Wu, Jianjun

Professor

Research Interests: Satellite Communications, wireless Communications

Office Phone: 86-10-6275 2848

Email: just@pku.edu.cn

Wu, Jianjun is a professor in the Department of Electronics Engineering, School of EECS, and Peking University. He received his B.S., M.S. and Ph.D. degree from Peking University in 1989, 1992 and 2006, respectively. Since 1992, he has joined in the School of Electronics Engineering and Computer Science, Peking University, and has been appointed as a professor since 2014. His research interests include satellite communications system, spread spectrum technology, ultra-wideband communications, 3G/4G mobile communications and networking, cognitive radio network, Broadband Coaxial Network, etc.

Dr. Wu has published more than 200 research papers in conferences and journals, among which 100 more have been indexed by SCI and/or EI. And he has also received more than 20 items of patent grant from State Intellectual Property Office of China. Dr. Wu is serving as a member of satellite communications specialized committee in China institute of communications, the director of engineering technology research center for broadband coaxial network in State Administration of Press Publication, Radio, Film and Television of China.

Dr. Wu has more than ten research projects including NSFC, 863 project, etc. His research achievements are summarized as follows:

1) B3G/4G compatible satellite air interface: This research focuses on the key techniques of a new air interface for the next generation satellite communications system, which will be compatible to the terrestrial B3G/4G standard. The impacts of mobile satellite channel on terrestrial B3G/4G technologies have been thoroughly analyzed at first. The air interface scheme of next generation mobile satellite communications is proposed then, while its parameters have been carefully optimized.

2) Quasi-single frequency multi-beam satellite system: An interference cancellation scheme is designed for multi-beam satellite system in order to realize quasi-single frequency reuse, including uplink parallel/serial interference cancellation and downlink interference pre-cancellation methods. For farther performance improvement, the combination of Tomlinson Harashima precoding and resource scheduling is proposed on downlink interference.

3) Large scale targets beam-tracking techniques of multi-beam satellite: The research of this project begins with theoretic analysis of the projection far-field of offset parabolic reflector with feeds array in focal or off focal. The adaptive beam-forming algorithms are investigated then. Furthermore, a novel scheme of dynamic beamforming network is proposed, in which a programmable on-off switch array with special pattern is designed to connect beam-inputs to different feed-outputs in order to enable the tracking beams.