School of Information Engineering East China Jiaotong University Nanchang 330013 China;
School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China;
School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China;
School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China;
State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China;
School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China;