Additive white gaussian noise

Hello

I am using the "awgn" in my function to add noise to a signal. I need to describe and document the exact process of how the noise is added but I could not find any actual formulae on the matlab website that describes the function. I understand the syntax and how to use it but I don't understand how exactly does awgn distribute the noise ? Is it just a random number in a range ? Also what exactly does the snr input argument control ( I do understand that its signal to noise ratio but the noise is meant to be a random number so how does snr affect random number generation within the function ? ), does the PSD of the noise equal snr*signal-in ? Or is it the integral of the PSD ?

Answer 1

[Adam Danz]

Here:

https://www.mathworks.com/help/comm/ug/awgn-channel.html#a1071501088

[nth24601]

Thank you.