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:
Mar. 14, 2006
Filed:
Apr. 27, 2002
David Bruce Isaksen, Mountain View, CA (US);
Byron Esten Danzer, Aptos, CA (US);
Mark Fong, Cupertino, CA (US);
David Bruce Isaksen, Mountain View, CA (US);
Byron Esten Danzer, Aptos, CA (US);
Mark Fong, Cupertino, CA (US);
Wideband Semiconductors, Inc., Mountain View, CA (US);
Abstract
In a system comprising a subscriber (sub) carrier tracking loop and a hub carrier tracking loop, a method and apparatus for resolving phase equivocation. The method comprises the following steps: (A) acquiring a phase and a frequency of a hub carrier frequency by utilizing the sub carrier tracking loop; (B) estimating an instant absolute frequency offset between a received symbol point and a corresponding plant point; (C) averaging the instant absolute frequency offset over a plurality of received symbols; (D) storing the averaged estimated frequency offset in a frequency register of the sub carrier tracking loop; (E) locking the sub carrier tracking loop on the hub carrier frequency by compensating for the stored averaged estimated frequency offset; (F) estimating an instant absolute phase error between a received symbol point and a corresponding plant point; (G) averaging the instant absolute phase error over a plurality of received symbols; (H) resolving phase equivocation by adjusting the averaged absolute phase error, if the averaged absolute phase error is at least equal to a predetermined equivocation phase threshold; and (I) completing the tracking of the hub carrier frequency by the locked sub carrier tracking loop.