Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-08-14
2007-08-14
Nguyen, Duc M. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S456300, C455S115100, C455S115300, C455S226100
Reexamination Certificate
active
10330523
ABSTRACT:
In an RF environment serviced by 802.11, Bluetooth(™), or other network transmitters, or combinations, location-estimation methods and systems can advantageously use redundancy to refine an estimated location of an RF receiver. In one embodiment, a method for finding a receiver's location includes receiving signals from fixed transmitters, calculating preliminary location estimates, and combining the estimates using predetermined reference information on the RF environment. The reference information preferably includes minimum mean-squared error optimizing coefficients.
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Gwon Youngjune Lee
Jain Ravi Kumar
Kawahara Toshiro
Kwok Edward C.
MacPherson Kwok & Chen & Heid LLP
Nguyen Duc M.
NTT DoCoMo Inc.
Phuong Dai
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