additive white gaussian in matlab

hi,all how i can add to my signal see x additive white gaussian noise with flat power spectral density in matlab

thanks in advance

Answer 1

[Shashank Prasanna]

There are a lot of functions you can use to do that, depends on what toolbox you have and how you want to specify the nature of the noise:

http://www.mathworks.com/help/matlab/ref/randn.html

http://www.mathworks.com/help/comm/ref/awgn.html

http://www.mathworks.com/help/comm/ref/wgn.html

[anas qazaz]

thanks for answering but i want add white gaussian noise with "flat power spectral density"

[Shashank Prasanna]

White noise already means that: http://en.wikipedia.org/wiki/White_noise

awgn and wgn will do this for you