A multiuser multi-antenna system for downlink transmission in frequency-selective fading channels

In frequency-dispersive multipath environments, multiuser multi-antenna systems have to deal with both co-channel interference (CCI) and inter-symbol interference (ISI). This paper presents a novel low-complexity scheme employing single-carrier frequency-domain pre-processing. With known channel information at the transmitter, we derive the optimal pre-weighting matrix which effectively removes the CCI and suppresses ISI simultaneously with low complexity. Simulation results show the improved bit error rate and throughput performance provided by the proposed scheme.