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RF fingerprinting for location estimation

  • US 8,170,815 B2
  • Filed: 06/08/2009
  • Issued: 05/01/2012
  • Est. Priority Date: 06/08/2009
  • Status: Active Grant
First Claim
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1. A method of estimation of a location of a terminal within an area of coverage of a wireless network comprising at least one fixed node, the method comprising:

  • measuring a complex frequency response of a radio channel between the terminal and one of said fixed nodes; and

    estimating the location of the terminal on the basis of at least a comparison between data representing a first metric of the measured complex frequency response and data representing a plurality of stored metrics,each of said plurality of stored metrics being related to one of a plurality of different locations within the network and each stored metric being of a complex frequency response measured between the said one of said fixed nodes and the location within the network to which the metric relates,wherein the first metric and the plurality of stored metrics are autocorrelation functions.

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