Zhao Pengyu, Wang Xiaoyong, Zhang Kai, Jin Yanliang, Zheng Guoxin
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China.
CASCO Signal Ltd., Shanghai 200071, China.
Sensors (Basel). 2022 Jun 4;22(11):4289. doi: 10.3390/s22114289.
The communication system of urban rail transit is gradually changing from train-to-ground (T2G) to train-to-train (T2T) communication. The subway can travel at speeds of up to 200 km/h in the tunnel environment, and communication between trains can be conducted via millimeter waves with minimum latency. A precise channel model is required to test the reliability of T2T communication over a non-line-of-sight (NLoS) Doppler channel in a tunnel scenario. In this paper, the description of the ray angle for a T2T communication terminal is established, and the mapping relationship of the multipath signals from the transmitter to the receiver is established. The channel parameters including the angle, amplitude, and mapping matrix from the transmitter to the receiver are obtained by the ray-tracing method. In addition, the channel model for the T2T communication system with multipath propagations is constructed. The Doppler spread simulation results in this paper are consistent with the RT simulation results. A channel physics modelling approach using an IQ vector phase shifter to achieve Doppler spread in the RF domain is proposed when paired with the Doppler spread model.
城市轨道交通的通信系统正逐渐从车地通信（T2G）向车车通信（T2T）转变。地铁在隧道环境中最高可行驶200公里/小时，列车之间的通信可通过毫米波进行，延迟最小。需要一个精确的信道模型来测试隧道场景中非视距（NLoS）多普勒信道上车车通信的可靠性。本文建立了车车通信终端的射线角度描述，建立了多径信号从发射机到接收机的映射关系。通过射线追踪方法获得了包括角度、幅度以及从发射机到接收机的映射矩阵在内的信道参数。此外，构建了具有多径传播的车车通信系统的信道模型。本文的多普勒扩展仿真结果与射线追踪（RT）仿真结果一致。当与多普勒扩展模型配合使用时，提出了一种使用IQ矢量移相器在射频域实现多普勒扩展的信道物理建模方法。
