does additive white gaussian noise only change the amplitude of a signal or
does it change both amplitude and phase?
Reply by Rune Allnor●May 10, 20042004-05-10
"bamse" <email@example.com> wrote in message news:<6BEnc.4$NS3.firstname.lastname@example.org>...
> does additive white gaussian noise only change the amplitude of a signal or
> does it change both amplitude and phase?
There are two ways of looking at Gaussian noise:
Time domain: Random numbers are drawn from a Gaussian distribution
and added to the samples in the signal, thus "changing the amplitude"
of the individual samples.
Frequency domain: A signal with specified frequency magnitude, given
by the noise autocorrelation function, and random phase response is
added to the signal spectrum, thus "changing the phase" of the spectrum.