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How to model a noise floor with matlab?

Started by seba...@arcor.de April 11, 2006
I want to model a noise source with matlab. the spectrum should have an offset of 5 uV and a white distribution.

I tried so:

mean=0;
stddev=0.3;
white = random('norm', mean, stddev, 1, 4096); % units [volts]

and the spectrum:

WNt(white)/4096;

how can I add the 5uV offset to the spectrum in the time domain?