USING YOUR CELL PHONE TO SEE THROUGH WALLS
New WiVi app built-in to your cell phone would let you see behind walls - this is truly the end of privacy
MIT professor Dina Katabi and graduate student Fadel Adib have announced WiVi, a demonstration of a technology that uses WiFi to allow a viewer to "see" a person moving behind a wall. (WiVi stands for "WiFi" and "vision.")
The trick is canceling out all interfering signals – Wi-Fi doesn't just bounce off humans, but also walls, floors, and furniture. And those signals are 10,000 to 100,000 times more powerful than the reflections off a human body.
Katabi's wivi sends out two wireless signals, one of which is the inverse of the other. In what Katabi calls "interference nulling," the two signals cancel each other out unless they hit a moving target – such as a human. "To silence the noise, we change the structure of the Wi-Fi signal so all the undesired reflections cancel," she said.
The device is meant to be portable so, for example, a person worried that someone was hiding in the bushes could do a quick scan for her personal safety.
More on WiVi - http://www.pcmag.com/article2/0,2817,2421218,00.asp
Related:
Wi-See detects your gestures using WiFi - http://www.technewsdaily.com/18262-gesture-detection-system-uses-wifi.html
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