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Efficient Integer Frequency Offset Estimation Architecture for Enhanced OFDM Synchronization

Pham, Thinh Hung, Fahmy, Suhaib A, McLoughlin, Ian Vince (2016) Efficient Integer Frequency Offset Estimation Architecture for Enhanced OFDM Synchronization. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 24 (4). pp. 1412-1420. ISSN 1063-8210. (doi:10.1109/TVLSI.2015.2453207)

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An integer frequency offset (IFO), in orthogonal frequency-division multiplexing (OFDM) systems, causes a circular shift of the sub-carrier indices in the frequency domain.IFO can be mitigated through strict RF front-end design but this is challenging and expensive. Therefore, IFO is estimated and removed at baseband, allowing the RF front-end specification to be relaxed, thus reducing system cost. For applications susceptible to Doppler shift, and multi-standard radios requiring wide frequency range access, careful RF design may be insufficient without IFO estimation. This paper proposes a novel approach for IFO estimation with reduced power consumption and computational cost. A four-fold resource sharing architecture reduces computational cost, while a multiplierless technique and carefully optimised wordlengths yield further power reduction while maintaining a good accuracy. The novel method is shown to achieve excellent performance, similar to the theoretically achievable bound. In fact, performance is significantly better than conventional techniques, while being much more efficient. When implemented for IEEE 802.16-2009, the proposed method saves 78% power over the conventional technique on low-power FPGA devices. The method is applicable to IEEE 802.11 and IEEE 802.22.

Item Type: Article
DOI/Identification number: 10.1109/TVLSI.2015.2453207
Uncontrolled keywords: OFDM; digital signal processing; field programmable gate arrays;
Subjects: T Technology
Divisions: Faculties > Sciences > School of Computing
Depositing User: Ian McLoughlin
Date Deposited: 19 Apr 2016 10:02 UTC
Last Modified: 29 May 2019 17:14 UTC
Resource URI: (The current URI for this page, for reference purposes)
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