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A novel Minimum Bit-Error Rate (MBER) Space-Time-Equalization (STE)-based Multi-User Detector (MUD) is proposed for multiple-receive-antenna-assisted space-division multiple-access systems. It is shown that the MBER-STE-aided MUD significantly outperforms the standard minimum mean-square error design in terms of the achievable Bit-Error Rate (BER). Adaptive implementations of the MBER STE are considered, and both the block-data based and sample-by-sample adaptive MBER algorithms are proposed. The latter, referred to as the Least BER (LBER) algorithm, is compared with the most popular adaptive algorithm, known as the Least Mean Square (LMS) algorithm.
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