1. School of Electronic and Information Engineering and the Frontiers Science Center for Smart High-Speed Railway System, Beijing Jiaotong University, Beijing, China
2. College of Computing and Data Science, Nanyang Technological University, Jurong West, Singapore
3. School of Electrical and Electronics Engineering, Nanyang Technological University, Jurong West, Singapore
4. Department of Electrical and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
5. Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada