Wi-Vi signals are used to see-through-wall

Researchers at MIT's Computer Science and Artificial Intelligence Laboratory have come up with a way to create a low-power, portable device that can see through walls using Wi-Fi signals. Technology of this sort, similar in concept to radar or sonar, has existed for years and relies on radio waves and other parts of the electromagnetic spectrum. It is used mainly in law enforcement and military applications. Dina Katabi, a professor in MIT's Department of Electrical Engineering and Computer Science, and graduate student Fadel Adib propose wider civilian use of the technology through a simple, affordable device like a mobile phone, equipped with two antennas and a receiver.  Here's an interesting video that shows how the system works. Katabi suggested the technology, which she calls WiVi, can be used for virtual reality and gaming, without requiring the user to remain in a specific area in front of a sensor. She also says the technology could be used for personal safety. <more>