does WGN(white Gaussian noise) imple zero mean?

From: kiki (lunaliu3_at_yahoo.com)
Date: 12/26/04 

Date: Sat, 25 Dec 2004 19:40:23 -0800

Hi all,

I read through several books but did not get clarification on whether
WGN(white Gaussian noise process) imply zero mean or not...

Another confusion I have is that the definition of WGN is it has flat power
spectrum density, let's say S(f)=1, then Rx(t)=delta(t) is its
autocorrelation function, I don't see how people say the power of this noise
process is E((x(t))^2)=sigma_x, something like that... the power should be
infinite, right?

Any clarifications? Thanks a lot!

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