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:
Apr. 10, 2012
Filed:
Jun. 26, 2008
Kaoru Kobayashi, Chitose, JP;
Shigeru Takegishi, Chitose, JP;
Kaoru Kobayashi, Chitose, JP;
Shigeru Takegishi, Chitose, JP;
Nihon Dempa Kogyo Co., Ltd, Tokyo, JP;
Abstract
Provided is a matched filter whose circuit scale can be made significantly smaller by reducing the number of multipliers for a despreading process and the number of adders for an accumulating process. For each in-phase/orthogonal component, the matched filter includes a dual-port RAM that separates written samples into 128 groups each of 32 samples which are collectively read out group by group in order at a speed faster than a write speed in write mode, a bit separating section that separates data read group by group into 32 samples and simultaneously outputs the 32 samples, and 32 despreading/accumulating circuits that, with 16 samples sequentially input from 16 groups being taken as one block, sequentially despread individual samples, accumulate despreading results, and output accumulated values for each block. The matched filter further includes an accumulating section that accumulates absolute values for each block from in-phase/orthogonal outputs of the despreading/accumulating circuits, and outputs correlation value data.