US 2004/0105418 A1 · Cdma reception apparatus and path protection method

Abstract

A path protection method for a CDMA reception apparatus is disclosed, which obtains correlation value levels while shifting the despreading timing of reception data little by little, searches for optimal reception timings, outputs a plurality of finger path timings, with respect to the reception data, as reception timings at which reception should be performed, and despreads the respective paths, thereby performing RAKE combining. If all protection paths are in the forward protection state upon execution of path backward protection and forward protection, a protection path with the lowest level is deleted, and a search path having the highest level among paths which are equal to or more than a threshold and detected by a searcher is registered in the deleted portion, thereby allowing assignment of a newly detected path even in the absence of a protection path space.

Claims19

Dependent claims

A CDMA reception apparatus characterized by comprising:

a finger section having a plurality of finger circuits which despread paths of input CDMA (Code Division Multiple Access) reception data at reception timings designated by finger path timings, perform symbol synchronization, and output finger outputs;
a searcher section which obtains correlation value levels while shifting a despreading timing of the reception data little by little, searches for optimal reception timings, and outputs, to the plurality of finger circuits, the plurality of finger path timings as reception timings at which the data should be received by said finger section;
a RAKE combining section which adds and in-phase combines outputs from said finger section to output RAKE combined data;
and
a decoding section which decodes the RAKE combined data and outputs decoded data.

2 more elements

A path protection method for a CDMA reception apparatus, characterized in that correlation value levels are obtained while a despreading timing of reception data is shifted little by little, optimal reception timings are detected, a plurality of finger path timings are output, with respect to the input reception data, as reception timings at which reception should be performed, the respective paths are despread, a plurality of finger outputs are output upon symbol synchronization, the outputs are added and in-phase combined to output RAKE combined data, the RAKE combined data is decoded, and decoded data is output.

Dependencies are inferred from the claim text.

Cdma reception apparatus and path protection method

Life of this patent

Cdma reception apparatus and path protection method

Life of this patent

Abstract

Claims19