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Course Frequency-Offset Acquisition via Subcarrier Differential Detection for OFDM Communications

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1 Author(s)

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.

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Communications, IEEE Transactions on  (Volume:54 ,  Issue: 5 )