Want Xray vision like the man of steel? A technology that lets you see behind walls could soon be built in to your cell phone. 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.") Previous work demonstrated that the subtle reflections of wireless inter signals bouncing off a human could be used to track that person's movements, but those previous experiments either required that a wireless router was already in the room of the person being tracked, or "a whole truck just to carry the radio," said Katabi. The new device uses the same wireless antenna as is found in a cell phone or laptop and could in theory one day be embedded in a phone. [See also " WiSee Detects Your Gestures Using WiFi ."] The trick is canceling out all interfering signals – Wi-Fi doesn...
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