Optimal joint spatial and temporal power adaptation for space-time-coded systems with imperfect CSI

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Article number6182734
Pages (from-to)3335-3339
Journal / PublicationIEEE Transactions on Signal Processing
Volume60
Issue number6
Publication statusPublished - Jun 2012

Abstract

In this correspondence, a joint optimization of spatio-temporal (S-T) power allocation to minimize the average bit error rate (BER) subject to an average power constraint is developed for beamforming orthogonal space-time block coded multiantenna systems over flat Rayleigh fading channels in the presence of imperfect channel state information at the transmitter (CSIT). Compared to the spatial-only (S-O) power allocation methods, the optimal S-T strategy reduces BER significantly. It can be used as a benchmark to evaluate the existing suboptimal S-T schemes. A necessary and sufficient condition, which can determine the number of eigenbeams being used for optimal S-T power allocation without computing power allocation, is derived. This result can greatly simplify the power allocation algorithm. Numerical results show that the proposed optimal S-T algorithm has not only the best BER performance, but also the lowest computational complexity in comparison with the existing S-T strategies. © 2012 IEEE.

Research Area(s)

  • Beamforming, Multiple-input multiple-output (MIMO), Spatio-temporal power allocation