1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
2. Faculty of Information Technology, Macau University of Science and Technology, Macau, China
3. National Key Laboratory on Wireless Communications, Shenzhen Institute for Advanced Study, Center for Intelligent Networking and Communications, University of Electronic Science and Technology of China, Chengdu, China
4. Engineering Research Center of Network Management Technology for High Speed Railway of Ministry of Education, Beijing Jiaotong University, Beijing, China
5. School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore
6. Aerospace New Generation Communications Company, Ltd., Chongqing, China