>> On the other hand, I wonder how much noise the signal has to be
>> detected over?
>
> 10^26 Watts of star
At which wavelengths?
I saw designs for digital filter that's supposed to recover a 2 mV
signal burried in a 250 V carrier. (And this was an introductory DSP
book.) This works because the two signals are at completely different
frequencies.
If you look at the emission spectrum of the star and pick a wavelength
where there's little or no emission, it could hypothetically work I guess...
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