A semi-empirical MIMO channel model for high-speed railway viaduct scenarios

In this paper, a semi-empirical multiple-input multiple-output (MIMO) channel model is proposed for highspeed railway (HSR) viaduct scenarios. The proposed MIMO model is based on single-input single-output (SISO) wideband channel measurements under a viaduct on Zhengzhou-Xi´an HSR in China and a geometry-based stochastic model (GBSM) composed of a one-ring model and an elliptical model. Environment-related parameters in the GBSM are determined by the measured temporal fading characteristics such as K-factor and Doppler power spectral density (PSD). Close agreement is achieved between the model results and measured data. Finally, a deterministic simulation model is established to perform the analysis of the space-time correlation function, the space-Doppler PSD and the channel capacity. This model is more realistic and is particularly beneficial for the performance evaluation of MIMO systems in HSR environment.