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Signature matching for location determination in wireless communication systems

  • US 6,108,557 A
  • Filed: 02/18/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 01/08/1997
  • Status: Expired due to Fees
First Claim
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1. In a system for wireless transmitter location finding, a method for calculating a set of likely locations of a transmitter, the method comprising:

  • (a) measuring at a base station a signal covariance R associated with the transmitter;

    (b) evaluating a function LR (i) comparing R with a calibrated subspace associated with a location index i;

    (c) evaluating a function LR.sbsb.k '"'"'(i) comparing Rk '"'"' with the calibrated subspace associated with location index i, where Rk '"'"' is a calibrated covariance associated with a location index k;

    (d) calculating a distance G between the functions LR and LR.sbsb.k '"'"'; and

    (e) selecting a set of location indices k such that the distance G between R and Rk '"'"' is small.

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