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Method and apparatus for tracking a synchronization signal

  • US 7,012,937 B2
  • Filed: 01/24/2001
  • Issued: 03/14/2006
  • Est. Priority Date: 06/26/2000
  • Status: Expired due to Term
First Claim
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1. A method of determining a frequency at which a terminal transmits a transmission signal, said terminal comprising a receiver including a delay lock loop circuit, the method comprising:

  • receiving an input signal at said receiver;

    sampling said signal at a clock rate to generate signal samples;

    providing said signal samples to said delay lock loop circuit, wherein said delay look loop circuit comprises at least a third order loop and a low order gain loop;

    controlling said delay lock loop circuit to provide an output representing a phase delay of the received signal, and initially using said low order gain loop and subsequently using said at least third order loop to provide said output;

    adjusting the clock rate based on said phase delay;

    determining said frequency at which said terminal transmits said transmission signal based on said phase delay; and

    determining a difference between said frequency and an expected frequency; and

    wherein the step of controlling said delay lock loop further comprises using said low order gain loop until said difference is less than a threshold value, and subsequently using said at least third order loop.

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