Marcus D. Leech wrote:
I'm toying with some insane ideas for EME (Moonbounce) for a friend of mine.
I'm toying with taking a modulated baseband from a QAM16 modulator, and
replicating it across several spectral pickets
over a wide band, then on reception doing "something" with these
redundant copies to improve SNR/BER.
I'm currently thinking Analysis Filterbank/Synthesis Filterbank to take
the baseband signals, and spread them across
a wider spectrum, with replication.
Ignoring whether this approach is sane or not is the filterbank the
right block to use to take multiple narrow baseband signals and
"map" them onto a wider baseband?
The filterbank is the way to do what you are asking. But the overall
idea is not sane :) QAM-16 makes no sense on such a weak signal. The
purpose of QAM16 is to get more bits per second per hertz. What you
want is more bits per second per watt. In any case, if you just do
OFDM, then you don't need to worry about filterbanks.
I would suggest looking up and reading the paper that Phil Karn (KA9Q)
wrote a long time ago, called EME-2000.
Matt
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