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Matched filter

A technology of matched filter and sample-and-hold circuit, which is applied in the field of matched filter to achieve the effect of improving operation speed and high operation speed

Inactive Publication Date: 2003-01-29
YOZAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To eliminate such charges, it is necessary to short-circuit the capacitor part and perform a so-called refresh. However, since the calculation must be stopped during this refresh, the overall calculation speed must be sacrificed.

Method used

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Examples

Experimental program
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Embodiment

[0029] in figure 1 Among them, the matched filter has the same main sample-and-hold circuit SHm as the existing sample-and-hold circuit (multiple S / Hs in FIG. 17), but also has auxiliary sample-and-hold circuits SHa, SHb, and these auxiliary sample-and-hold circuits It has the function of separately holding one piece of data that should be held in the main sample-and-hold circuit. That is, the auxiliary sample and hold circuit is a circuit that can replace the function of a unit sample and hold circuit in the main sample and hold circuit. Therefore, the unit sample and hold circuits in the main sample and hold circuit can be stopped in sequence. In addition, since two auxiliary sample-and-hold circuits SHa and SHb are provided, one of them can be stopped.

[0030] The outputs of the main and auxiliary sample and hold circuits SHm and SHa are input to the first addition and subtraction circuit ADD1, and the outputs of SHm and SHb are input to the second addition and subtraction ci...

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Abstract

The present invention has an object to provide a matched filter in which the total circuit can be refreshed without decreasing the calculation speed. In a matched filter according to the present invention, it is additionally settled that, a plurality of auxiliary sampling and holding circuits for holding a part of analog input voltage to be held in the main sampling and holding circuit; the second addition and subtraction circuit including a circuit equivalent to addition and subtraction circuit; a multiplexer for alternatively outputting an output of addition and subtraction circuit or the second addition and subtraction circuit. Consequently, a period is settled for stopping a sampling and holding circuit and addition and subtraction circuit in the main sampling and holding circuit; a refresh is performed in the period.

Description

Technical field [0001] The present invention relates to a matched filter effective in a spectrum diffusion communication system such as mobile communication or wireless LAN, and relates to a matched filter provided with a main sample-and-hold circuit and an addition and subtraction circuit. The main sample-and-hold circuit has a plurality of sample-and-hold circuits for holding time-series analog input voltages and outputting the held analog input voltages as outputs of different paths according to the value of the PN code. The addition and subtraction circuit includes The first step of adding the output of the path corresponding to the sign of the PN code in the output of the sample-and-hold circuit as described above (taking "1" and "0" as "+1" and "-1") A second adder and a subtractor that subtracts the output of the second adder from the output of the first adder. Background technique [0002] Regarding this kind of matched filter, the applicant proposed a matched filter in t...

Claims

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Application Information

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IPC IPC(8): H04J13/00G11C27/02H03H11/04H03H17/02H04B1/7093
CPCH03H17/0254H03H11/04
Inventor 寿国梁周长明山本诚高取直
Owner YOZAN