1. School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China
2. Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology, Postdoctoral Research Center, Chongqing University of Posts and Telecommunications, Chongqing, China
3. Pillar of Information Systems Technology and Design, Singapore University of Technology and Design, Singapore, Singapore