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A novel integer frequency offset estimator for OFDM

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Journal of Electronics (China)

Abstract

One of the principal disadvantages of Orthogonal Frequency Division Multiplexing (OFDM) is very sensitive to carrier frequency offset. The integer frequency offset has no effect on the orthogonality among the subcarriers, but it causes a circular shift and phase rotation of the received data symbols sequence, resulting in a Bit Error Rate(BER) of 0.5. In this paper, a novel integer frequency offset estimator for OFDM is derived based on maximum likelihood estimation technique and exploration of the differential relation between two consecutive OFDM data symbol sequences in frequency domain. Its performance is compared with the conventional method by computer simulations for the additive white Gaussian noise channel and a multipath fading channel. Simulation results show that the performance of the proposed estimator is better than the conventional estimator.

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Author information

Authors and Affiliations

  1. Broadband Wireless Communications Laboratory, Information Science Institute, State Key Laboratory of Integrated Service Networks, Xidian University, 710071, Xi’an, China

    Cai Xuelian, Li Jiandong, Li Changle & Chen Chen

  2. China Samsung Telecom R&D Center, 100081, Beijing, China

    Chen Chen

Authors
  1. Cai Xuelian
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  2. Li Jiandong
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  3. Li Changle
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  4. Chen Chen
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Additional information

Supported by the National Natural Science Foundation of China (No.60372048) and Microsoft Research Asia, Key Project of National Natural Science Foundation of China (No.60496316), National “863” Program of China (No.2005AA123910), Teaching Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, P.R.C., and Key Project of Chinese Ministry of Education (No.104171).

Communication author: Chen Chen, born in 1975, male, doctoral candidate. P. O. Box 102, Xidian University, Xi’an 710071, China.

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Cai, X., Li, J., Li, C. et al. A novel integer frequency offset estimator for OFDM. J. of Electron.(China) 22, 569–574 (2005). https://doi.org/10.1007/BF02687835

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  • DOI: https://doi.org/10.1007/BF02687835

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