Joint optimization of precoder and decoder in multiuser MIMO systems with imperfect channel state information(CSI)

In this paper, we address the problem of joint transceiver optimization for downlink of multiuser multiple-input, multiple-output systems employing improper constellations such as binary phase shift-keying (BPSK) and M-ary amplitude shift-keying (M-ASK). Proposed are novel joint linear transceivers that minimize the total mean squared error (TMSE), subject to a total transmit power constraint. The joint linear transceiver designs are carried out for the cases of imperfect channel state information (CSI). The channel model takes into account both transmit and receive correlations as well as the channel estimation error. Simulation results indicate that the performance improvement of the proposed joint transceiver designs over the previously-proposed designs.