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Synchronization techniques using an interpolation filter

  • US 6,560,276 B1
  • Filed: 09/25/1998
  • Issued: 05/06/2003
  • Est. Priority Date: 09/25/1998
  • Status: Expired due to Fees
First Claim
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1. A modem comprising:

  • a transmit engine that transmits samples to a host; and

    a receive engine to receive samples from a host, the receive engine including;

    an equalizer; and

    a synchronization recovery circuit, coupled to the equalizer, to estimate a frequency difference between a local sample clock and a remote sample clock, the synchronization recovery circuit including;

    a discrete Fourier transform (DFT) circuit, coupled to the equalizer, that transforms input signals received from one or more taps of the equalizer to generate the +B/4 and −

    B/4 spectral components of the DFT, where B equals the baud rate; and

    a comparator, coupled to the DFT, that measures the phase difference between the +B/4 and −

    B/4 components to produce a first signal indicative of the frequency difference between the local sample clock and the remote sample clock.

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