Abstract
This paper focuses on the analysis of propagation characteristics for train-ground communication (TGC) systems in tunnel scenarios at both low frequency and millimeter-wave (mmWave) bands, based on ray-tracing (RT) simulation. The material parameters in the RT simulation are calibrated by measurement data collected in realistic tunnel environments. A practical three dimension (3D) tunnel TGC environment considering the existence of train cars is established, which is further divided into three kinds of scenarios, involving the direct coverage, relay coverage, and in-train coverage scenarios. Both large-scale and small-scale propagation characteristics, such as path loss and root mean square delay spread, are analyzed for the three tunnel TGC scenarios. The obtained results can provide useful information for the design of future fifth-generation (5G) tunnel TGC systems.
Highlights
Train-ground communication (TGC) is the indispensable part of modern rail transit systems, e.g., railway and subway, which has always been a much-discussed research topic in both the academy and industry [1], [2]
It is found that the path loss (PL) values for cases with and without train cars are similar when the distance between Tx and Rx antennas (T-R distance) is less than 60 m
Realistic channel measurement data are collected in the experimental tunnel and used for calibrating the material parameters
Summary
Train-ground communication (TGC) is the indispensable part of modern rail transit systems, e.g., railway and subway, which has always been a much-discussed research topic in both the academy and industry [1], [2]. This is because it is highly difficult to conduct propagation measurements for TGC in tunnel scenarios where the train cars should be included. Based on measurements conducted in a subway tunnel with train cars at 5G mmWave band, a RT model has been calibrated and used to analyze more mmWave propagation characteristics [27].
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