Time-Selective and Frequency-Selective Relay-Based Channel Capacity for Wireless Communication Systems in High-Speed Railway Environment

One open problem for wireless communication in the high-speed railway environment is channel capacity. In this paper, we study the problem of ergodic capacity for the time-selective and frequency-selective wireless channels in the high-speed railway environment. Firstly, we build up the channel model for the wireless communication between mobile users on the high-speed train and the base station along the railway via the train antennas. Next both the upper bound and the lower bound for the ergodic channel capacity are derived on the basis of this model. Furthermore, the closed-form expression for the ergodic channel capacity is obtained at high SNR. Finally, simulation results are provided to corroborate our proposed studies.