Deployment mode and optimization system for RIS-aided high-speed rail communication

At present, Reconfigurable intelligent surface (RIS) has attracted the attention of the industry since its birth, which has the characteristics of low power consumption, low cost, and easy deployment and is even considered as the the most promising technologies for 6G. This paper proposed a RIS-aided high-speed railway communications scheme, which firstly compensates the Doppler shift of LOS component in the cascade channel by adjusting the phase of the RIS reflected signal, and then improves the received signal quality by maximizing the LOS path beam shaping gain, and coherently superimposes the RIS reflected signal and the base station transmitted signal at the receiving end. The simulation results show that the deployment and optimization system for RIS-assisted high-speed rail wireless communication system can effectively reduce the fast fading effect of high-speed mobile on wireless channels, and the system bit error rate performance has also been significantly improved compared with the scenario without deploying RIS.