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:
Dec. 25, 2001
Filed:
Sep. 04, 1998
Tetsuya Miura, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A CDMA receiving apparatus which can accurately perform phase tracking for a reception signal even under an environment wherein the reception delay amount varies in a period shorter than the processing time of a synchronization detection and phase tracking section. The CDMA receiving apparatus includes a plurality of FINGER processing sections individually provided for a plurality of paths and including de-spreading sections for receiving a signal spread with a spread code and arriving through the paths and de-spreading the reception signal with a de-spread code and channel estimation sections for estimating the paths based on results of the processing of the de-spreading sections, and a synchronization detection and phase tracking section for outputting a reception delay amount of the reception signal in a predetermined period to the de-spreading sections. Each de-spreading section includes a plurality of correlators for individually correcting, when the reception delay amounts are received, the reception delay amounts and performing de-spreading processing. Each channel estimation section includes level measurement sections for individually measuring correction value levels of the correlators, a level comparison section for comparing the measurement levels, and a path change-over section for selecting the correlation magnitude of that one of the correlators which is detected to output the highest measurement level.