1. State Key Laboratory of Rail Traffic Control and Safety and the Collaborative Innovation Center of Railway Traffic Safety, Beijing Jiaotong University, Beijing, China
2. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China
3. School of Electronics and Computer Science, University of Southampton, Southampton, U.K
4. State Key Laboratory of Rail Traffic Control and Safety and the Beijing Engineering Research Center of High-Speed Railway Broadband Mobile Communications, Beijing Jiaotong University, Beijing, China
5. School of Information Engineering, Zhengzhou University, Zhengzhou, China