Bit Error Rate Minimizing Antenna Selection in Zero-Forcing Precoded MU-MIMO Systems.

This work focuses on the downlink of a Zero- Forcing (ZF) precoded multiuser multiple-input multiple-output (MU-MIMO) systems where the Base Station (BS) and the users stations (UE s ) transmit and receive information symbols, respectively, by selected subset of their antennas. An optimal transmit antenna selection procedure is proposed aiming at the maximization of the detection signal-to-noise ratio and consequent minimization of the detection error probability. A suboptimal search algorithm able to deliver a performance close to the one resulting from the optimal exhaustive search selection is proposed. The receive antenna selection is also performed using a similar optimization criterion. BER performance results, obtained via simulation and semi-analytical approaches, are presented for different scenarios.