Broadband Channel Inversion and Vector Perturbation for MU-MIMO System Under Frequency Selective Fading

This paper presents single carrier multiuser multiple input multiple output (MU-MIMO) downlink transmission schemes under frequency selective channels based on extension of narrow band MU-MIMO techniques. First, broadband version of channel inversion method adopting time-domain processing is proposed. Then it is further arranged to an energy saving variation using nonlinear strategy, vector perturbation (VP) method. In those methods, transmitter is equipped with spatio-temporal filters adopting tapped delay line (TDL) structure instead of simple spatial weight, and they can avoid some problems specific in frequency-domain approaches. Through computer simulations, the effectiveness and features of those approaches are shown.