DocumentCode :
933591
Title :
Course Frequency-Offset Acquisition via Subcarrier Differential Detection for OFDM Communications
Author :
Lin, Jia-Chin
Volume :
54
Issue :
5
fYear :
2006
fDate :
5/1/2006 12:00:00 AM
Firstpage :
955
Lastpage :
955
Abstract :
An effective frequency-offset acquisition technique based on differential detection for wireless orthogonal frequency-division multiplexing communication is investigated. By exploiting differentially coherent detection involving coherent cross-correlation extraction and subsequent differential detection, data-aided frequency acquisition assisted by frequency-domain pseudonoise matched filters reduces probabilities of false alarm and miss over a propagation channel with a sufficiently wide coherence bandwidth. Furthermore, the proposed technique uses the inherent frequency diversity with maximum ratio combining, and exploits subcarrier-level differential detection and subsequent coherent cross-correlation accumulation. To realize the subcarrier-level differential-detection approach proposed here, the n -lock sequence must be modified by taking into consideration the self-interference caused by Rayleigh fading, and the out-of-lock sequence must be remodeled by means of the discrete Wiener process. Statistical analysis and extensive computer simulation verify the superiority of the proposed technique.
Keywords :
Bandwidth; Diversity reception; Fading; Frequency diversity; Frequency division multiplexing; Lagrangian functions; Matched filters; OFDM; Scheduling algorithm; Vector quantization;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2006.873977
Filename :
1632110
Link To Document :
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