Can this be done for WiFi? Ok, full disclosure… I don’t know what I’m talking about. Reading this is the sum of my research on this topic.
Ok, so, modulating the polarization of an EM wave can now be added to the list of modulation methods, which includes FM and AM, eh? …Turns out that there is already third method that I didn’t know about… PM (phase modulation). I don’t know if things like QAM count as additional modulation methods or not. Maybe those are just permutations of the existing methods?
Just thinking out loud here. :)
Second question.. Have the SETI folks considered this?