September 2016 Issue
Topics

Design and analysis of information and stochastic systems

Professor Tsutomu Kawabata
Department of Communication Engineering and Informatics, Graduate School of Informatics and Engineering.

"My research activities are dedicated to information theory in order to establish a mathematical basis for digital communications with priority on engineering feasibility of related technologies," says Tsutomu Kawabata. "The applications of this research is not restricted to electrical engineering but include the so-called BLAST method used for the search of DNA bases in the Human Genome Project in the 1990s."

Current projects being undertaken by Kawabata and colleagues include:
  1. The design and analysis of lossy and lossless data compressions [1,2]. The lossy data compression is used to find the rate distorton function, that is, trades-offs between compression rates and distortion.
  2. Applications of information theory to mobile communications for wireless LAN channel [3] and multiuser-user detection problem for a sparsely spread CDMA system [4].

The focus of the research being undertaken in collaboration with Neji Yuossef [3] is to statistically characterize capacity outage events in multi-antenna systems to "improve the performance and spectral efficiency of mobile radio links".

"UEC, Tokyo has a long history of research on information theory in Japan," explains Kawabata. "My laboratory is an excellent environment to study advanced information communication technologies based on the information theory."

References
  • [1] M.M. Rashid and T. Kawabata, Analysis of zero-redundancy estimator with a finite window for Markovian source, IEICE Trans. Fundamentals of Electronics, Communications, and Computer Sciences, vol.E88-A, no.10, 2819-2825, Oct.2005.
  • [2] J. Takeuchi, T. Kawabata, and A. Barron, Properties of Jeffereys Mixture for Markov Sources, IEEE Trans. Info. Theory, vol. 59, no.1, 438-457, Jan. 2013.
  • [3] R. Hicheri, G. Rafiq, T. Kawabata, M. Pätzold, and N Youssef, On the Statistical Properties of Capacity Outage Intervals in OSTBC-MIMO Rayleigh Fading Channels, IEEE Trans. on Wireless Communications, vol.15, 3547-3559, May 2016.
  • [4] K. Takeuchi, T. Tanaka, and T. Kawabata, Performance Improvement of Iteration Multiuser Detection for Large Sparsely Spread CDMA Systems by Spatial Coupling, IEEE Trans. Info. Theory, vol.61, no.4, 1768-1794, April 2015.
Further information

Tsutomu KAWABATA Laboratory
http://www.uec.ac.jp/eng/research/introduction/opal-ring/0000343.html

Design and analysis of information and stochastic systems
Open discussion between faculty and students of the Kawabata Lab., UEC Tokyo.