The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2007
Filed:
Dec. 27, 2002
Youngjune Lee Gwon, Mountain View, CA (US);
Ravi Kumar Jain, Mountain View, CA (US);
Toshiro Kawahara, Saratoga, CA (US);
Youngjune Lee Gwon, Mountain View, CA (US);
Ravi Kumar Jain, Mountain View, CA (US);
Toshiro Kawahara, Saratoga, CA (US);
NTT DoCoMo, Inc., Tokyo, JP;
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.