Corresponding Author: Xiaoming Dai, email: daixiaoming@ustb.edu.cn, received the B.S. degree in electrical engineering and automation from Central South University of Technology, Changsha, China, in 1994 and the M.S. and Ph.D. degrees in electrical engineering and automation (honors) from Shanghai Jiaotong University, Shanghai, China, in 1999 and 2002, respectively. He is currently a professor of the School of Computer and Communication Engineering in the University of Science and Technology Beijing (USTB), Beijing 100083, China. His main research interests include Non-orthogonal multiple-access, MIMO detection, Massive MIMO, and statistical signal processing.