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. College of Information Engineering, Shaoyang University, Shaoyang, China
4. Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, China