Ken-ichi IWATA


Lossless Data Compression via Substring Enumeration for k-th Order Markov Sources with a Finite Alphabet
Ken-ichi IWATA Mitsuharu ARIMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/12/01
Vol. E99-A  No. 12  pp. 2130-2135
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Source Coding and Data Compression
Keyword: 
lossless data compressionuniversal source codingdata compression via substring enumerationk-th order Markov sourcesmaximum redundancy
 Summary | Full Text:PDF(350.8KB)

Evaluation of Maximum Redundancy of Data Compression via Substring Enumeration for k-th Order Markov Sources
Ken-ichi IWATA Mitsuharu ARIMURA Yuki SHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/08/01
Vol. E97-A  No. 8  pp. 1754-1760
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
lossless data compressionuniversal source codingdata compression via substring enumerationk-th order Markov sourcesmaximum redundancy
 Summary | Full Text:PDF(356.5KB)

A Characterization of Optimal FF Coding Rate Using a New Optimistically Optimal Code
Mitsuharu ARIMURA Hiroki KOGA Ken-ichi IWATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2443-2446
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Source Coding
Keyword: 
information spectrumgeneral sourceFF codeoptimistic achievable coding rate
 Summary | Full Text:PDF(92.1KB)

Redundancy-Optimal FF Codes for a General Source and Its Relationships to the Rate-Optimal FF Codes
Mitsuharu ARIMURA Hiroki KOGA Ken-ichi IWATA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2332-2342
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Source Coding
Keyword: 
fixed-to-fixed length source codinginformation-spectrum methodsgeneral sourcescoding rateredundancy
 Summary | Full Text:PDF(670.1KB)

Optimal Synthesis of a Class of 2-D Digital Filters with Minimum L2-Sensitivity and No Overflow Oscillations
Takao HINAMOTO Ken-ichi IWATA Osemekhian I. OMOIFO Shuichi OHNO Wu-Sheng LU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/07/01
Vol. E89-A  No. 7  pp. 1987-1994
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
L2-sensitivity minimizationL2-scaling constraintsno overflow oscillationsoptimal synthesisa class of 2-D state-space digital filters
 Summary | Full Text:PDF(343.6KB)

Information-Spectrum Characterization of Multiple-Access Channels with Correlated Sources
Ken-ichi IWATA Yasutada OOHAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/11/01
Vol. E88-A  No. 11  pp. 3196-3202
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
information spectrumjoint source-channel codingmultiple-access channel with correlated sources
 Summary | Full Text:PDF(213.3KB)

Information-Spectrum Characterization of Broadcast Channel with General Source
Ken-ichi IWATA Yasutada OOHAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2808-2818
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Information Theory
Keyword: 
general sourcesgeneral broadcast channelsinformation spectrumjoint source-channel codingtransmissibilitycapacity regionmixed channel
 Summary | Full Text:PDF(300.3KB)

Channel Coding Algorithm Simulating the Random Coding
Ken-ichi IWATA Jun MURAMATSU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/06/01
Vol. E87-A  No. 6  pp. 1576-1582
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
channel codingrandom codingsimulated random coding algorithmchannel coding with random number generator
 Summary | Full Text:PDF(178KB)

An Information-Spectrum Approach to Rate-Distortion Function with Side Information
Ken-ichi IWATA Jun MURAMATSU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/06/01
Vol. E85-A  No. 6  pp. 1387-1395
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
rate-distortion with side informationinformation spectrumfixed-length codingmaximum distortion criterionmixed source
 Summary | Full Text:PDF(253.9KB)

A Simple Parallel Algorithm for the Ziv-Lempel Encoding
Ken-ichi IWATA Masakatu MORII Tomohiko UYEMATSU Eiji OKAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/04/25
Vol. E81-A  No. 4  pp. 709-712
Type of Manuscript:  LETTER
Category: Information Theory and Coding Theory
Keyword: 
parallel encodingsliding-window Ziv-Lempel algorithmlongest-matched stringuniversal data compression
 Summary | Full Text:PDF(300.2KB)

An Efficient Universal Coding Algorithm for Noiseless Channel with Symbols of Unequal Cost
Ken-ichi IWATA Masakatu MORII Tomohiko UYEMATSU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2232-2237
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Source Coding
Keyword: 
noiseless codingadditive cost of code symboluniversally optimal cost codingZiv-Lempel codingVarn coding
 Summary | Full Text:PDF(506.2KB)