Survey And Establishment Of Wireless Channel Model For High Speed Railway

With the development of High Speed Railway (HSR), the existing railway communication system GSM-R faces new challenges. In order to meet the HSR environment features and demands of customers, the wireless communication system based on LTE is proposed. Wireless channel model becomes a focal and hot point of research as a necessary part for system establishment and optimization. Base on the background, this subject mainly research wireless fading channel, channel model classifications and channel modeling methods of MIMO, which form the theory foundation for the subject. The subject focuses on WINNERII standard channel model and establishes simulation platform for high speed scenario, based on which simulations proceed about channel capacity and frequency dependency, as well as the comparing with SCM (Spatial Channel Model). The research and simulations of WINNERII channel model provide theory basis for the following work. Furthermore, the subject chooses urban, open field and hilly area through analyzing the environment along railway and cell coverage scheme. With the same channel modeling method as WINNERII, i.e. GSCM (Geometry Stochastic Channel Model), the subject proceeds modeling by assuming the distribution of scatterers along railways. Through computing the PDP (Power Delay Profile) and Doppler spectrum, the subject illustrates the rationality of channel models. Also, it compares HSR channel model with WINNERII high speed scenario in open field on the channel capacity, Azimuth Spread (AS) and Delay Spread (DS) to confirm the model correctness. Simultaneously, the simulation results illustrate that the modeling method we applied is adaptable to HSR environment.