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question about white gaussian noise

Started by bamse May 10, 2004
does additive white gaussian noise only change the amplitude of a signal or
does it change both amplitude and phase?


"bamse" <bamse@kyllingen.dkkkk> wrote in message news:<6BEnc.4$NS3.3@news.get2net.dk>...
> 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. Rune