Location assistant beamforming for high speed railway

In this paper, we introduce an algorithm of location assistant direction of departure (DOD) based beamforming scheme which is suitable for wireless communication in highspeed railway (HSR). The beamforming weights are calculated according to the locations of mobile station (MS) and base station (BS) together with the topology of multiple transmit antennas. The purpose of the algorithm is to make phase adjustment at the transmitter such that the output signal-to-noise ratio (SNR) at the receiver can be improved. The performance of beamforming with ideal DOD and estimated DOD which has deviation caused by location errors are both evaluated. Results show that beamforming with ideal DOD greatly outperforms all other transmission modes, i.e., transmit diversity and single-input single-output (SISO), while the inevitable DOD estimation error degrades the overall performance.