Space-Time Domain Optimization of Transmitter Weights in Closed-Loop Transmit Antenna Diversity

Ye Hoon LEE  Nam-Soo KIM  Seung Young PARK  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.10   pp.4121-4124
Publication Date: 2005/10/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.10.4121
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
transmitter weights,  transmit antenna diversity,  peak transmit power,  

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Summary: 
The optimal antenna weighting scheme that minimizes the average bit error rate in a closed-loop transmit antenna diversity system is investigated under the assumption that channel state information is provided at both the transmitter and the receiver. A closed-form expression for the optimal transmitter weights is derived with a fixed average transmit power constraint. Also, the effect of limited peak transmit power on the performance of the optimal weighting method is analyzed. Base on this analysis, it is shown that the proposed transmitter weights yield significant performance improvements over the conventional weights on the wide range of practical system parameters.