Could tracking the phase of signals over time be done to separate pieces of
signal from different transmitters?  (Or maybe you already do this.).   A
signal from one source will be phase coherent with itself over time while
other signals will be at some random relationship in phase at least for the
duration of one tone.

If the transmission algorithm could be made to preserve coherence over an
entire exchange, so that any given tone will be coherent with all other
occurrences of that tone, that could provide more information the receiver
could use to tease apart overlapping signals.

Paul, KB1EHD
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