Shanshan Li (李姗姗), Qi Zhang (张琦)*, XiangjunXin (忻向军), RanGao (高然), Sitong Zhou (周思彤), Ying Tao (陶 滢), Yufei Shen (沈宇飞), Huan Chang (常 欢), Qinghua Tian (田清华), Feng Tian (田 凤), Yongjun Wang (王拥军), and Leijing Yang (杨雷静) School of Electronic Engineering, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, China Beijing Key Laboratory of Space-round Interconnection and Convergence, BUPT, Beijing 100876, China State Key Laboratory of Information Photonics and Optical Communications, BUPT, Beijing 100876, China The Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China China Academy of Space Technology, Beijing 100094, China China Satellite Communication Co., Ltd., Beijing 100048, China School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China *Corresponding author: zhangqi@bupt.edu.cn Received April 29, 2020; accepted August 18, 2020; posted online September 27, 2020