OFDM pilot tone tracking for wireless lan

  • US 20020159533A1
  • Filed: 08/21/2001
  • Published: 10/31/2002
  • Est. Priority Date: 02/21/2001
  • Status: Active Grant
First Claim
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1. A pilot phase tracking loop for an orthogonal frequency division multiplexed (OFDM) receiver comprising:

  • a phase rotator for receiving and phase de-rotating an incoming signal;

    a fast Fourier transform coupled to an output of the phase rotator for processing a signal output from the phase rotator;

    a pilot phase error metric including a discrete Fourier transform portion, the discrete Fourier transform portion coupled to the output of the phase rotator, wherein the pilot phase error metric determines a phase error estimate associated with a received OFDM symbol of the signal output from the phase rotator;

    a loop filter coupled to an output of the pilot phase error metric; and

    an oscillator coupled to an output of the loop filter and having an output coupled to the phase rotator such that the phase rotator adjusts the phase of subsequent OFDM symbols of the incoming signal arriving after the received OFDM symbol by the phase error estimate.

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