QCS Seminar  2026.6 

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    Event date： 2026.6

    Presentation type：Oral presentation (invited, special)  

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  • Breaking the Orthogonality Barrier in Quantum LDPC Codes Invited

    Kenta Kasai

    Oratomic Seminar  2026.6 

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    Event date： 2026.6

    Presentation type：Oral presentation (invited, special)  

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  • High-Rate Large-Girth Quantum LDPC Codes: Construction and Decoding Performance

    Kenta Kasai

    2026.5 

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    Presentation type：Oral presentation (general)  

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  • Bringing Classical LDPC Design Principles to Quantum LDPC Codes Invited

    Kenta Kasai

    MIT QEC Meeting  2026.5 

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    Event date： 2026.5

    Presentation type：Oral presentation (invited, special)  

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  • Bringing Classical LDPC Design Principles to Quantum LDPC Codes Invited

    Kenta Kasai

    Harvard Quantum Colloquium  2026.5 

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    Event date： 2026.5

    Presentation type：Oral presentation (invited, special)  

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  • Breaking the Orthogonality Barrier in Quantum LDPC Codes Invited

    Kenta Kasai

    QuEra QEC Team Seminar  2026.5 

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    Event date： 2026.5

    Presentation type：Oral presentation (invited, special)  

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  • Breaking the Orthogonality Barrier: Large-Girth Regular LDPC Structures with Favorable Distance for Quantum Error Correction Invited

    Kenta Kasai

    Information Theory and Applications (ITA) Workshop 2026  2026.2 

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    Event date： 2026.2

    Presentation type：Oral presentation (invited, special)  

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  • LDPC-CSS符号におけるパリティ検査行列の局所的改変手法の検討

    岡田好希, 笠井健太

    第53回量子情報技術研究会（QIT53）  2025.12 

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    Presentation type：Poster presentation  

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  • GPUを用いた多元LDPC符号に基づくCSS符号の同時BP復号器の実装に関する研究

    永松涼介, 笠井健太

    第53回量子情報技術研究会（QIT53）  2025.12 

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    Presentation type：Poster presentation  

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  • 多元LDPC符号に基づくLDPC-CSS符号の大規模化に適したスケーラブルなパリティ検査行列設計法

    内山陽司, 笠井健太

    第53回量子情報技術研究会（QIT53）  2025.12 

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    Presentation type：Poster presentation  

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  • The Many Applications of Spatially-Coupled Codes Invited

    Kenta Kasai

    IEEE Information Theory Workshop (ITW 2011)  2011.10 

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    Event date： 2011.10

    Presentation type：Oral presentation (invited, special)  

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  • EBP Analysis of Spatially Coupled ARA Codes Invited

    Hironori Uchikawa, Kenta Kasai, Kohichi Sakaniwa

    Information Theory and Applications (ITA) Workshop  2011.2 

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    Event date： 2011.2

    Presentation type：Oral presentation (invited, special)  

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  • Spatial Coupling of Capacity-Achieving Codes under MAP Decoding with Bounded Density Invited

    Kenta Kasai, Kohichi Sakaniwa

    Information Theory and Applications (ITA) Workshop  2011.2 

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    Event date： 2011.2

    Presentation type：Oral presentation (invited, special)  

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Research Projects

  • 理論限界に接近する大規模で高性能な量子誤り訂正符号の設計と解析

    Grant number：26K07504  2026.4 - 2029.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    笠井 健太

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    Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

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Academic Activities

  • Reviewer (ITCS 2027)

    Role(s)： Review, evaluation,　Peer review

    18th Innovations in Theoretical Computer Science Conference (ITCS 2027)  2026.9 - 2026.10

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    Type：Peer review 

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  • Reviewer, IEEE Information Theory Workshop (ITW 2026)

    Role(s)： Review, evaluation

    2026 IEEE Information Theory Workshop (ITW 2026)  2026.6

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    Type：Peer review 

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  • Reviewer, IEEE International Symposium on Information Theory (ISIT 2026)

    Role(s)： Review, evaluation

    2026 IEEE International Symposium on Information Theory (ISIT 2026)  2026.3

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    Type：Peer review 

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  • Reviewer (Quantum)

    Role(s)： Review, evaluation,　Peer review

    Quantum  2026

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2026.

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  • Session Chair, Quantum Error Correction 2

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

    2025 13th International Symposium on Topics in Coding (ISTC 2025)  2025.8

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    Type：Competition, symposium, etc. 

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  • Session Chair, Quantum Error Correction Code Constructions

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

    2025 IEEE International Symposium on Information Theory (ISIT 2025)  2025.6

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    Type：Competition, symposium, etc. 

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  • Reviewer (ISITA 2024)

    Role(s)： Review, evaluation,　Peer review

    2024 International Symposium on Information Theory and Its Applications (ISITA 2024)  2024.7

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    Type：Peer review 

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  • Reviewer (ISIT 2018)

    Role(s)： Review, evaluation,　Peer review

    2018 IEEE International Symposium on Information Theory (ISIT 2018)  2018.2

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    Type：Peer review 

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  • Reviewer (ISITA 2016)

    Role(s)： Review, evaluation,　Peer review

    2016 International Symposium on Information Theory and Its Applications (ISITA 2016)  2016.5 - 2016.6

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    Type：Peer review 

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  • Reviewer (ISIT 2016)

    Role(s)： Review, evaluation,　Peer review

    2016 IEEE International Symposium on Information Theory (ISIT 2016)  2016.3

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    Type：Peer review 

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  • Reviewer (IEEE Journal on Selected Areas in Communications)

    Role(s)： Review, evaluation,　Peer review

    IEEE Journal on Selected Areas in Communications  2015

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    Type：Peer review 

    Peer review for the special issue "Recent Advances in Capacity Approaching Codes".
    Review years: 2015.

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  • Reviewer (ISITA 2012)

    Role(s)： Review, evaluation,　Peer review

    2012 International Symposium on Information Theory and Its Applications (ISITA 2012)  2012.6

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    Type：Peer review 

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  • Reviewer (IEICE Electronics Express)

    Role(s)： Review, evaluation,　Peer review

    IEICE Electronics Express  2012

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2012.

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  • Reviewer (IEICE Transactions on Fundamentals, Japanese Edition)

    Role(s)： Review, evaluation,　Peer review

    IEICE Transactions on Fundamentals, Japanese Edition  2012

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2012.

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  • Reviewer (IEEE Transactions on Wireless Communications)

    Role(s)： Review, evaluation,　Peer review

    IEEE Transactions on Wireless Communications  2011

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2011.

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  • Reviewer (ISITA 2010)

    Role(s)： Review, evaluation,　Peer review

    2010 International Symposium on Information Theory and Its Applications (ISITA 2010)  2010.5

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    Type：Peer review 

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  • Reviewer (ISIT 2010)

    Role(s)： Review, evaluation,　Peer review

    2010 IEEE International Symposium on Information Theory (ISIT 2010)  2010.2

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    Type：Peer review 

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  • Reviewer (IEEE Photonics Journal)

    Role(s)： Review, evaluation,　Peer review

    IEEE Photonics Journal  2010

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2010.

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  • Reviewer (IEEE Wireless Communications Letters)

    Role(s)： Review, evaluation,　Peer review

    IEEE Wireless Communications Letters 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2012, 2026.

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  • Reviewer (IEICE Transactions on Fundamentals)

    Role(s)： Review, evaluation,　Peer review

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2007, 2008, 2009, 2010, 2011, 2012, 2016, 2017, 2018, 2024.

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  • Reviewer (IEICE Transactions on Communications)

    Role(s)： Review, evaluation,　Peer review

    IEICE Transactions on Communications 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2007, 2008, 2009, 2010, 2011, 2012, 2017.

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  • Reviewer (IEEE Communications Letters)

    Role(s)： Review, evaluation,　Peer review

    IEEE Communications Letters 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2008, 2010, 2011, 2012, 2013, 2015, 2026.

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  • Reviewer (IEEE Transactions on Communications)

    Role(s)： Review, evaluation,　Peer review

    IEEE Transactions on Communications 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2010, 2011, 2012, 2013, 2015.

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  • Reviewer (IEEE Transactions on Information Theory)

    Role(s)： Review, evaluation,　Peer review

    IEEE Transactions on Information Theory 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2011, 2015, 2026.

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  • Reviewer (IEICE Transactions on Communications, Japanese Edition)

    Role(s)： Review, evaluation,　Peer review

    IEICE Transactions on Communications, Japanese Edition 

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    Type：Peer review 

    Peer review of submitted manuscripts.
    Review years: 2011, 2017.

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