How to do Gaussian walk perturbation?

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Saed
Saed am 15 Nov. 2012
Hello,
In a paper it is said the following:
"The channel is simulated ... with L=10. The channel coefficients are obtained by independently generating each of the taps according to an exponential power delay profile ... . Time variations are then obtained by perturbing the resulting coefficients by means of a zero-mean Gaussian random walk with tunable variance."
How to do the bold part in MATLAB?
I generated the channel coefficients as:
if true
h=(1/sqrt(2*(L+1))).*(randn(L+1,1)+1i.*randn(L+1,1));
end
Now I need to add time variability by means of zero-mean Gaussian random walk. How?
Thanks

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