AM DEMODULATOR WITHOUT USING AMDEMOD FUNCTION

Question

pss aditya 2020-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/581699-am-demodulator-without-using-amdemod-function

回答： Darel 2021-7-13

采纳的回答： Darel

how do we write a code for am demodulator without using amdemod function?

i want to write the codes without the predefined functions.

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Answer 1

Darel 2021-7-13

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https://ww2.mathworks.cn/matlabcentral/answers/581699-am-demodulator-without-using-amdemod-function#answer_746073

If you want your own version of amdemod but want to use it as "inspiration" for your own, you can open amdemod.m in the editor or step into it in the debugger to see how amdemod works and then build something similar, as you like.

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Answer 2

Dinesh Yadav 2020-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/581699-am-demodulator-without-using-amdemod-function#answer_484625

在 MATLAB Online 中打开

If you want to write code for demodulation without using amdemod, then you need to first select which method are you going to use for demodulation: Envelope Detector , Square law demodulator etc.

Assuming you select Square law Detector, you have a AM equation of form

V(t) = A(1+km(t))cos(2*pi*fc*t);

need to mathematically model the behaviour of square law device into equations of form

Vsq(t)= k1V(t) + k1(V(t)*V(T)) + ...

then you need to mathematically model a low pass filter and pass the signal through it(model this behaviour either by convolution or convert to frequency domain and multiply both filter response and Square law output and then inverse fourier to get time domian signal) to get AM output.