MIT professor Dina Katabi and graduate student Fadel Adib have announced WiVi, a demonstration of a technology that usesto 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 awas 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 "."]
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.
WiVi could also serve as a high tech baby monitor or help Superman or just cops catch baddies.
This story was provided by , a sister site to LiveScience.
Copyright 2013 , a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.http://blog.yahoo.com/_EDFDDQU32SWAZZYRGOWQGUBDNY/articles/1275017
http://toneybyr.edublogs.org/2013/06/27/a-wife-for-papa-zebra-regency-romance-download/
http://friendfeed.com/lbqnn/c4f5be66/download-national-geographic-field-guide-to
http://friendfeed.com/oldsibr/c1287095/story-of-miss-saigon-e-book-downloads
http://ijjuvej.blog.com/2013/06/27/dream-horse-online/
http://nicholeqnb.blog.free.fr/index.php?post/2013/06/27/Moments-of-Despair%3A-Suicide%2C-Divorce%2C-and-Debt-in-Civil-War-Era-North-Carolina-book-downloads
http://friendfeed.com/zqynb/12bbda9c/l-as-tu-lu-mon-p-tit-loup-le-guide-usage-des-parents
http://blog.yahoo.com/_U4DYO242J4XDG3IITLNA52WSKQ/articles/1281606
http://elinorgedi.edublogs.org/2013/06/27/downloads-2012-tracks-of-nascar-wall-calendar/
http://uyciwulu.deviantart.com/journal/North-America-Primary-Wall-Map-Railed-Primary-Cl-380970966
http://aroytlun.blogdetik.com/2013/06/25/downloads-programming-microsoft-sql-server-2005-e-book/
http://reuromuh.jimdo.com/2013/06/26/download-when-we-were-real-book/
http://owvelugu.blog.com/2013/06/27/flash-and-ambient-lighting-for-digital-wedding-photography-creating-memorable-images-in-challenging-environments/
http://cuukufur.livejournal.com/815.html
http://giudoye.jimdo.com/2013/06/26/download-swann-19th-and-20th-century-prints-and-drawings-auction-catalog-sale-2106-march-6-2007-e-book/
http://friendfeed.com/yrqad/021ededd/downloads-soccer-duel-e-book
http://blogs.rediff.com/hallieekbq/2013/06/27/dance-of-the-moon-celebrating-the-sacred-cycles-of-the-earth-e-book-downloads/