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:
May. 29, 2007
Filed:
Jul. 22, 2003
Yasuyuki Oishi, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Yoshihiko Asano, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Yoshihiko Asano, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention reduces the scale of circuitry and shortens the code phase detection time needed to achieve initial synchronization. In a correlator for calculating correlation between a received spreading code contained in a received spread-spectrum signal and a reference spreading code, a combined code generator is included. The combined code generator outputs a combined spreading code by weighting and combining a plurality of phase-shifted reference spreading codes A–A. Further, an arithmetic circuit calculates correlation between the received spreading code and the plurality of phase-shifted reference spreading codes simultaneously. A phase detection circuit detects the phase difference between the received spreading code and a reference spreading code, namely the phase of the received spreading code from the results of the arithmetic operation.