Subspace signature matching for location ambiguity resolution in wireless communication systems
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United States of America Patent
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May 16, 2000
Issued Date -
N/A
app pub date -
Aug 20, 1998
filing date -
Jan 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus reduces the ambiguities in the determination of cellular telephone locations in a location finding system based on the use of multipath signals. A location finding base station determines a signal signature from a subspace of an array covariance matrix. The signature is compared to a database of calibrated signal signatures and corresponding locations, and a set of likely locations whose calibrated signatures best match the measured signature is selected. A subset of most likely locations is selected from among the likely locations by comparing a function which represents how closely the measured signature matches the set of calibrated signatures with functions which represent how closely each likely signature matches the set of calibrated signatures. The locations corresponding to the best matching function are selected.
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