Matched filter circuit and correlation calculation method

Details Matched filter circuit and correlation calculation method Matched filter circuit and correlation calculation method

2004-10-22

2008-09-09

Payne, David C. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S150000, C375S143000, C375S137000, C375S130000

Reexamination Certificate

active

07424050

ABSTRACT:
There are provided input route selecting means711-713and723-725for selecting, in accordance with the oversampling phase, input routes along which reception data and codes are to be input to individual shift register means, a plurality of data shift register means707-710that are caused by the input route selecting means to operate in groups corresponding to respective oversampling phases, code shift register means719-722corresponding to the respective data shift register means707-710,and despreading integration calculating means702and704.Correlation calculations are performed while reception data are stored in the tap groups efficiently, whereby the search window width is increased when the oversampling setting number is low. Further, the power consumption is reduced by lowering the shift frequency of the shift register means.

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