Signature matching for location determination in wireless communication systems
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United States of America Patent
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Aug 22, 2000
Issued Date -
N/A
app pub date -
Feb 18, 1998
filing date -
Jan 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus improves the accuracy of a wireless location finding system based on the use of multipath signal signatures. A location finding apparatus measures an array covariance matrix R of a signal. The covariance matrix is compared to a database of signatures comprising calibrated signal subspaces. The comparison is based on calculating the projection of R onto each calibrated subspace. From these calculations a set of likely locations is then determined.
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