1. School of Microelectronic and Communication Engineering, Chongqing University, Chongqing, China
2. College of Electronic and Information Engineering, Southwest University, Chongqing, China
3. Chongqing Key Laboratory of Bio-perception and Intelligent Information Processing, Chongqing University, Chongqing, China
4. School of Mathematics and Statistics, Southwest University, Chongqing, China
5. School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, China