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:
May. 24, 2005
Johnny M. Harris, Centerville, UT (US);
Samuel C. Kingston, Salt Lake City, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
Eric K. Hall, Holliday, UT (US);
Richard B. Ertel, Midvale, UT (US);
Johnny M. Harris, Centerville, UT (US);
Samuel C. Kingston, Salt Lake City, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
Eric K. Hall, Holliday, UT (US);
Richard B. Ertel, Midvale, UT (US);
L-3 Communications Corporation, New York, NY (US);
Abstract
A matched filter decorrelator is described for efficiently performing a carrier frequency search while despreading a P/N long code constructed from two or more constituent codes such as codes A, B, C. The received signal is phase rotated into a frequency bin and partially despread, preferably over all but one of the constituent codes. To despread the final constituent code, the partially despread signal is input in parallel into frequency bins, where a phase rotator sets each input to a different bin. The frequency bins are then despread in parallel over the final constituent code, and an energy peak in one accumulator indicates which bin is the carrier frequency. Alternatively, a Fourier transform could be used over each of the frequency bins. By partially despreading prior to division into carrier frequency bins, hardware and computational burden are reduced as compared to prior art decorrelators. The present invention is particularly apt for use with an acquisition burst in a secure network.