New system uses low-power Wi-Fi signal to track moving humans(web.mit.edu)
web.mit.edu
New system uses low-power Wi-Fi signal to track moving humans
http://web.mit.edu/newsoffice/2013/new-system-uses-low-power-wi-fi-signal-to-track-moving-humans-0628.html
"So instead Wi-Vi uses just one receiver. As the person moves through the room, his or her distance from the receiver changes, meaning the time it takes for the reflected signal to make its way back to the receiver changes too. The system then uses this information to calculate where the person is at any one time."
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