RF fingerprinting for location estimation
First Claim
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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Accused Products
Abstract
The location of a terminal is estimated within an area of coverage of a wireless network comprising at least one fixed node by 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.
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Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of compiling survey data for use in the 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:
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measuring a complex frequency response of a radio channel between a measurement node and one of said fixed nodes at a plurality of different locations within the network; and deriving data representing a metric of each measured complex frequency associated with each of the plurality of different locations; storing the derived data for each of said plurality different locations together with an indication of the location within the network to which said metric relates, wherein said metric is an autocorrelation function. - View Dependent Claims (11, 12, 13)
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14. A processor arranged to estimate a location of a terminal within an area of coverage of a wireless network comprising at least one fixed node,
wherein the processor is arranged to receive a measurement of a complex frequency response of a radio channel between the terminal and one of said fixed nodes, and the processor is arranged to estimate 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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18. A non-transitory computer readable medium encoded with computer executable instructions for causing a processor to estimate a location of a terminal within an area of coverage of a wireless network comprising at least one fixed node by
receiving a measurement of 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.
Specification