Adding noise to a channel

I need a code or function to add noise to a channel of band 10kHz to 15kHz as an exmple

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/comm/ref/awgn.html

[Mohamed Ashraf]

Sorry but my question wasn't clear enough I would like to have noise in a channel band whether there is a signal or not