1. Institute for Signal Processing and Systems, Shanghai Jiao Tong University, Shanghai, China
2. Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, China
3. State Key Laboratory of Mobile Network and Mobile Multimedia Technology, ZTE Corporation, Shenzhen, China
4. Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, USA
5. Faculty of Information Technology, Beijing University of Technology, Beijing, China