How Accurate does Channel Prediction Need to be in Adaptive V-BLAST Systems?

Lan TANG
Pengcheng ZHU
Jingyu HUA
Xiaohu YOU

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B    No.4    pp.1012-1016
Publication Date: 2007/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.4.1012
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
channel prediction,  adaptive V-BLAST,  MSE,  

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Summary: 
Since the accuracy of channel prediction influences the performance of adaptive multiple-input-multiple-output (MIMO) systems in Rayleigh fading channels, we analyze the performance of adaptive V-BLAST systems with a minimum-mean-square-error (MMSE) channel predictor in this paper. Considering the channel prediction error, we obtain the closed-form expressions for the bit-error-rate (BER) and throughput of adaptive V-BLAST systems, and maximize system transmission rate by choosing optimum block length under BER constraint. The numerical results reveal the critical value of channel prediction error below which systems can match the transmission rate of the systems with perfect channel prediction.