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:
Feb. 21, 2006
Filed:
Feb. 04, 2002
Selection of multiple propagation paths by successive removal and detection of high autocorrelations
Naohiko Sugita, Tokyo, JP;
Naohiko Sugita, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a spread spectrum receiver, a received signal is despread by a correlator to produce multiple delay profiles, or a sum of autocorrelations, corresponding to multiple propagation paths of the signal. Subtractors are connected in successive stages from the output of the correlator. Corresponding to the subtractors, path searchers are connected to successive taps of the subtractors for respectively detecting the delay profiles produced by the correlator. In each subtractor the output of the corresponding path searcher is subtracted from the output of the subtractor of preceding stage. RAKE fingers are provided for despreading the received signal at delay times respectively determined by the delay profiles detected by the path searchers. The despread signals are maximal-ratio combined.