Tomoharu SHIBUYA


On a Characterization of a State of Rank-Modulation Scheme Over Multi-Cell Ranking by a Group Action
Tomoharu SHIBUYA Takeru SUDO 
Publication:   
Publication Date: 2017/12/01
Vol. E100-A  No. 12  pp. 2558-2571
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory and Techniques
Keyword: 
rank-modulationcoding for flash memoriesmulti-cell rankingpermutation matricesgroup action
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Single Error Correcting Quantum Codes for the Amplitude Damping Channel Based on Classical Codes over GF(7)
Keisuke KODAIRA Mihoko WADA Tomoharu SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/11/01
Vol. E97-A  No. 11  pp. 2247-2253
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
amplitude dampingquantum error correcting codeasymmetric channel
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Efficient Linear Time Encoding for LDPC Codes
Tomoharu SHIBUYA Kazuki KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/07/01
Vol. E97-A  No. 7  pp. 1556-1567
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
LDPC codesencoding of linear codesblock triangular matricesa system of linear equations
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On the Dependence of Error Performance of Spatially Coupled LDPC Codes on Their Design Parameters
Hiroyuki IHARA Tomoharu SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2447-2451
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
spatially coupled LDPC codesdensity evolutionBP thresholdMAP threshold
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Ring Theoretic Approach to Reversible Codes Based on Circulant Matrices
Tomoharu SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2121-2126
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
LDPC codesreversible codesencoding of linear codesJacobi methodcirculant matricesmessage-passing algorithm
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Characterization of Factor Graph by Mooij's Sufficient Condition for Convergence of the Sum-Product Algorithm
Tomoharu SHIBUYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 2083-2088
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
convergence of the sum-product algorithmfactor graphmessage-passingsum-product decodingLDPC codes
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Detailed Evolution of Degree Distributions in Residual Graphs with Joint Degree Distributions
Takayuki NOZAKI Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/10/01
Vol. E91-A  No. 10  pp. 2737-2744
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
detailedly represented irregular LDPC code ensemblesevolution of degree distributions in residual graphspeeling algorithmbinary erasure channel
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Average Bit Erasure Probability of Regular LDPC Code Ensembles under MAP Decoding over BEC
Takayuki ITSUI Kenta KASAI Ryoji IKEGAYA Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/09/01
Vol. E90-A  No. 9  pp. 1763-1771
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
regular LDPC code ensemblea-posteriori probability decodingbinary erasure channelEXIT functionshortened information functionsupport weight distribution
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Performance of Standard Irregular LDPC Codes under Maximum Likelihood Decoding
Ryoji IKEGAYA Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/07/01
Vol. E90-A  No. 7  pp. 1432-1443
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
low-density parity-check (LDPC) codemaximum-likelihood decodingstandard irregular LDPC code ensembleblock error probability
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Design of Irregular Repeat Accumulate Codes with Joint Degree Distributions
Kenta KASAI Shinya MIYAMOTO Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/11/01
Vol. E89-A  No. 11  pp. 3351-3354
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
irregular repeat accumulate codesjoint degree distributioniterative decodingdensity evolutionbelief propagation
 Summary | Full Text:PDF(121.3KB)

Average Coset Weight Distribution of Multi-Edge Type LDPC Code Ensembles
Kenta KASAI Yuji SHIMOYAMA Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/10/01
Vol. E89-A  No. 10  pp. 2519-2525
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
average coset weight distributionlow-density parity-check codesmulti-edge type low-density parity-check codessymmetryweight distribution
 Summary | Full Text:PDF(240.2KB)

Weight and Stopping Set Distributions of Two-Edge Type LDPC Code Ensembles
Ryoji IKEGAYA Kenta KASAI Yuji SHIMOYAMA Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2745-2761
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
two-edge type LDPC codeweight distributionstopping set distributionbelief propagationerror performance
 Summary | Full Text:PDF(462.9KB)

Iterative Decoding Based on the Concave-Convex Procedure
Tomoharu SHIBUYA Ken HARADA Ryosuke TOHYAMA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/05/01
Vol. E88-A  No. 5  pp. 1346-1364
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
concave-convex procedureiterative decodingBethe free energyLDPC codesbelief propagation
 Summary | Full Text:PDF(504.8KB)

Asymptotic Weight and Stopping Set Distributions for Detailedly Represented Irregular LDPC Code Ensembles
Ryoji IKEGAYA Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/10/01
Vol. E87-A  No. 10  pp. 2484-2492
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
weight distributionstopping set distributiondetailedly represented irregular LDPC code ensemble
 Summary | Full Text:PDF(387.3KB)

Performance of a Decoding Algorithm for LDPC Codes Based on the Concave-Convex Procedure
Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/10/01
Vol. E86-A  No. 10  pp. 2601-2606
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
LDPC codesiterative decodingbelief propagationconcave-convex procedureBethe free energy
 Summary | Full Text:PDF(251.9KB)

Detailedly Represented Irregular Low-Density Parity-Check Codes
Kenta KASAI Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/10/01
Vol. E86-A  No. 10  pp. 2435-2444
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
density evolutionirregular low-density parity-check codeslow-density parity-check codesbelief propagation
 Summary | Full Text:PDF(379.6KB)

On Tanner's Lower Bound for the Minimum Distance of Regular LDPC Codes Based on Combinatorial Designs
Tomoharu SHIBUYA Masatoshi ONIKUBO Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/10/01
Vol. E86-A  No. 10  pp. 2428-2434
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
LDPC codesthe minimum distance Tanner grapht-designSteiner system
 Summary | Full Text:PDF(275.6KB)

Construction of Cyclic Codes Suitable for Iterative Decoding via Generating Idempotents
Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/04/01
Vol. E86-A  No. 4  pp. 928-939
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
Tanner graphscyclic codesLDPC codessum-product algorithmiterative decoding
 Summary | Full Text:PDF(690.4KB)

A Note on a Lower Bound for Generalized Hamming Weights
Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/12/01
Vol. E84-A  No. 12  pp. 3138-3145
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
generalized Hamming weightwell-behavingcyclic codesgeneralized Griesmer boundBCH bound
 Summary | Full Text:PDF(271.2KB)

A Dual of Well-Behaving Type Designed Minimum Distance
Tomoharu SHIBUYA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/02/01
Vol. E84-A  No. 2  pp. 647-652
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
designed minimum distanceFeng-Rao boundorder boundgeneralized Hamming weightalgebraic geometry codes
 Summary | Full Text:PDF(244KB)

A Lower Bound for Generalized Hamming Weights and a Condition for t-th Rank MDS
Tomoharu SHIBUYA Ryo HASEGAWA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/06/25
Vol. E82-A  No. 6  pp. 1090-1101
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
generalized Hamming weightst-th rank MDSReed-Solomon codesReed-Muller codescodes on affine algebraic varietyAG codes on Cab
 Summary | Full Text:PDF(556.7KB)

On Generalized Hamming Weights of Codes Constructed on Affine Algebraic Varieties
Tomoharu SHIBUYA Jiro MIZUTANI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/10/25
Vol. E81-A  No. 10  pp. 1979-1989
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
generalized Hamming weightscodes on affine algebraic varietiescodes on CabGrobner basismonomial order
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Simple Estimation for the Dimension of Subfield Subcodes of AG Codes
Tomoharu SHIBUYA Ryutaroh MATSUMOTO Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2058-2065
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
algebraic geometric codedimension of subfield subcodeclass of algebraic curve Cab
 Summary | Full Text:PDF(538.9KB)

An Improved Bound for the Dimension of Subfield Subcodes
Tomoharu SHIBUYA Ryutaroh MATSUMOTO Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/05/25
Vol. E80-A  No. 5  pp. 876-880
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
dimension of subfield subcodeBCH codealgebraic geometric code
 Summary | Full Text:PDF(301.5KB)

On the Performance of Algebraic Geometric Codes
Tomoharu SHIBUYA Hajime JINUSHI Shinji MIURA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/06/25
Vol. E79-A  No. 6  pp. 928-937
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
algebraic geometric codeclass of algebraic curve CabFeng-Rao designed distanceBCH codeBCH bound
 Summary | Full Text:PDF(693.7KB)