Decentralized limited-feedback multiuser MIMO for temporally correlated channels

This paper proposes a novel multiuser (mu) multiplexing scheme for temporally correlated multiple-input,multiple-output (mimo) channels,suitable for systems employing low-rate feedback links. a decentralized solution is obtained by the mobile receivers,which employ interference rejection combiner (irc) linear filters and command the update of the corresponding per-user antenna transmit weights through compact feedback messages,thus avoiding explicit transmission of channel information. the proposed limited-feedback algorithm outperforms existing mu-mimo solutions employing quantized matrices,operating at the same feedback overhead. a compensation mechanism is presented,which enables the proposed solution to operate under moderate probabilities of feedback errors,at the expense of a small downlink overhead. © 2010 eduardo zacaras b et al.