A New Beamforming Method for MIMO-OFDM Systems

Recently, the attentions of communication societies are paid to MIMO-OFDM systems. In this paper we propose a new beamforming method to the receive end of MIMO-OFDM systems. To make the method work with fewer known OFDM symbols, oversampling samples are employed and multistage decomposition based on orthogonality of sub-carriers of OFDM signal is used to formulate the beamforming weight vector for each sub-carrier according to least square criterion. Simulation results demonstrate that the proposed method is effective in the equalization of space-time sub-channels and the suppression of cochannel interference signals at each sub-carrier.