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Timing offset error extraction method and apparatus

  • US 5,818,872 A
  • Filed: 12/31/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 12/31/1996
  • Status: Expired due to Term
First Claim
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1. A method for correcting for timing offset between a transmitter clock and a receiver clock when determining signal to noise ratio spectrum for a communications channel, comprising the steps of:

  • generating a training signal at the transmitter;

    transmitting the training signal over the communications channel;

    receiving the training signal at the receiver;

    generating an estimated spectrum of the received training signal;

    estimating a timing offset between the first clock of the transmitter and the second clock of the receiver;

    generating a fourier transform of the received training signal;

    circularly convolving the fourier transform of the received training signal with a fourier transform of a periodic ramp function to produce an error spectrum; and

    subtracting the error spectrum from the estimated spectrum of the received training signal to produce a corrected spectrum of the received training signal corrected for timing offset between the first clock of the transmitter and the second clock of the receiver.

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