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:
Nov. 09, 2004
Filed:
Sep. 05, 2000
Akira Shibuta, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A spread spectrum communications apparatus for synchronizing a received spread spectrum modulated signal and a de-spreading code, and its synchronization acquisition method are disclosed. In the first synchronization acquisition operation, the phase of the de-spreading code is sequentially changed finely depending on the number of chips, and the correlation value of the spread spectrum modulated signal and de-spreading code is detected. Further, the maximum value and average of the correlation value for the number of times of detection are determined. When the maximum value is judged to be larger than the sum of the average and a specified threshold level, the first acquisition operation is completed. Consequently, the process is advanced to a second synchronization acquisition operation for determining the phase for establishing the synchronization by changing finely the phase of the de-spreading code before and after the phase corresponding to the maximum value.