1. School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China
2. School of Computer Science and Engineering, Nanyang Technological University, Jurong West, Singapore
3. Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi, United Arab Emirates
4. National Mobile Communications Research Laboratory, Southeast University, Nanjing, China
5. Pillar of Information Systems Technology and Design, Singapore University of Technology and Design, Tampines, Singapore