Minimum bit error rate multiuser detection for multiple antenna aided uplink OFDM

Abstract — In this contribution, we propose a Minimum Bit Error Rate (MBER) multiuser detector for Space Divi-sion Multiple Access (SDMA) aided Orthogonal Frequency Division Multiplexing (OFDM) systems. It is shown that the MBER detector outperforms the Minimum Mean Squared Error (MMSE) detector, since the MBER detector directly minimizes the BER, while MMSE detector minimizes the mean-squared error (MSE), which does not guarantee achiev-ing the minimum BER. When supporting two users, the proposed MBER scheme substantially outperforms the clas-sic MMSE arrangement in the investigated propogation sce-nario. I