FreeLists / si-list / [SI-LIST] Sampling White Noise

[Himanshu Arora <ha324005@xxxxxxxxx>]

Hello,

I have interesting question. Will the broadband noise
increase or decrease with sampling?

1. Being broadband, we are obviously going to result
in undersampling, leading to aliasing. Hence, increase
in noise floor w.r.t. when aliasing was not present.

2. Scaling ( reduction) of broadband noise source,
with tau/T where tau is the on time and tau/T is the
duty cycle. So this shows there is a reduction in
broadband noise due to presence of sin(x)/x terms...
(the discrete spectra of the periodic square wave).

I think the net noise spectra should reduce because,
the noise source is on only for a finite duration of
time, tau in a time period T ( as compared to when it
was infinitely on). 

But I still need by how much amount will the noise
scale down overall ( in presence aliasing which is
causing increase in noise and sinc term causing
reduction in noise )?

Sincerely

Himanshu Arora
PhD Student,
Duke University.

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