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, Chongqing University of Posts and Telecommunications, Chongqing, China
2. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
3. Key Laboratory of Flight Techniques and Flight Safety, Institute of Electronic and Electrical Engineering, Civil Aviation Flight University of China, Sichuan, China
4. Institute of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, China