OFDMA (not OFDM) is used as an access mode in LTE in combination with
TDM. I'm toying with the idea for a while now, but with 5-6 hours a
week available I haven't made much progress lately. Regarding 4FSK,
personally I see no advantage over 2FSK. It's certainly more
complicated to get working.
OK Cool - OFDMA is new to me - I'll read up on it.
There are carefully tested Octave and C 4FSK modems that meet
theoretical performance in codec2-dev that you can use as a reference.
With open source, implementation complexity isn't a huge issue - someone
only has to build it once. mFSK isn't that much harder than 2FSK, and
certainly easier than a PSK modem.
4FSK is about 3dB better than 2FSK with no increase in bandwidth. So
you get the same performance as 2FSK for half the tx power. Pretty cool.
Cheers,
David
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