1. Chongqing Key Laboratory of Mobile Communications Technology, Engineering Research Center of Mobile Communications of the Ministry of Education, and School of Communication and Information Engineering, Institute for Advanced Sciences, Chongqing University of Posts and Telecommunications, Chongqing, China
2. Key Laboratory of Flight Techniques and Flight Safety, Institute of Electronic and Electrical Engineering, Civil Aviation Flight University of China, Sichuan, China
3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore