>> 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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