I. Introduction
The radio propagation and wireless channel are essential to wireless control system for train traveling at speeds exceeding 300 km/h. Some environments encountered in high-speed railway, such as viaducts and cuttings, present unique radio propagation features. A novel pathloss model for cuttings is proposed in [1] taking the cutting width into account. The statistical properties of Ricean factors in viaduct and cutting scenarios are estimated in [2]. Jinghui Lu in [3] investigates the pathloss, shadow fading and dynamic range of small scale fading in viaducts and cuttings and shows that the propagation condition in cuttings is worse than that in viaducts. It is also shown that the multipath in cuttings is richer than viaduct and plain scenarios, which results in large delay spread and big shadow fading [1] [4].