Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2003-02-04
2008-12-02
Jain, Raj K (Department: 2616)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S311000, C370S328000, C370S331000, C370S333000, C370S334000, C455S456100, C455S456200, C455S456500, C455S456600
Reexamination Certificate
active
07460505
ABSTRACT:
A method of estimating the location of a wireless terminal is disclosed that is ideally suited for use with legacy systems. The illustrative embodiment of the present invention is based on the observation that the signal strength of a signal from a transmitter is different at some locations, and, therefore, the location of a wireless terminal can be estimated by comparing the signal strength it currently observes against a map or database that correlates locations to signal strengths. For example, if a particular radio station is known to be received well at a first location and poorly at a second location, and a given wireless terminal at an unknown location is receiving the radio station poorly, it is more likely that the wireless terminal is at the second location than it is at the first location.
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DeMont & Breyer LLC
Jain Raj K
Polaris Wireless, Inc.
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