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. 24, 2009
Filed:
Jul. 27, 2006
LI Fung Chang, Holmdel, NJ (US);
Kapil Chawla, Scotch Plains, NJ (US);
Nelson Sollenberger, Farmingdale, NJ (US);
Li Fung Chang, Holmdel, NJ (US);
Kapil Chawla, Scotch Plains, NJ (US);
Nelson Sollenberger, Farmingdale, NJ (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
A system and method for acquiring a transmitted spread-spectrum signal uses a matched filter configuration that is preferably employed as a Stagefilter in the second phase of an initial signal acquisition procedure performed in the receiver. In operation, a Stagefilter matches a sequence which is repeated a number of times according to a second sequence within a secondary synchronization sub-channel of the spread-spectrum signal. The Stagefilter of the invention then filters the output of the Stagefilter in order to recover a secondary synchronization code. The Stagefilters the output of the Stagefilter using three matched filters of its own. The first and second filters sample different taps of a sequence output from the Stagefilter. The third filter samples a predetermined number of taps overlapping taps for the first and second filters in a way that resolves ambiguities with respect to the identification of the sequence. The ambiguity resolution performed by the third filter improves the frequency offset robustness and thus the overall performance of the receiver.