1. School of Microelectronics, Tianjin University, Tianjin, China
2. School of Electrical and Information Engineering, Tianjin University, Tianjin, China
3. Guangzhou Institute of Technology, Xidian University, Guangzhou, China
4. Department of Information and Electronic Engineering, Muroran Institute of Technology, Muroran, Japan
5. Department of Electrical and Computer Engineering, University of Windsor, Windsor, Canada
6. School of Computer Science, University of Oklahoma, Norman, OK, USA