OFDM pilot tone tracking for wireless LAN

  • US 6,633,616 B2
  • Filed: 08/21/2001
  • Issued: 10/14/2003
  • Est. Priority Date: 02/21/2001
  • Status: Expired due to Term
First Claim
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1. A pilot phase error metric for an orthogonal frequency division multiplexed (OFDM) receiver comprising:

  • a discrete Fourier transform portion for receiving an incoming signal corresponding to an OFDM waveform, wherein the discrete Fourier transform portion outputs complex signal measurements corresponding to each of a plurality of pilots of a preamble portion of the OFDM waveform and complex signal measurements corresponding to each of a plurality of pilots of a subsequent OFDM symbol of the OFDM waveform, wherein the discrete Fourier transform portion is separate from a fast Fourier transform operation of the OFDM receiver;

    a maximum likelihood phase error/weighting processor coupled to the discrete Fourier transform portion for processing the complex signal measurements corresponding to each of the plurality of pilots of the subsequent OFDM symbol in comparison to pilot reference points; and

    a phase error estimator coupled to the maximum likelihood phase error/weighting processor for estimating a phase error of the subsequent OFDM symbol relative to a phase corresponding to the preamble portion based on the processed complex signal measurements and the pilot reference points.

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