How to add a Gaussian Noise to a signal so that the noise level on the signal equal a 20%

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boureghda mohammed 2017-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/350259-how-to-add-a-gaussian-noise-to-a-signal-so-that-the-noise-level-on-the-signal-equal-a-20

My signal is a train of rectangular pulses with a temporal resolution of 0.1 s. I want to add a zero mean Gaussian noise so that the noise level on the signal equal 20%. How can I choose the variance of the Gaussian noise so that I achieve this percent? I used the following MATLAB code to generate the signal:

Signal = gensig('square',20,100,0.1);