1. State Key Laboratory of Rail Traffic Control and Safety, and the Key Laboratory of Railway Industry of Broadband Mobile Information Communications, Frontiers Science Center for Smart High-Speed Railway System, Beijing Jiaotong University, Beijing, China
2. School of Electronic Information, Wuhan University, Hubei, China
3. State Key Laboratory of Rail Traffic Control and Safety, and the Key Laboratory of Railway Industry of Broadband Mobile Information Communications, Beijing Engineering Research Center of High-Speed Railway Broadband Mobile Communications, Beijing Jiaotong University, Beijing, China
4. State Key Laboratory of Rail Traffic Control and Safety, and the Key Laboratory of Railway Industry of Broadband Mobile Information Communications, Beijing Jiaotong University, Beijing, China