Corresponding Author: Gongpu Wang, e-mail: gpwang@bjtu.edu.cn, received the B.Eng. degree in communication engineering from Anhui University, Hefei, Anhui, China, in 2001, the M.Sc. degree from Beijing University of Posts and Telecommunications, Beijing, China, in 2004. From 2004 to 2007, he was an assistant professor in Beijing University of Posts and Telecommunications. He received Ph.D. degree from University of Alberta, Edmonton, Canada, in 2011. Currently, he is an associate professor in School of Computer and Information Technology, Beijing Jiaotong University, China. His research interests include wireless communication theory and signal processing technologies.