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July 1 2013

Wi-Fi Tech Sees Through Walls


There are fancy terahertz cameras to see through walls, and X-ray scanners that can fit in the palm of your hand. Now scientists at MIT have built a way to track people with Wi-Fi signals.

The idea is pretty simple: take two transmitters and one receiver. Each transmitter sends out a signal that is precisely 180 degrees out of phase with the other, so the two cancel each other out and the receiving antenna “hears” nothing.

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