Decentralized limited-feedback multiuser MIMO for temporally correlated channels

Authors:
B. Eduardo Zacarías;Stefan Werner;Risto Wichman
Affiliations:
Department of Signal Processing and Acoustics, Aalto University School of Science and Technology, Aalto, Finland;Department of Signal Processing and Acoustics, Aalto University School of Science and Technology, Aalto, Finland;Department of Signal Processing and Acoustics, Aalto University School of Science and Technology, Aalto, Finland
Venue:
Journal of Electrical and Computer Engineering
Year:
2010

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Abstract

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.