1. Department of Communication Science and Engineering and the Key Laboratory for Information Science of Electromagnetic Waves, Ministry of Education (MoE), Fudan University, Shanghai, China
2. School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an, China
3. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China
4. Wireless Network RAN Research Department, Shanghai Huawei Technologies Company Ltd., Shanghai, China