Method and system for creating a radio frequency signature for a signature region in a coverage area of a wireless communication system
First Claim
1. A method for creating a radio frequency signature for a signature region in a coverage area of a wireless communication system, the method comprising the steps of:
- measuring radio frequency signal propagation characteristics associated with a signal transmitted from a plurality of locations in the coverage area of the wireless communication system;
defining a plurality of signature regions in the coverage area that contain selected locations having selected measured radio frequency signal propagation characteristics;
for a selected signature region, processing the selected measured radio frequency signal propagation characteristics within the selected signature region to produce a spatially averaged radio frequency signature for the selected signature region, wherein the processing extracts the dominant features of the radio frequency signal propagation characteristics of a signal transmitted within the selected signature region; and
recording an association between the spatially averaged radio frequency signature and the selected signature region.
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Abstract
In a wireless communication system, radio frequency signal propagation characteristics associated with a signal transmitted from several locations in the coverage area of the wireless communication system are measured. Next, a plurality of signature regions are defined in the coverage area, wherein the signature regions each contain several selected locations having selected measured radio frequency signal propagation characteristics. For a selected signature region, the associated measured radio frequency signal propagation characteristics are processed to produce a spatially averaged radio frequency signature for the selected signature region. The spatially averaged radio frequency signature represents the dominant features of the radio frequency signal propagation characteristics of a signal transmitted within the selected signature region. Finally, an association between the spatially averaged radio frequency signature and the selected signature region is recorded.
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Citations
12 Claims
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1. A method for creating a radio frequency signature for a signature region in a coverage area of a wireless communication system, the method comprising the steps of:
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measuring radio frequency signal propagation characteristics associated with a signal transmitted from a plurality of locations in the coverage area of the wireless communication system;
defining a plurality of signature regions in the coverage area that contain selected locations having selected measured radio frequency signal propagation characteristics;
for a selected signature region, processing the selected measured radio frequency signal propagation characteristics within the selected signature region to produce a spatially averaged radio frequency signature for the selected signature region, wherein the processing extracts the dominant features of the radio frequency signal propagation characteristics of a signal transmitted within the selected signature region; and
recording an association between the spatially averaged radio frequency signature and the selected signature region. - View Dependent Claims (2, 3, 4, 5, 6)
performing an eigendecomposition on the structured matrix containing vector representations of the signal propagation characteristics to produce a plurality of eigenvectors and their corresponding eigenvalues; and
selecting N of the eigenvectors that correspond to the N largest eigenvalues.
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5. The method for creating a radio frequency signature according to claim 1 wherein the step of measuring radio frequency signal propagation characteristics associated with a signal transmitted from a plurality of locations in the coverage area of the wireless communication system further includes measuring radio frequency signal propagation characteristics in the form of an impulse response for a plurality of locations in the coverage area of the wireless communication system.
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6. The method for creating a radio frequency signature according to claim 5 wherein the step of implicitly measuring radio frequency signal propagation characteristics of an impulse response for a plurality of locations in the coverage area further includes measuring a power delay profile for a plurality of locations in the coverage area of the wireless communication system.
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7. A system for creating a radio frequency signature for a signature region in a coverage area of a wireless communication system comprising:
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means for measuring radio frequency signal propagation characteristics associated with a signal transmitted from a plurality of locations in the coverage area of the wireless communication system;
means for defining a plurality of signature regions in the coverage area that contain selected locations having selected measured radio frequency signal propagation characteristics;
means for processing the selected measured radio frequency signal propagation characteristics within a selected signature region to produce a spatially averaged radio frequency signature for the selected signature region, wherein the processing extracts the dominant features of the radio frequency signal propagation characteristics of a signal transmitted within the selected signature region; and
means for recording an association between the spatially averaged radio frequency signature and the selected signature region. - View Dependent Claims (8, 9, 10, 11, 12)
means for performing an eigendecomposition on the structured matrix containing vector representations of the signal propagation characteristics to produce a plurality of eigenvectors and their corresponding eigenvalues; and
means for selecting N of the eigenvectors that correspond to the N largest eigenvalues.
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11. The system for creating a radio frequency signature according to claim 7 wherein the means for measuring radio frequency signal propagation characteristics associated with a signal transmitted from a plurality of locations in the coverage area of the wireless communication system further includes means for measuring radio frequency signal propagation characteristics in the form of an impulse response for a plurality of locations in the coverage area of the wireless communication system.
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12. The system for creating a radio frequency signature according to claim 11 wherein the means for implicitly measuring radio frequency signal propagation characteristics of an impulse response for a plurality of locations in the coverage area further includes means for measuring a power delay profile for a plurality of locations in the coverage area of the wireless communication system.
Specification