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Improving robustness of precoded MIMO systems with imperfect channel estimation

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2 Author(s)
Colman, G.W.K. ; Commun. Res. Centre, Ottawa, ON, Canada ; Willink, T.J.

Low-rate feedback schemes have recently provided a means to achieve near optimal performance in multiple-input multiple-output communications systems while reducing feedback overhead to acceptable levels. In this paper, a bit-error rate expression for precoded systems is derived as a function of the channel estimation uncertainty. Poor channel state estimates are shown to degrade error rate performance significantly; however, if the channel estimation uncertainty is taken into account when selecting feedback parameters, it is shown that target performance can be maintained without wasting resources.

Published in:

Communications, Computers and Signal Processing, 2009. PacRim 2009. IEEE Pacific Rim Conference on

Date of Conference:

23-26 Aug. 2009