He was with AT&T Bell Laboratories in New Jersey and joined to Seoul National University, Korea, where he is a Professor and served as Department Head for EECS and Director of Institute of New Media and Communications. He received BS and MS degrees from Seoul National University and PhD from the University of Michigan at Ann Arbor in 1986. He was a Visiting Professor at the University of Tokyo and NTT Laboratories, Japan, and Tsinghua University, China.
His research activities are in physical layer wireless communications such as MIMO, OFDM, cooperative diversity, and cognitive radio, and their applications to B4G/5G wireless systems. He served as chairman of the committee for coordination of 3G wireless communication technology development in Korea and was principal investigator in communications for ITS Grand Design Project of the Korean government. His laboratory was designated as a National Leading Research Laboratory by the Ministry of Education and Science of Korea. He published over 360 papers and holds thirty-four patents.
He was President of Institute of Electronics Engineers of Korea (renamed Institute of Electronics and Information Engineers) and Korean Society of Broadcast Engineers. He is an IEEE Fellow and Member of the Korean Academy of Science and Technology and the National Academy of Engineering of Korea.
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