Improved Decision-Feedback Detection Schemes for STBC over Time-Selective Fading Channels

Cheolkyu SHIN
Hyounkuk KIM
Hyuncheol PARK

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.9    pp.3013-3016
Publication Date: 2008/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.9.3013
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
space-time block code (STBC),  time-selective fading channels,  decision-feedback (DF) detection,  

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This letter proposes two efficient decision-feedback (DF) detection schemes for space-time block code (STBC) over time-selective fading channels. The existing DF detection causes error propagation when the first symbol is not detected correctly. However, the proposed detection schemes provide two candidates according to a channel gain or an average log-likelihood ratio (LLR) based selection rule and choose a better candidate for the first symbol. Simulation results show that the proposed detection schemes reduce error propagation and yield significant signal-to-noise ratio (SNR) gain with moderate complexity, compared to the existing DF detection scheme.