Geometrical channel characterization for high speed railway environments using propagation graphs methods

In this paper, a new geometry-based channel characterization technique for the high-speed railway scenarios is employed by using the graphic methods. The multi-dimensional channel parameters, such as time delay and Doppler property, can be extracted analytically for the specific environment. By using the graph modeling approach, the channel impulse responses (CIRs) can be calculated by searching for propagation paths, which provide a solid theoretical foundation for high-quality research of ultra-high-speed mobile communications. Then Von Mises distribution is used to model the non-uniform Angle-of-Arrival (AoA) at Rx, and the simulation results can be applied to characterize the feasibility of the theoretical channel modeling method. Finally, the established model is compared with the actual measurement data in cutting scenario. The statistical results from the proposed model including the time-varying power delay profile and rapid Doppler transition show a good match with the experimental data, which shows that the study of the proposed modeling method is significant.