Iterative Semi-blind Beamforming Algorithm in MIMO-OFDM Systems

A new frequency domain semi-blind beamforming algorithm is proposed in this paper for multiple input multiple output (MIMO) systems in which orthogonal frequency division multiplexing (OFDM) technique is employed. Based on singular value decomposition (SVD) technique, the semi-blind beamforming algorithm eliminates space interference in an iterative manner by shaping antenna patterns in transmitter and receiver sides. The performance of the new algorithm is evaluated for a 16-QAM MIMO-OFDM system by computer simulations under different scenarios. The results show the superiority of the proposed algorithm in comparison with semi-blind subspace method.