1. Department of Mobile Communications and Terminal Research, China Telecom Research Institute, Guangzhou, China
2. School of Information Science and Technology, ShanghaiTech University, Shanghai, China
3. School of Informatics and the Key Laboratory of Underwater Acoustic Communication and Marine Information Technology (Ministry of Education), Xiamen University, Xiamen, China
4. School of Cyber Science and Technology, Beihang University, Beijing, China
5. Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong, China
6. School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, NSW, Australia