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Sorry, yes. But here we don't have a spectrum, we just have a single value. An infinitely variable value, but just a single value. So the jamming resistance of CDMA doesn't seem to apply; the jammer effectively blocks the whole range in one go with a single transmission.
Sure you have a spectrum. The voltage between ends of an antenna is a scalar, and it _does_ pick up all frequencies, although some more strongly than others; it's up to the rest of the circuitry to filter down to the one you care about. I think CDMA is a great idea here.
i guess everyone who is trying to send is collectively modulating the variable rather than spamming it to a particular absolute value?
Yeah, like radio (that was my thought, anyway)
Then I'm clearly misunderstanding what you meant by "single value". An attacker doesn't need to block values in the spectrum between 50->100 or 100->200 or... they just need to keep asserting 42, and if they do it quicker than you can sample and read then you'll only get 42.
Yeah, apologies - that was maybe unclear. If you think about something like the electromagnetic field (which is a vector field), you can measure its value at any time at a given point in space. By measuring rapidly (at some frequency S) you are able to observe multiple signals...
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