# Re: Variance of Gaussian Noise

On Mar 25, 7:08 pm, Sebastian Doht <seb_d...@xxxxxxxxx> wrote:
sasuke schrieb:

On Mar 26, 7:54 am, "sasuke" <a.ssjg...@xxxxxxxxx> wrote:
Does Gaussian Noise have the highest variance among all possible noise
distributions? Is there a way to prove it??
Isn't that a bit like asking - Does a 24kHz sine wave have the largest
amplitude of all frequencies?

Sorry. I messed up the question completely. Please disregard.
The question which I actually wanted to ask was, is it true that Gaussian
noise is the worse kind of noise to affect a communication channel? In
other words is the capacity of a communication channel least when the
channel is corrupted by an additive Gaussian noise??

Actually gaussian additive noise is the ideal kind not the worst kind.
Because gaussian distributions are simple to be analysed many filters
are optimised for that kind of noise.
The capacity of the channel will decrease in any case of noise, so your
question still sounds confused...

I'll try to interpret your question as given a fixed amount of average
power, which amplitude distribution is most effective at jamming.

In that case Gaussian noise would not be the answer...

I think the answer would be an impulsive noise signal whose BW was
confined to your channel of interest and that is either off or on and
when on it is at max power and the duration and repetition rate of the
on time is such so as to do the most damage based on the FEC the
system is using. So the answer depends on the type of FEC. But
Gaussian noise while it has infinte peaks (in theory) does not make
the "best use" of the average power.

Mark
.

## Relevant Pages

• Re: frequency band
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