Shinji TSUZUKI received the B.E. and M.E. degrees in electronics engineering from Ehime University (Japan) in 1983 and 1985, respectively, and the Doctorate degree in engineering from Kyoto University (Japan) in 1999. He joined Sumitomo Electric Ind. Ltd. in 1985. He was engaged in the research and development of Fiberoptic Local Area Network systems. Since 1991 he has been in the Faculty of Engineering of Ehime University, where he is currently an Associate Professor. During 1996-1997 he was a visiting scholar at Kyoto University. His research interests include power-line communication (PLC), spread spectrum (SS) communication, and network access techniques. He is a member of IEICE (The Institute of Electronics Information and Communication Engineers, Japan), IEEJ(The Institute of Electrical Engineers of Japan), IPSJ(Information Processing Society of Japan),and IEEE.