Takehiko Kobayashi received the B.E., M.E., and PhD. degrees in electrical engineering from the University of Tokyo in 1978, 1980, and 1983. He joined Nippon Telegraph and Telephone in 1983 and was engaged in research on various wireless systems. He was a guest scientist at the National Bureau of Standards (now NIST) in Boulder, Colorado, U.S.A. from 1986 to 1987. Since 2001 he has been a professor at the Department of Information and Communication Engineering, Tokyo Denki University. He received the IEICE Best Paper Awards in 2001 and 2001, the IEICE Achievement Award in 2008, and the Telecom System Awards form the Telecommunication Advancement Foundation in 2003 and 2005. His current research interest include ultra wideband wireless systems, mobile communication channel characterization, and teletraffic evaluation of mobile communication networks.