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Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

4
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Well, the clue is in the last sentence. The receiver has to reliably detect the number of received signals (e.g. 1's in the code sequence), since they add up on the receiver end. If there are two han …
answered Jan 9 by JvO
2
votes
In theory yes, if your antenna is big enough. In practice there are limits. Consider the Voyager spacecraft. It's currenctly some 20 billion km (2.0 x 10^10 km) away from earth and has a 20 Watt radio …
answered Mar 20 '16 by JvO