How to add AWGN noise using randn function?

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Afaq Ahmad el 13 de En. de 2021

I have a discrete time signal which I generated as follows:

I wish to add AWGN noise using randn() function with mean=0 and variance=0, 0.1, 0.5, 1, 1.5 and 3.

The code i have written is:

How can I modify my function to add the noise and later on, demodulate it back into a matrix (as shown in 'w' array)?

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R2014a

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