Ken-ichi Iwata

Publication Activity (10 Years)

Years Active: 2002-2024
Publications (10 Years): 39

Top Topics

Dynamic Programming

Finite Alphabet

Error Correction

Shannon Entropy

Top Venues

IEICE Trans. Fundam. Electron. Commun. Comput. Sci.

Publications

Kengo Hashimoto, Ken-ichi Iwata
-Bit Delay Decodable Codes. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 107 (3) (2024)
Kengo Hashimoto, Ken-ichi Iwata
The Optimality of AIFV Codes in the Class of 2-bit Delay Decodable Codes. CoRR (2023)
Kengo Hashimoto, Ken-ichi Iwata
Properties of k-bit Delay Decodable Codes. CoRR (2023)
Kengo Hashimoto, Ken-ichi Iwata
Optimality of Huffman Code in the Class of 1-Bit Delay Decodable Codes. IEEE J. Sel. Areas Inf. Theory 3 (4) (2022)
Kengo Hashimoto, Ken-ichi Iwata
Optimality of Huffman Code in the Class of 1-bit Delay Decodable Codes. CoRR (2022)
Ken-ichi Iwata, Hirosuke Yamamoto
Joint Coding for Discrete Sources and Finite-State Noiseless Channels. ISIT (2022)
Ken-ichi Iwata, Hiroshi Kamabe
Foreword. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (3) (2022)
Ken-ichi Iwata, Hirosuke Yamamoto
AIVF Codes Based on Iterative Algorithm and Dynamic Programming. ISIT (2021)
Kengo Hashimoto, Ken-ichi Iwata
On the Optimality of Binary AIFV Codes with Two Code Trees. ISIT (2021)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Modular Arithmetic Erasure Channels and Their Multilevel Channel Polarization. IEEE Trans. Inf. Theory 66 (7) (2020)
Ryusei Fujita, Ken-ichi Iwata, Hirosuke Yamamoto
On a Redundancy of AIFV-m Codes for m =3, 5. ISIT (2020)
Ken-ichi Iwata, Hirosuke Yamamoto
An Algorithm for Constructing the Optimal Code Trees for Binary Alphabetic AIFV-m Codes. ITW (2020)
Hirosuke Yamamoto, Koki Imaeda, Kengo Hashimoto, Ken-ichi Iwata
A Universal Data Compression Scheme based on the AIVF Coding Techniques. ISIT (2020)
Ryusei Fujita, Ken-ichi Iwata, Hirosuke Yamamoto
An Iterative Algorithm to Optimize the Average Performance of Markov Chains with Finite States. ISIT (2019)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Countably Infinite Multilevel Source Polarization for Non-Stationary Erasure Distributions. ISIT (2019)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Countably Infinite Multilevel Source Polarization for Non-Stationary Erasure Distributions. CoRR (2019)
Kengo Hashimoto, Ken-ichi Iwata, Hirosuke Yamamoto
Enumeration and Coding of Compact Code Trees for Binary AIFV Codes. ISIT (2019)
Yuta Sakai, Ken-ichi Iwata
Dynamic Programming Approach of Optimal Upgradation Algorithm for an Auxiliary Random Variable of a Bernoulli Random Variable. ISIT (2018)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Asymptotic Distribution of Multilevel Channel Polarization for a Certain Class of Erasure Channels. CoRR (2018)
Yuta Sakai, Ken-ichi Iwata
for Ternary-Input Discrete Memoryless Channels. IEEE Trans. Inf. Theory 64 (1) (2018)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Modular Arithmetic Erasure Channels and Their Multilevel Channel Polarization. CoRR (2018)
Yuta Sakai, Ken-ichi Iwata, Hiroshi Fujisaki
Asymptotic Distribution of Multilevel Channel Polarization for a Certain Class of Erasure Channels. ISIT (2018)
Ryusei Fujita, Ken-ichi Iwata, Hirosuke Yamamoto
An Optimality Proof of the Iterative Algorithm for AIFV-m Codes. ISIT (2018)
Hirosuke Yamamoto, Ken-ichi Iwata
An iterative algorithm to construct optimal binary AIFV-m codes. ITW (2017)
Yuta Sakai, Ken-ichi Iwata
Sharp bounds on Arimoto's conditional Rényi entropies between two distinct orders. ISIT (2017)
Yuta Sakai, Ken-ichi Iwata
Optimal quantization of B-DMCs maximizing α-mutual information with monge property. ISIT (2017)
Yuta Sakai, Ken-ichi Iwata
Sharp Bounds on Arimoto's Conditional Rényi Entropies Between Two Distinct Orders. CoRR (2017)
Kees A. Schouhamer Immink, Stan Baggen, Ferdaous Chaabane, Yanling Chen, Peter H. N. de With, Héla Gassara, Hamed Gharbi, Adel Ghazel, Khaled Grati, Naira M. Grigoryan, Ashot N. Harutyunyan, Masayuki Imanishi, Mitsugu Iwamoto, Ken-ichi Iwata, Hiroshi Kamabe, Brian M. Kurkoski, Shigeaki Kuzuoka, Patrick Langenhuizen, Jan Lewandowsky, Akiko Manada, Shigeki Miyake, Hiroyoshi Morita, Jun Muramatsu, Safa Najjar, Arnak V. Poghosyan, Fatma Rouissi, Yuta Sakai, Ulrich Tamm, Joost van der Putten, Fons van der Sommen, A. J. Han Vinck, Tadashi Wadayama, Dirk Wübben, Hirosuke Yamamoto
Proceedings of Workshop AEW10: Concepts in Information Theory and Communications. CoRR (2017)
Yuta Sakai, Ken-ichi Iwata
A Generalized Erasure Channel in the Sense of Polarization for Binary Erasure Channels. CoRR (2016)
Yuta Sakai, Ken-ichi Iwata
-Norm. CoRR (2016)
Yuta Sakai, Ken-ichi Iwata
Sharp Bounds Between Two Rényi Entropies of Distinct Positive Orders. CoRR (2016)
Ken-ichi Iwata, Mitsuharu Arimura
-th Order Markov Sources with a Finite Alphabet. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2016)
Ken-ichi Iwata, Hirosuke Yamamoto
A dynamic programming algorithm to construct optimal code trees of AIFV codes. ISITA (2016)
Yuta Sakai, Ken-ichi Iwata
Relations between conditional Shannon entropy and expectation of ℓα-norm. ISIT (2016)
Yuta Sakai, Ken-ichi Iwata
A generalized erasure channel in the sense of polarization for binary erasure channels. ITW (2016)
Yuta Sakai, Ken-ichi Iwata
Extremal relations between shannon entropy and ℓα-norm. ISITA (2016)
Yuta Sakai, Ken-ichi Iwata
-Norm. CoRR (2016)
Ken-ichi Iwata, Mitsuharu Arimura
Lossless Data Compression via Substring Enumeration for k-th Order Markov Sources with a Finite Alphabet. DCC (2015)
Yuta Sakai, Ken-ichi Iwata
Feasible regions of symmetric capacity and Gallager's E0 function for ternary-input discrete memoryless channels. ISIT (2015)
Ken-ichi Iwata, Shin-ya Ozawa
Quantizer design for outputs of binary-input discrete memoryless channels using SMAWK algorithm. ISIT (2014)
Ken-ichi Iwata, Mitsuharu Arimura, Yuki Shima
-th Order Markov Sources. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (8) (2014)
Yuta Sakai, Ken-ichi Iwata
Suboptimal quantizer design for outputs of discrete memoryless channels with a finite-input alphabet. ISITA (2014)
Mitsuharu Arimura, Hiroki Koga, Ken-ichi Iwata
Redundancy-Optimal FF Codes for a General Source and Its Relationships to the Rate-Optimal FF Codes. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2013)
Mitsuharu Arimura, Hiroki Koga, Ken-ichi Iwata
A Characterization of Optimal FF Coding Rate Using a New Optimistically Optimal Code. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (12) (2013)
Mitsuharu Arimura, Ken-ichi Iwata
On variable-to-fixed length coding of a general source with infinite alphabet. ISITA (2012)
Ken-ichi Iwata, Mitsuharu Arimura, Yuki Shima
On the maximum redundancy of CSE for I.I.D. sources. ISITA (2012)
Hiroki Koga, Mitsuharu Arimura, Ken-ichi Iwata
Coding theorems on the worst-case redundancy of fixed-length coding for a general source. ISIT (2011)
Ken-ichi Iwata, Mitsuharu Arimura, Yuki Shima
An Improvement in Lossless Data Compression via Substring Enumeration. ACIS-ICIS (2011)
Ken-ichi Iwata, Takuya Koyama
A prefix-free coding for finite-state noiseless channels with small coding delay. ISITA (2010)
Mitsuharu Arimura, Ken-ichi Iwata
The minimum achievable redundancy rate of fixed-to-fixed length source codes for general sources. ISITA (2010)
Yuya Yamaguchi, Takashi Otsuki, Ken-ichi Iwata, Shuichi Itoh
An Effective Optimization of Reference Pixel Arrangement in the Lossless Coding for HDTV image. ACIS-ICIS (2010)
Mitsuharu Arimura, Ken-ichi Iwata
On the achievable redundancy rate of fixed length source code for general sources. ISIT (2010)
Takao Hinamoto, Ken-ichi Iwata, Osemekhian I. Omoifo, Shuichi Ohno, Wu-Sheng Lu
-Sensitivity and No Overflow Oscillations. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (7) (2006)
Takao Hinamoto, Ken-ichi Iwata, Wu-Sheng Lu
-scaling constraints. ICASSP (4) (2005)
Takao Hinamoto, Ken-ichi Iwata, Wu-Sheng Lu
-scaling constraints. ISCAS (3) (2005)
Ken-ichi Iwata, Yasutada Oohama
Information-Spectrum Characterization of Broadcast Channel with General Source. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (10) (2005)
Bo Zhao, Ken-ichi Iwata, Shuichi Itoh, Toshihiko Kato
A New Approach of DCA by using BWT. DCC (2005)
Ken-ichi Iwata
On multiple-access communication system for general correlated sources with an array of general independent channels. ISIT (2005)
Ken-ichi Iwata, Yasutada Oohama
Information-Spectrum Characterization of Multiple-Access Channels with Correlated Sources. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (11) (2005)
Ken-ichi Iwata, Jun Muramatsu
An Information-Spectrum Approach to Rate-Distortion Function with Side Information. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (6) (2002)