Hi Al,
The Central Limit Theorem says that it doesn't matter what the
distribution function is for each individual signal. As long as there
are a lot of them, the total has a Gaussian distribution. In fact, it
doesn't take very many to get quite close to Gaussian - something like 4
to 6 is generally sufficient if they are roughly equal in amplitude and
uncorrelated (different frequencies).
Alan N1AL
On 09/16/2015 02:26 PM, Al Lorona wrote:
This is really good information, Alan, and makes sense. Regarding the
approximation to Gaussian noise... given that most signals on a
crowded band during a contest are highly compressed (their
peak-to-average ratios are much smaller) would this make matters
better or worse for the ADC, or no difference? I think I read that
some signals during a contest have PAR's of 1 dB. Al W6LX
As a rule of thumb the peak to RMS voltage ratio of Gaussian noise
is about 5 or 6, or 14-15.6 dB.
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