A beamforming technique for LTE-based mobile relay stations

In this paper, two receive beamforming techniques with carrier frequency offset (CFOs) compensation (joint receive beamforming technique and spatially-separated receive beamforming technique) are proposed for a mobile relay station with a uniform linear array in OFDM systems. The spatially-separated receive beamforming technique is shown to be robust against CFO errors and can be effectively used for the MRS in a multipath fading channel. The performance of the proposed techniques is evaluated via simulation in an LTE environment.