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Method and apparatus for detecting excess delay in a communication signal

  • US 6,941,144 B2
  • Filed: 09/14/2001
  • Issued: 09/06/2005
  • Est. Priority Date: 09/14/2001
  • Status: Active Grant
First Claim
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1. A method of determining location of a mobile unit, the method comprising:

  • receiving signals from at least two base stations;

    determining a time difference of arrival between the received signals;

    estimating a lower bound of excess delay in accordance with the time of arrival of the signals and known distances between the base stations, wherein estimating the lower bound of excess delay is done with less than all of the signals received from the base stations; and

    estimating a location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals.

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