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:
Oct. 14, 2008
Filed:
Sep. 30, 2004
Teresa E. Fisher, Huntsville, AL (US);
Jennifer P. Rolin, Elkmont, AL (US);
Irina Dodoukh, Huntsville, AL (US);
Vernon R. Brethour, Owens Cross Roads, AL (US);
Mark Roberts, Huntsville, AL (US);
James Richards, Fayetteville, TN (US);
Teresa E. Fisher, Huntsville, AL (US);
Jennifer P. Rolin, Elkmont, AL (US);
Irina Dodoukh, Huntsville, AL (US);
Vernon R. Brethour, Owens Cross Roads, AL (US);
Mark Roberts, Huntsville, AL (US);
James Richards, Fayetteville, TN (US);
Time Domain Corporation, Hunstville, AL (US);
Abstract
An ultra wideband system employing a threshold to detect signal quality during acquisition wherein the threshold is adjusted based on signal characteristics such as packet traffic rate, packet loss rate, and packet loss fraction. In one embodiment, the threshold is adjusted by adjusting the gain of a variable gain stage ahead of the threshold. In another embodiment, gain and threshold are adjusted in a coordinated manner wherein gain is adjusted for low signal levels and threshold is adjusted for high signal levels. In one embodiment, packet traffic rate is evaluated over an interval based on maximum packet length, number of monitor packets, and inter-packet delay. In a further embodiment, multiple ramp builders are operated in parallel at multiple code offset values to generate signal statistics to compare with the threshold. Embodiments are disclosed wherein the thresholds are adaptively adjusted based on signal performance characteristics or the multipath environment.