MATLAB: How to generate additive white guassian noise

noise

I have a sine wave,I want to generate additive white guassian noise with zero mean and unit variance and want to add,kindly help,which command to use and i want to plot these two signals

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See randn() and plot().

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MATLAB: How to generate gaussian white noise with variable variance

It is not clear what do you mean by variable variance. If you want a bunch of random numbers all with the same variance, but you want to be able to specify the variance sigma2:

randn(1, 0, sigma2);

If you want a set of random variable, with each coming from a distribution with a different sgima

sigma.*randn(size(sigma));

MATLAB: Adding gaussian white noise to data

doc randn

or online

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

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MATLAB: How to generate gaussian white noise with variable variance

MATLAB: Adding gaussian white noise to data

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