MATLAB Coder for FSK Demodulation
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Hello,
I am trying to generate c code for FSK Modulation and Demodulation. Following is my function for code generation:
function [modSignal,receivedData,errorStats] = test_my_FSK(data)
%#codegen
M = 4;
freqSep = 100;
fskMod_M = comm.FSKModulator(M,freqSep,'BitInput',true);
fskDemod_M = comm.FSKDemodulator(M,freqSep,'BitOutput',true);
err = comm.ErrorRate;
modSignal = zeros((fskMod_M.SamplesPerSymbol*(length(data)/2)),1)+0i;
receivedData = zeros(length(data),1);
errorStats = zeros(3,1);
for counter = 1:10
modSignal = step(fskMod_M,data);
receivedData = step(fskDemod_M,modSignal);
errorStats = step(err,data,receivedData);
end
end
In the above function, you can observe that I have both FSK modulation and Demodulation. I have no issues converting the modulation part into mex, but when it comes to demodulation it throws the following error:
![Matlab Coder Error.JPG](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239297/Matlab%20Coder%20Error.jpeg)
I was successful in generating mex for just the modulation part, only when I include the demodulation part it fails. Kindly advise.
Also, I observed that,
class for FSK Modulation :
![FSK_Mode_Class_Type.JPG](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239298/FSK_Mode_Class_Type.jpeg)
Whereas that of the demodulator is,
![demod_type.JPG](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239299/demod_type.jpeg)
I have checked MATLAB documentation for comm.FSKDemodulator, it says it is supported for C code generation.
Your help will be greatly appreciated. Kindly advise
2 Comments
Denis Gurchenkov
on 24 Sep 2019
This looks like a bug. Can you please attach all the files you have been using (the .m file and .prj file) and also specify what release of MATLAB you are using and what platform?
Accepted Answer
Vivek Selvam
on 24 Sep 2019
Hi Mounika,
Code generation is successful when using Name-Value pairs for comm.FSKDemodulator as follows:
fskDemod_M = comm.FSKDemodulator('ModulationOrder',M,'FrequencySeparation',freqSep,'BitOutput',true);
The equivalent Simulink blocks (M-FSK Modulator Baseband and M-FSK Demodulator Baseband) support C code generation:
>> web(fullfile(docroot, 'comm/ref/mfskmodulatorbaseband.html'))
>> web(fullfile(docroot, 'comm/ref/mfskdemodulatorbaseband.html'))
Thanks for reporting this bug.
/Vivek
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