Linear Precoding of Unitary Space-Time Code for GLRT Decoder

Yongliang GUO  Shihua ZHU  Zhonghua LIANG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.2   pp.695-699
Publication Date: 2008/02/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.2.695
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Communication Theory and Signals
linear precoding,  pair-wise error probability,  generalized likelihood ratio test decoder,  unitary space-time code,  

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For unitary space-time code (USTC), the impact of spatial correlation on error performance is investigated. A tighter and simpler upper bound is derived for generalized likelihood ratio test decoder. We establish that the spatial correlation does not change the diversity gain, whereas it degrades the error performance of USTC. Motivated by the precoding of space-time block code, we designed a precoder for USTC to handle the case of the joint transmit-receive correlation. Numerical results show that the degradation in performance due to spatial correlation can be considerably compensated by the proposed algorithm.