'helperMod​ClassGetNN​Frames' is used in Modulation Classification with Deep Learning. Error in Project_1 (line 41) unknownFrames = helperModC​lassGetNNF​rames(rx);

Rician= (GI+1j*GQ);

signal= Rician.*tx';

snr=30;

A= (10^(-snr/20));

ric= Rician;

% noise

output=A*ric;

rx=signal+output;

unknownFrames = helperModClassGetNNFrames(rx);

% Classification

[prediction1,score1] = classify(trainedNet,unknownFrames);

plot(prediction1);

[Kunal Pathak]

Getting an error

'helperModClassGetNNFrames' is used in Modulation Classification with Deep Learning.

Error in Project_1 (line 41)

unknownFrames = helperModClassGetNNFrames(rx);

Answer 1

[Aditya]

Hey Kunal,

The code snippet you provided seems to be missing the definition or initialization of several variables (`GI`, `GQ`, `tx`, `trainedNet`). To debug the code, you need to ensure that these variables are properly defined or initialized before executing the code. Here's a modified version of the code with placeholders for the missing variables:

GI = ...; % Define or initialize GI 

GQ = ...; % Define or initialize GQ 

tx = ...; % Define or initialize tx 

trainedNet = ...; % Define or initialize trainedNet 

 

Rician = (GI + 1j * GQ); 

signal = Rician .* tx'; 

snr = 30; 

A = 10^(-snr/20); 

ric = Rician; 

 

% Generate noise 

output = A * ric; 

rx = signal + output; 

 

unknownFrames = helperModClassGetNNFrames(rx); 

 

% Classification 

[prediction1, score1] = classify(trainedNet, unknownFrames); 

 

plot(prediction1); 

Make sure to replace the `...` placeholders with the appropriate definitions or initializations for the missing variables (`GI`, `GQ`, `tx`, `trainedNet`). Additionally, ensure that the `helperModClassGetNNFrames` function is defined and accessible in your code.

By providing the missing variable definitions and ensuring the availability of the necessary functions, you should be able to debug and execute the code successfully.

hope this helps!

Answer 2

[Steven Lord]

This function is a helper function used and defined by the example. It is not a general toolbox function that is on the MATLAB search path by default. If you open the example in MATLAB or MATLAB Online, MATLAB will change the current directory to the example's folder which contains the helpers that example uses (including helperModClassGetNNFrames.m) and you would be able to use it to run the example.