摘要：Security is a significant issue in wireless communication systems due to the openness of wireless medium. Traditionally, security is dealt with using upper layer cryptography schemes. However, the cryptography schemes might be broken due to the ever-increasing capabilities of attackers. An supplementary approach to enhance security is through physical layer, which can provide perfect security. In this talk, we will talk about the main idea about physical layer security through cooperation. We mainly focus on the following issues: i) with whom to cooperate; ii) how to stimulate cooperation; and iii) how to cooperate. A three-step cooperative scheme is proposed, whereby the source selects partners and stimulates them for secure communications by paying an amount of reward. Simulation results are provided to evaluate the proposed approach. Finally, ?the potential research topics will be discussed.
报告人简介：Ning Zhang earned his Ph.D degree from the University of Waterloo, Ontario, Canada, in 2015. He received his B.Sc. degree from Beijing Jiaotong University and his M.Sc. degree from Beijing University of Posts and Telecommunica- tions, China, in 2007 and 2010, respectively. From May 2015 to April 2016, he was a postdoctoral research fellow in the BBCR lab at the University of Waterloo. He is now a postdoctoral research fellow at the University of Toronto. He is now an Asso- ciate Editor of the International Journal of Vehicle Information and Communication Systems and a Guest Editor of Mobile Infor- mation Systems. He was the recipient of the Best Paper Award at IEEE GLOBECOM 2014 and IEEE WCSP 2015. His current research interests include next generation wireless networks, software de ned networking, network virtualization, and physi- cal layer security.