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:
Sep. 04, 2012
Filed:
Jul. 31, 2009
Ronggang Qi, Ashburn, VA (US);
Christopher D. Gregory, Potomac Falls, VA (US);
Baoyan Ding, Rockville, MD (US);
Shanmugavel Sivagnanavelu, Bristow, VA (US);
Ronggang Qi, Ashburn, VA (US);
Christopher D. Gregory, Potomac Falls, VA (US);
Baoyan Ding, Rockville, MD (US);
Shanmugavel Sivagnanavelu, Bristow, VA (US);
VT Idirect, Inc., Herndon, VA (US);
Abstract
An apparatus and method to optimize recovery of the carrier frequency performs independent optimization of frequency capture range and carrier frequency estimation accuracy. A multi-correlator selects a frequency-shifted version of a signal of interest, extracted from a received signal, to output a coarse frequency-shifted version of the signal of interest. A fine frequency estimator shifts a frequency of the coarse frequency-shifted version of the signal of interest, based on a frequency corresponding to the spectral peak of the coarse frequency-shifted version of the signal of interest, and generates a fine frequency-shifted version of the signal of interest. A fine frequency estimator generates an intermediate frequency estimate and a plurality of phase estimates, based on the coarse frequency-shifted version of the signal of interest, resolves phase ambiguities in the plurality of phase estimates based on the intermediate frequency estimate, and generates a fine frequency-shifted version of the signal of interest.