1. Research Center of 6G Mobile Communications, School of Cyber Science and Engineering, and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
2. Institute of Space Integrated Ground Network, Hefei 230094, China; The 38th Research Institute of China Electronics Technology Group Corporation, Hefei 230088, China
3. School of Electronics Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China