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Coarse frequency-offset acquisition via subcarrier differential detection for OFDM communications

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1 Author(s)
Jia-Chin Lin ; Dept. of Commun. Eng., Nat. Central Univ., Chungli

An effective frequency-offset acquisition technique based on differential detection (DD) for wireless orthogonal frequency-division multiplexing communication is investigated. By exploiting differentially coherent detection involving coherent cross-correlation extraction and subsequent DD, 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 operation and subsequent coherent cross-correlation accumulation. To realize the subcarrier-level DD approach proposed here, the in-lock sequence must be modified by taking self-interference caused by Rayleigh fading into account, and the out-of-lock sequence must be remodeled by means of the discrete Wiener process. Statistical analysis and extensive computer simulation verifies the superiority of the proposed technique

Published in:

Communications, IEEE Transactions on  (Volume:54 ,  Issue: 8 )

Date of Publication:

Aug. 2006

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