1. College of Electronic and Information Engineering, Southwest University, Chongqing, China
2. School of Electronic Information Engineering, China West Normal University, Nanchong, China
3. College of Big Data and Information Engineering and the Key Laboratory of Optoelectronic Technology and Application of Guizhou Province, Guizhou University, Guiyang, China
4. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore