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How to analyze signal and make proper filter?

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fer jozef
fer jozef 2021 年 1 月 10 日
編集済み: Birdman 2021 年 1 月 13 日
I don't know how to analyze this signal and use proper filter for it. I work in matlab, function sptool. I don't know how to identify modulation pulse length, characteristic interval length, modulation signal frequency, carrier signal, modulation signal type, modulation type. Also, I don't know how to do time analyzation and power analyzation. Signal15.mat is the file
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fer jozef
fer jozef 2021 年 1 月 12 日
Oh, i am just testing it, but i don't know what type of modulation it could be. I wonder, if it is not FM, but i could be PSK too.

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回答 (1 件)

Birdman
Birdman 2021 年 1 月 13 日
編集済み: Birdman 2021 年 1 月 13 日
If you want to have a starting point, following code basically takes the psd of the signal, so that you will be able to obtain the frequency characteristics of your signal:
h1=spectrum.welch;
set(h1,'Windowname','Hann');
Fs=10000;%sampling frequency of your signal
set(h1,'OverlapPercent','66.7');
set(h1,'SegmentLength','512');
myPsd=psd(h1,simout-mean(simout),'Fs',Fs);
semilogx(myPsd.Frequencies,myPsd.Data);xlabel('Hz');
After this, you can apply the necessary filter or do any kind of operation based on your need.

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