Limited feedback multiuser MIMO techniques for time-correlated channels

Authors:
B. Eduardo Zacarías;Stefan Werner;Risto Wichman
Affiliations:
Department of Signal Processing and Acoustics, Helsinki University of Technology, Helsinki, Finland;Department of Signal Processing and Acoustics, Helsinki University of Technology, Helsinki, Finland;Department of Signal Processing and Acoustics, Helsinki University of Technology, Helsinki, Finland
Venue:
EURASIP Journal on Advances in Signal Processing - Multiuser MIMO Transmission with Limited Feedback, Cooperation, and Coordination
Year:
2009

Citing 12
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Abstract

This work presents limited feedback schemes for closed-loop multiple-input multiple-output systems using frequency division duplex. The proposed methods employ compact feedback messages in order to (a) feed back and track a complete frequency flat channel matrix, to be used as input to multiuser multiplexing methods designed for full channel side information (CSI) at the transmitter, and (b) enable the receiver to command the transmit weight adaptation, in order tomaximize the link reliability under strong intercell interference. Simulations show that the channel feedback accuracy provided by the proposed algorithms produces a negligible bit error probability (BEP) performance loss in low mobility scenarios compared to the full CSI performance, and that the proposed interference rejection techniques can effectively exploit an estimate of the interference statistics in order to enable multiple-stream communications under the permanent presence of intercell interference signals.