Calibration of ray tracer and channel analysis for high-speed railway viaduct scenario

In this paper, ray tracer (RT) is applied to conduct simulation of the propagation in high-speed railway viaduct scenario at 93.2 GHz. Some basic input parameters such as geometrical dimensions of environment, positions of transmitter and receiver, permittivity of materials are calibrated based on the measurement results. The average error of path loss between simulation and measurement is calibrated to 0.2 dB, obtaining a reasonable improvement of the accuracy of RT. The calibrated results are employed to study propagation characteristics in viaduct scenario. Rician K-factor, root-mean-square (RMS) delay spread, power delay profile and angular spread are calculated. The typical structure of viaduct and the application of horn antennas lead to a small value of each calculated parameters at each snapshot. In addition, correlation between parameters are also analyzed in this paper.