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Journal of Electrical and Computer Engineering
Volume 2010, Article ID 915653, 9 pages
http://dx.doi.org/10.1155/2010/915653
Research Article

Decentralized Limited-Feedback Multiuser MIMO for Temporally Correlated Channels

Department of Signal Processing and Acoustics, Aalto University School of Science and Technology, P.O. Box 13000, 00076 Aalto, Finland

Received 9 December 2009; Revised 25 March 2010; Accepted 26 May 2010

Academic Editor: Markku Juntti

Copyright © 2010 Eduardo Zacarías B et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.