awgn is missing?
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Hi, awgn() is part of the Communications System Toolbox.
Do you have that product installed?
and see if it is the list of your products.
Alternatively, you can use randn() to add WGN to your signal or image, but awgn() comes with more options.
I think it would be nice to have since that is your area.
You can get the Communications System Toolbox as an add-on for you student version: