An acceleration method for ray-tracing simulation based on channel quasi-stationarity regions

In this paper, an efficient method aiming at speeding up ray-tracing (RT) channel simulations has been proposed for time-varying channels. The analysis on the non-wide-sense-stationarity (non-WSS) of the vehicle-to-infrastructure (V2I) channel is based on simulations carried out in an urban scenario at 28 GHz. In order to accelerate the RT channel simulation, the total received power is separated into two parts: 1) the power of direct path component (DPC); 2) the power of other multi-path components (MPCs). Then, the quasi-stationarity regions (QSRs) are calculated by the correlation of power (CP) algorithm for the two types of power. Correspondingly, the mobile channel is divided into the large-scale segments and the small-scale segments which will be treated as new sampling intervals for RT simulations. The validation shows that the proposed new sampling interval mechanism can accelerate RT simulations while keeping the similar channel characteristics as using traditional sampling interval − 1/2 wavelength.