Kohichi SAKANIWA


Message Passing Decoder with Decoding on Zigzag Cycles for Non-binary LDPC Codes
Takayuki NOZAKI Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/04/01
Vol. E97-A  No. 4  pp. 975-984
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
non-binary LDPC codeerror floormemoryless binary-input output-symmetricbelief propagation decodermaximum a posteriori decoding
 Summary | Full Text:PDF(683.9KB)

Weight Distribution for Non-binary Cluster LDPC Code Ensemble
Takayuki NOZAKI Masaki MAEHARA Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2382-2390
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
non-binary cluster LDPC codeweight distributionexponential growth rate
 Summary | Full Text:PDF(1.2MB)

Simple Nonbinary Coding Strategy for Very Noisy Relay Channels
Puripong SUTHISOPAPAN Kenta KASAI Anupap MEESOMBOON Virasit IMTAWIL Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/12/01
Vol. E95-A  No. 12  pp. 2122-2129
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
nonbinary LDPC codemultiplicative repetitiondecode-and-forwardhalf duplex relayingrelay channelvery noisy relay channel
 Summary | Full Text:PDF(1.4MB)

Analysis of Error Floors for Non-binary LDPC Codes over General Linear Group through q-Ary Memoryless Symmetric Channels
Takayuki NOZAKI Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/12/01
Vol. E95-A  No. 12  pp. 2113-2121
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
non-binary LDPC codeerror floorq-ary memoryless symmetric channelbelief propagation
 Summary | Full Text:PDF(639.7KB)

Analysis of Error Floors of Non-binary LDPC Codes over BEC
Takayuki NOZAKI Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/01/01
Vol. E95-A  No. 1  pp. 381-390
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
non-binary LDPC codeserror floorsbelief propagation
 Summary | Full Text:PDF(792.9KB)

Analysis of Error Floors of Non-binary LDPC Codes over MBIOS Channel
Takayuki NOZAKI Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2144-2152
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
non-binary LDPC codeerror floorMBIOS channel
 Summary | Full Text:PDF(740.7KB)

Spatially-Coupled MacKay-Neal Codes and Hsu-Anastasopoulos Codes
Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2161-2168
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
spatial couplingLDPC codeiterative decoding
 Summary | Full Text:PDF(1.1MB)

Design and Performance of Rate-Compatible Non-binary LDPC Convolutional Codes
Hironori UCHIKAWA Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2135-2143
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
non-binary LDPC codesLDPC convolutional codesrate-compatibility
 Summary | Full Text:PDF(1.4MB)

Analysis of Stopping Constellation Distribution for Irregular Non-binary LDPC Code Ensemble
Takayuki NOZAKI Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2153-2160
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
non-binary LDPC codesstopping constellation
 Summary | Full Text:PDF(723.8KB)

Spatially Coupled Protograph-Based LDPC Codes for Decode-and-Forward in Erasure Relay Channel
Hironori UCHIKAWA Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2127-2134
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
spatially coupled codesprotograph-based LDPC codesrelayerasure channel
 Summary | Full Text:PDF(510.2KB)

Weight Distributions of Non-binary LDPC Codes
Kenta KASAI Charly POULLIAT David DECLERCQ Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/04/01
Vol. E94-A  No. 4  pp. 1106-1115
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
non-binary low-density parity-check codeweight distributionGalois fields
 Summary | Full Text:PDF(695.5KB)

Weight Distributions of Multi-Edge Type LDPC Codes
Kenta KASAI Tomoharu AWANO David DECLERCQ Charly POULLIAT Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 1942-1948
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
low-density parity-check codestructured codesweight distributions
 Summary | Full Text:PDF(708.6KB)

Fourier Domain Decoding Algorithm of Non-binary LDPC Codes for Parallel Implementation
Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 1949-1957
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
LDPC codenon-binary LDPC codesbelief propagationGalois fielditerative decoding
 Summary | Full Text:PDF(258.9KB)

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
 Summary | Full Text:PDF(276.3KB)

An Edge-Preserving Super-Precision for Simultaneous Enhancement of Spacial and Grayscale Resolutions
Hiroshi HASEGAWA Toshinori OHTSUKA Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/02/01
Vol. E91-A  No. 2  pp. 673-681
Type of Manuscript:  PAPER
Category: Image
Keyword: 
super-resolutionHuber functiontotal variationset-theoretic approachouter approximationhybrid steepest descent method
 Summary | Full Text:PDF(2MB)

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
 Summary | Full Text:PDF(286.3KB)

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
 Summary | Full Text:PDF(306.7KB)

Sufficient Conditions for a Regular LDPC Code Better than an Irregular LDPC Code
Shinya MIYAMOTO Kenta KASAI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/02/01
Vol. E90-A  No. 2  pp. 531-534
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
Low-Density Parity-Check codesDensity EvolutionBECBelief PropagationBSCGallager's algorithm
 Summary | Full Text:PDF(117.9KB)

Fast Acquisition of PN Sequences in DS-CDMA Systems with Incoherent Demodulator
Sergei BYCHENKOV Vladimir MIKHAILOV Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/12/01
Vol. E89-B  No. 12  pp. 3319-3334
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
fast acquisitionPN sequencedecomposition of sequencescomponent sequenceDS-CDMA
 Summary | Full Text:PDF(453KB)

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)

Some Classes of Quasi-Cyclic LDPC Codes: Properties and Efficient Encoding Method
Hachiro FUJITA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/12/01
Vol. E88-A  No. 12  pp. 3627-3635
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
quasi-cyclic codesarray codesLDPC codesencoderdivision circuitSFT codesFossorier codes
 Summary | Full Text:PDF(252.1KB)

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)

Justesen-Type Modified Expander Codes and Their Decoding Algorithm
Hachiro FUJITA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2708-2714
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
expander codesJustesen codesZyablov boundGMD decoding
 Summary | Full Text:PDF(193.8KB)

An Iterative MPEG Super-Resolution with an Outer Approximation of Framewise Quantization Constraint
Hiroshi HASEGAWA Toshiyuki ONO Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/09/01
Vol. E88-A  No. 9  pp. 2427-2435
Type of Manuscript:  PAPER
Category: Image
Keyword: 
super-resolutionMPEG videoset-theoretic approachouter approximationadaptive projected subgradient method
 Summary | Full Text:PDF(885.3KB)

A Subspace Blind Identification Algorithm with Reduced Computational Complexity--Colored Noise Case--
Nari TANABE Toshihiro FURUKAWA Kohichi SAKANIWA Shigeo TSUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/07/01
Vol. E88-A  No. 7  pp. 2015-2018
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
principal component analysissubspace methodcolored observation noisenoise variancechannel ordercomputational complexity
 Summary | Full Text:PDF(264.6KB)

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)

A Practical Subspace Blind Identification Algorithm with Reduced Computational Complexity
Nari TANABE Toshihiro FURUKAWA Kohichi SAKANIWA Shigeo TSUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/12/01
Vol. E87-A  No. 12  pp. 3360-3371
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
principal component analysisautocorrelationsubspace methodeigenvalue and singular-value decompositioncomputational complexitychannel ordernoise variance
 Summary | Full Text:PDF(1.3MB)

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)

A Fast Blind Multiple Access Interference Reduction in DS/CDMA Systems Based on Adaptive Projected Subgradient Method
Renato L. G. CAVALCANTE Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/08/01
Vol. E87-A  No. 8  pp. 1973-1980
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Signal Processing for Communications
Keyword: 
DS/CDMAmultiple access interference (MAI)adaptive projected subgradient methodinterference suppressionblind detection
 Summary | Full Text:PDF(459.1KB)

Discrete Time-Frequency Projection Filtering Based on an Alias-Free Discrete Time-Frequency Analysis
Hiroshi HASEGAWA Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/06/01
Vol. E87-A  No. 6  pp. 1537-1545
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
time-frequency analysisCohen's classdiscrete time and frequencylinear time-varying filtering
 Summary | Full Text:PDF(671.8KB)

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)

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)

A Note on Robust Adaptive Volterra Filtering Based on Parallel Subgradient Projection Techniques
Isao YAMADA Takuya OKADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/08/01
Vol. E86-A  No. 8  pp. 2065-2068
Type of Manuscript:  Special Section LETTER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
nonlinear identificationadaptive filteringsecond order Volterra systemparallel subgradient projection
 Summary | Full Text:PDF(416.3KB)

A Truncated Polynomial Interpolation and Its Application to Polynomially WLS Design of IIR Filters
Hiroshi HASEGAWA Masashi NAKAGAWA Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/07/01
Vol. E86-A  No. 7  pp. 1742-1748
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
Walsh's theoremweighted least-squares approximationrational approximationdesign of IIR filters
 Summary | Full Text:PDF(426.4KB)

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)

Fast Acquisition of PN Sequences in DS/CDMA Systems
Sergei BYCHENKOV Vladimir MIKHAILOV Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/11/01
Vol. E85-A  No. 11  pp. 2498-2520
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
fast acquisitionPN sequencedecomposition of sequencescomponent sequenceDS/CDMA
 Summary | Full Text:PDF(758KB)

A Higher Order Generalization of an Alias-Free Discrete Time-Frequency Analysis
Hiroshi HASEGAWA Yasuhiro MIKI Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/08/01
Vol. E85-A  No. 8  pp. 1774-1780
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Theory of Signals
Keyword: 
time-frequency analysishigher order moment spectradiscrete-time & frequencykernel designhybrid steepest descent method
 Summary | Full Text:PDF(476.1KB)

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)

Fast Encoding of Algebraic Geometry Codes
Ryutaroh MATSUMOTO Masakuni OISHI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/10/01
Vol. E84-A  No. 10  pp. 2514-2517
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
encoderone-point algebraic geometry code
 Summary | Full Text:PDF(158KB)

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 Design of Near Perfect Reconstruction Linear-Phase QMF Banks Based on Hybrid Steepest Descent Method
Hiroshi HASEGAWA Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/08/25
Vol. E83-A  No. 8  pp. 1523-1530
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Filter Banks
Keyword: 
two-channel linear phase FIR QMF banknear perfect reconstructionconvex projection techniquehybrid steepest descent methodmagnitude product space
 Summary | Full Text:PDF(716.7KB)

A Simple Nonlinear Pre-Filtering for a Set-Theoretic Linear Blind Deconvolution Scheme
Masanori KATO Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/08/25
Vol. E83-A  No. 8  pp. 1651-1653
Type of Manuscript:  Special Section LETTER (Special Section on Digital Signal Processing)
Category: Multidimensional Signal Processing
Keyword: 
blind image deconvolutionrestoration filterhybrid steepest descent methodnonlinear pre-filteringε-filter
 Summary | Full Text:PDF(596.7KB)

An Associative Memory Neural Network to Recall Nearest Pattern from Input
Isao YAMADA Satoshi IINO Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/12/25
Vol. E82-A  No. 12  pp. 2811-2817
Type of Manuscript:  PAPER
Category: Neural Networks
Keyword: 
associative memoryneural networkdual coneDykstra's algorithmfixed point theorem for nonexpansive mappings
 Summary | Full Text:PDF(643.8KB)

FOREWORD
Akira OGAWA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 1997-1997
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(185.4KB)

A Set-Theoretic Blind Image Deconvolution Based on Hybrid Steepest Descent Method
Masanori KATO Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/08/25
Vol. E82-A  No. 8  pp. 1443-1449
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
blind image restorationblind image deconvolutionconvex projectionhybrid steepest descent method
 Summary | Full Text:PDF(1.2MB)

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)

FOREWORD
Masayuki TANIMOTO Kohichi SAKANIWA Kiyoharu AIZAWA Kazuyoshi OSHIMA Kiyomi KUMOZAKI Shuji TASAKA Yoichi MAEDA Takeshi MIZUIKE Mikio YAMASHITA Hideaki YAMANAKA Koichiro WAKASUGI Masaaki KATAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/12/25
Vol. E81-B  No. 12  pp. 2253-2256
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
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Improvement of Extended Symbol-Aided Estimation for Rayleigh Fading Channels
Kazunari GENKO Le-Hai NAM Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/10/25
Vol. E81-A  No. 10  pp. 2073-2082
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Spread Spectrum System
Keyword: 
fading channelsfading estimationpilot symbolsymbol-aided estimation
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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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A Note on Constrained Least Squares Design of M-D FIR Filter Based on Convex Projection Techniques
Isao YAMADA Hiroshi HASEGAWA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/08/25
Vol. E81-A  No. 8  pp. 1586-1591
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
multidimensional FIR filter constrained least squares designconvex projection Dykstra's algorithm
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An Analysis of a 16QAM System Using Extended Symbol-Aided Estimation under Rician Fading Channels
Le-Hai NAM Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/06/25
Vol. E81-A  No. 6  pp. 1276-1283
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
Rician fading16QAMpilot symbolfading estimationextended symbol-aided estimation
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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
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Extended Symbol-Aided Estimation for Non-selective Rayleigh Fading Channels
Le-Hai NAM Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2144-2154
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communications/Coded Modulation/Spread Spectrum
Keyword: 
fading channelspilot symbolfading estimationsymbol-aided estimation
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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
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A Fast Neural Network Learning with Guaranteed Convergence to Zero System Error
Teruo AJIMURA Isao YAMADA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/09/25
Vol. E79-A  No. 9  pp. 1433-1439
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Stochastic Process/Learning
Keyword: 
neural networklocal minimumdimension expansionzero system error
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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
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A Decoding Algorithm and Some Properties of Böinck and Tilborg's t-EC/AUED Code
Kenji YOSHIDA Hajime JINUSHI Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1993/09/25
Vol. E76-A  No. 9  pp. 1535-1536
Type of Manuscript:  LETTER
Category: Information Theory and Coding Theory
Keyword: 
t-EC/AUED codessymumetric errorunidirectional errorburst-errordecoding algorithm
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Effect of Asymmetric Error Correcting Codes in Photon Communication Systems
Tomohiko UYEMATSU Kouichi YAMAZAKI Osamu HIROTA Masao NAKAGAWA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1988/09/25
Vol. E71-E  No. 9  pp. 850-857
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
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On Classes of Novel Quantum State for Attenuation Process
Tomohiko UYEMATSU Osamu HIROTA Kohichi SAKANIWA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1987/04/25
Vol. E70-E  No. 4  pp. 385-388
Type of Manuscript:  LETTER
Category: Optical Communication
Keyword: 
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A Design Method for Transversal Filters with Nonuniform Tap Spacings Based on the Mean Square Error Criterion
Tomohiko UYEMATSU Kohichi SAKANIWA Genya KISHI 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1985/05/25
Vol. E68-E  No. 5  pp. 341-342
Type of Manuscript:  LETTER
Category: Circuit Theory
Keyword: 
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