Ray-Tracing Based Millimeter-Wave Channel Characteristics in Subway Carriage

The rapid deployment of the fifth generation (5G) systems and the ever growing demand for high-density services have promoted our urgent research on the channel characteristics. Based on the ray-tracing (RT) simulation technology, this paper discusses the channel characteristics in subway carriage scenarios at 26 GHz and 38 GHz millimeter-wave (mm-wave) bands. Key parameters such as path loss, root mean square (RMS) delay spread, power angle spectrum, angular spread, and spatial correlation are investigated. In addition, the parameter of lateral distance from the longitudinal centerline of the carriage is introduced into the modified path loss model to improve the prediction accuracy.