Improved MMSE Vector Precoding Based on the MBER Criterion

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Executive Summary

A novel vector precoding scheme is proposed for the downlink of a multiuser system equipped with multiple antennas transmitting to single-antenna aided mobile receivers. The authors' transmit preprocessing scheme first invokes a regularized channel inversion and then superimposes a perturbation vector to directly minimize the Bit Error Ratio (BER) of the system as an improvement to the well-known Minimum Mean-Square-Error (MMSE) vector precoding scheme. Their simulation results demonstrate that the proposed vector precoding scheme acheives the same BER performance as the MMSE vector precoding at the same complexity, when only discrete vector perturbations are allowed.

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