output argument not assigned during call error

Hi,

I need your help . I am working on Modulation Classification and I found a matlab tutorial about it using CNN classification algorithm.

https://www.mathworks.com/help/deeplearning/ug/modulation-classification-with-deep-learning.html

First I want to generate random data and waveform for each modulation type. I run the trainFirst.m and waveform.m , respectively. I have also getModulator.m, getSource.m and helperModClassFrameGenerator.m

But the erorr is : Output argument "src" (and maybe others) not assigned during call to "getSource"

error in waveform(line17)

src = getSource (modulationTypes(modType),sps,2*spf)

I didn't get this error.

Answer 1

[Matt J]

In getSource.m, your switch block is missing an 'otherwise' clause,

switch modType
  case {"BPSK","GFSK","CPFSK"}
    M = 2;
    src = @()randi([0 M-1],spf/sps,1);
  case {"QPSK","PAM4"}
    M = 4;
    src = @()randi([0 M-1],spf/sps,1);
  case "8PSK"
    M = 8;
    src = @()randi([0 M-1],spf/sps,1);
  case "16QAM"
    M = 16;
    src = @()randi([0 M-1],spf/sps,1);
  case "64QAM"
    M = 64;
    src = @()randi([0 M-1],spf/sps,1);
    
    otherwise   %<--- added
        
        error("Unrecognized modType: "+modType);
    
end

[Fatma Nur Disci]

Thanks , it worked :)

[Matt J]

You're welcome, but please Accept-click the answer to close the question.

[Fatma Nur Disci]

Sorry for the late reply Matt. Actually I need your help again. I want to generate pulse modulation signals. So first I need to generate modulating signal then multiply carrier pulse train. If you interested in modulation types could you help me to generate some frames ? Bcs I really don't understand how to generate frames using that example I asked you before.

Thanks.