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What is the formula to calculate gaussian noise, given we have variance and mean? I am trying to search google for formula but i am unable to find any much relevant result. If for example i have mean as "11" and variance as "18". Then how i can use these two value for calculating/generating a noise signal from gauss distribution??which formula should i use,where i can put these values of variance and mean,and then i will get noise signal

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In MATLAB, you can do it that way:

>> nsamples = 1e9;
mu = 11;
sigma_squared = 18;
x = mu + sqrt(sigma_squared)*randn(nsamples,1);
mean(x)
ans =

   10.9998
var(x)   
ans =

   17.9994

Edit: link https://www.mathworks.com/help/matlab/math/random-numbers-with-specific-mean-and-variance.html

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  • $\begingroup$ very nice. But from where did you got this formula?Link? x = mu + sqrt(sigma_squared)*randn(nsamples,1); $\endgroup$ – engr Mar 3 '20 at 16:50
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    $\begingroup$ @engr Did you try clicking on and then reading the link? $\endgroup$ – Engineer Mar 3 '20 at 17:47
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tx = Transmission vector

noise=sqrt(sigma2/2)*randn(size(tx));
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  • $\begingroup$ sigma2? what is it? $\endgroup$ – engr Feb 2 '20 at 16:04
  • $\begingroup$ variance of complex noise. $\endgroup$ – jomegaA Feb 2 '20 at 17:28
  • $\begingroup$ can you please share link/refrence of this formula?? $\endgroup$ – engr Feb 9 '20 at 5:51
  • $\begingroup$ no mention/use of mean in this formula? will the factor of mean will be redundant while calculating noise in this case? $\endgroup$ – engr Feb 9 '20 at 5:52
  • $\begingroup$ What is transmission vector?how we can get/find its value? $\endgroup$ – engr Feb 9 '20 at 5:53

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