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:
Jun. 24, 2008
Filed:
Mar. 06, 2007
Zhigang Gao, Richfield, OH (US);
Paul Stager, Cuyahoga Falls, OH (US);
Bretton Douglas, San Jose, CA (US);
Brian Hart, Sunnyvale, CA (US);
James Amos, North Canton, OH (US);
Yoonill Lee, Medina, OH (US);
Zhigang Gao, Richfield, OH (US);
Paul Stager, Cuyahoga Falls, OH (US);
Bretton Douglas, San Jose, CA (US);
Brian Hart, Sunnyvale, CA (US);
James Amos, North Canton, OH (US);
Yoonill Lee, Medina, OH (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
In an example embodiment, a time of arrival circuit coupled to a wireless transceiver configured to determine a time of arrival of a wireless signal. The time of arrival circuit is operative to perform a coarse-scale frequency domain correlation of the actual samples with a predetermined ideal sample. The time of arrival circuit determines a maximum coarse correlation coefficient. The time delay circuit is operative to determine a plurality of fine correlation coefficients by interpolating around the peak coarse correlation coefficient. The time of arrival circuit determines a maximum correlation coefficient from the plurality of fine correlation coefficients and a time delay associated with the maximum correlation coefficient, the time of arrival is based on the time delay associated with the maximum correlation coefficient.