How do I create a random variable which is exponential with a mean of 2

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Will 2011-11-14

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采纳的回答： bym

Hey, I need to create a signal, X, which is exponential with a mean of 2. It is transmitted through an additive Gaussian noise channel where the Gaussian noise has a mean of -1 and a variance of 4. The signal and noise are independent.

I realize I have to use randn() for the random variable but am not really sure how to get a specific mean or how to produce the Gaussian. Have been away from MatLab for awhile. Any help would be greatly appreciated. Thanks! -Will

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bym 2011-11-15

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在 MATLAB Online 中打开

if you have the statistics toolbox:

exprnd()

to roll your own

x = -2*log(rand)

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Will 2011-11-15

thanks

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Will 2011-11-15

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Thanks didn't even realize I had the stats toolbox. Any ideas on how to produce the additive Gaussian noise channel?

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bym 2011-11-15

whoops should be

agwn = 2*randn(size(A))-1 %multiply by standard deviation *not* variance, sorry

Will 2011-11-15

Appreciate it

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