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Joint Frequency Ambiguity Resolution and Accurate Timing Estimation in OFDM Systems with Multipath Fading

EURASIP Journal on Wireless Communications and Networking volume 2006, Article number: 062173 (2006) Cite this article

Abstract

A serious disadvantage of orthogonal frequency-division multiplexing (OFDM) is its sensitivity to carrier frequency offset (CFO) and timing offset (TO). For many low-complexity algorithms, the estimation ambiguity exists when the CFO is greater than one or two subcarrier spacing, and the estimated TO is also prone to exceeding the ISI-free interval within the cyclic prefix (CP). This paper presents a method for joint CFO ambiguity resolution and accurate TO estimation in multipath fading. Maximum-likelihood (ML) principle is employed and only one pilot symbol is needed. Frequency ambiguity is resolved and accurate TO can be obtained simultaneously by using the fast Fourier transform (FFT) and one-dimensional (1D) search. Both known and unknown channel order cases are considered. Computer simulations show that the proposed algorithm outperforms some others in the multipath fading channels.

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Authors and Affiliations

  1. National Laboratory of Radar Signal Processing, Xidian University, Xi'an, 710071, China

    Jun Li & Guisheng Liao

  2. Department of Communication and Information Engineering, Guilin University of Electronic Technology, Guilin, 541004, China

    Shan Ouyang

Authors
  1. Jun Li
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  2. Guisheng Liao
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  3. Shan Ouyang
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Correspondence to Jun Li.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, J., Liao, G. & Ouyang, S. Joint Frequency Ambiguity Resolution and Accurate Timing Estimation in OFDM Systems with Multipath Fading. J Wireless Com Network 2006, 062173 (2006). https://doi.org/10.1155/WCN/2006/62173

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  • DOI: https://doi.org/10.1155/WCN/2006/62173

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