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. 05, 2005
Filed:
Feb. 26, 2001
Masahiro Komatsu, Tokyo, JP;
Masahiro Komatsu, Tokyo, JP;
Nec Corporation, Tokyo, JP;
Abstract
An object of the present invention is to estimate and compensate more accurately transmission channels in CDMA signal decoding. Memory means stores received despread data. Slot position detection means detects positions of pilot symbols. Pilot symbol averaging means obtains transmission channel estimation value per pilot block, by averaging a plurality of reception channels in each pilot block. The transmission channel estimation values are delayed by delay means, multiplied by their weight and added by multi-pilot block transmission channel estimation means. Here, the weighs are controlled adaptively by weight determination means in accordance with the state of the channel. Channel compensation means compensate m-th information symbol in the n-th slot including the pilot block on the basis of the estimation values obtained by the multi-pilot block transmission channel estimation means.