[time-nuts] Sinlge ADC multi-band receiver
attila at kinali.ch
Sun Apr 9 16:29:00 EDT 2017
On Wed, 5 Apr 2017 10:37:07 +0200
Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> Also, you don't really need to keep the bands fully separate in their
> mixed-down form, since they do not correlate except for the P(Y), but
> keeping enough frequency difference, such that doppler shift does not
> remove correlation margin, they remain uncorrelated. Some of the
> literature pay much attention to the band not wrapping around the
> band-edge, but I'm not convinced it is such a big issue.
If part of the signal wraps because you are at the bandedge,
then you lose this part of the signal and the part it wraps over.
This is due to the signal coherently overlapping in frequency space.
As far as I understood the math, there isn't a way to seperate them
again (at least there isn't any I am aware of). Thus this signal energy
is lost for the decoding process.
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