Wearables of the future may use reflected WiFi signals to communicate - Engadget
 

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Wearables of the future may use reflected WiFi signals to communicate
Engadget
That problem wasn't lost on a team of researchers from UCLA and the Jet Propulsion Laboratory -- they've spent the last two years cooking up a way for a device to communicate with a WiFi router by reflecting the very signals it sends out back at it ...
Ultra low power Wi-Fi using backscatter technologyFerret

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