1. State Key Laboratory of Rail Traffic Control and Safety, the Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications, and the School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
2. State Key Laboratory of Rail Traffic Control and Safety, the Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications, the School of Electronic and Information Engineering, and the Frontiers Science Center for Smart High-Speed Railway System, Beijing Jiaotong University, Beijing, China
3. State Key Laboratory of Rail Traffic Control and Safety, the Beijing Engineering Research Center of EMC and GNSS Technology for Rail Transportation, and the School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
4. State Key Laboratory of Mobile Network and Mobile Multimedia Technology, Shenzhen, China
5. GuangDong Communications & Networks Institute, Guangzhou, China