1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. School of Electronic Information and Electrical Engineering, Chengdu University, Chengdu, China
3. School of Mathematics Sciences, University of Electronic Science and Technology of China, Chengdu, China
4. Division of IT Convergence Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
5. School of Electrical Engineering, Chungbuk National University, Seowon-Gu, Cheongju, South Korea
6. School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, China