ML estimation of time and frequency offset in OFDM systems

  • Authors:
  • J.J. van de Beek;M. Sandell;P.O. Borjesson

  • Affiliations:
  • Div. of Signal Processing, Lulea Univ. of Technol.;-;-

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 1997

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Abstract

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