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[SOLVED] FSK demodulation poblem.

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hamidkavianathar

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I want to simulate the FSK demodulator. these are my parameters:
F1 = 16.5 kHz - 64 Hz, F2 = 16.5 kHz + 64 Hz.
as the difference between F1 and F2 is very small, I can't extract my data correctly. Can someone guide me?
thanks.
 

How are you extracting the data?

thanks for the comment. this is my algorithm:
Capture.PNG

I have simulated it in MATLAB/simulink environment.
 

What's the timing of the accumulator control signals?

Summing quadrature magnitudes doesn't give the absolute magnitude, need to calculate squared sum.
 
What's the timing of the accumulator control signals?
Summing quadrature magnitudes doesn't give the absolute magnitude, need to calculate squared sum.

thanks for your attention and your help.
I think calculated the sum in this block diagram:
Capture2.PNG
Capture3.PNG
and I have illustrated my signals in this image:
Capture4.PNG

in the above image F1 = 16564Hz , F2 = 1643 Hz. the difference between F1 and F2 is very high, but I couldn't retrieve my data.
 

Squaring the product before accumulator can't be right.

thank you. You helped me very much. I have no idea how I can thank you.:clap:
you're right. I modified it and it according what you said and now it works very well.
I want to ask you another question, do you know how i can make it robuster? I have not consider the distortions.
 
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