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Intermodulation distortion.
intermodulation noise
1. White noise
2. Impulse noise
3. Echoes
4. Intermodulation
My guess is that fdma is the one that suffers most from intermod.
I could be wrong.
G. H. Millard has written:
'Intermodulation between v.h.f./f.m.broadcast transmitters and the protection of adjacent-band aeronautical services'