1. College of Electronic and Information Engineering, Hebei University, Baoding, China
2. Beijing Communication Division, China Railway Beijing Group Company Ltd., Beijing, China
3. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China
4. State Key Laboratory of Advanced Rail Autonomous Operation, the School of Electronic and Information Engineering, and the Frontiers Science Center for Smart High-Speed Railway System, Beijing Jiaotong University, Beijing, China,