ML estimation of time and frequency offset in OFDM systems

@article{Beek1997MLEO,
  title={ML estimation of time and frequency offset in OFDM systems},
  author={Jan-Jaap van de Beek and Magnus Sandell and Per Ola B{\"o}rjesson},
  journal={IEEE Trans. Signal Processing},
  year={1997},
  volume={45},
  pages={1800-1805}
}
We present the joint maximum likelihood (ML) symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing (OFDM) systems. Redundant information contained within the cyclic prefix enables this estimation without additional pilots. Simulations show that the frequency estimator may be used in a tracking mode and the time estimator in an acquisition mode. 
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References

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