Ber optimized unimode precoder design for MIMO-OFDM based spatial multiplexing systems

A bit error rate optimized unimode selection algorithm is proposed for MIMO-OFDM based spatial multiplexing systems using linear receivers. For a fixed number of antennas, the proposed scheme dynamically selects the number of subcarriers used for transmission. The proposed method increases the diversity advantage of spatial multiplexing systems without the use of computational expensive spacetime receivers such as ML and VBLAST. Simulation results show that the proposed unimode technique outperforms existing ones in terms of link reliability by performing selection of data streams across different subcarriers, and compensating significantly attenuated subcarriers due to deep fades.