Digital matched filter
First Claim
Patent Images
1. A digital matched filter comprising:
- frequency converting means for converting a received signal in frequency into a base band by using a signal having a same frequency as a carrier of the received signal;
A/D converting means for converting a signal obtained by the frequency conversion into a multi-bit signal;
a plurality of digital correlators for correlating different bit signals of said multi-bit signal with a set signal to output respective correlation values;
a plurality of weighting means for weighting differently outputs of the different correlators;
synthesizing means for combining outputs of said weighting means;
a judging circuit for comparing an output of said synthesizing means with a predetermined value to output a control signal, based on a comparison result thus obtained; and
control means for varying weighting factors, based on said control signal.
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Abstract
In a digital matched filter used as a correlator in a receiver in an SSC system, different bits of a received signal converted into a multi-bit signal are inputted into different correlators. After having weighted different correlation outputs, the different weighted correlation outputs are added together and weighting factors are varied, depending on a synthesized correlation output obtained by addition. When such a matched filter is used in an SSC system, it is possible to obtain precisely a desired signal without controlling transmission electric power.
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4 Claims
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1. A digital matched filter comprising:
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frequency converting means for converting a received signal in frequency into a base band by using a signal having a same frequency as a carrier of the received signal; A/D converting means for converting a signal obtained by the frequency conversion into a multi-bit signal; a plurality of digital correlators for correlating different bit signals of said multi-bit signal with a set signal to output respective correlation values; a plurality of weighting means for weighting differently outputs of the different correlators; synthesizing means for combining outputs of said weighting means; a judging circuit for comparing an output of said synthesizing means with a predetermined value to output a control signal, based on a comparison result thus obtained; and control means for varying weighting factors, based on said control signal. - View Dependent Claims (2, 3, 4)
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Specification