Precoding on the broadcast MIMO channel with delayed CSIT : The finite SNR case

Yi, Xinping; Gesbert, David
ICASSP 2012, 37th IEEE International Conference on Acoustics, Speech and Signal Processing, March 25-30, 2012, Kyoto, Japan

Recent information theoretic results suggest that precoding on the multi-user downlink MIMO channel with delayed channel state information at the transmitter (CSIT) could lead to data rates much beyond the ones obtained without any CSIT, even in extreme situations when the delayed channel feedback is made totally obsolete by a feedback delay exceeding the channel coherence time. This surprising result is based on the ideas of interference

forwarding and alignment which allow the receivers to reconstruct an information allowing them to cancel out the interference completely, making it an optimal scheme in the infinite SNR regime. In this paper, we formulate a similar problem, yet at finite SNR. We propose a new construction for the precoder which matches the previous results at infinite SNR yet reaches a useful trade-off between interference alignment and signal enhancement at

finite SNR, allowing for significant performance improvements in practical settings.

Systèmes de Communication
Eurecom Ref:
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