Wi-Vi Technology
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Transcript of Wi-Vi Technology
Wi-Vi Technology
1
: Wi-Fi that see through walls
Presented by –Aman RajIndian Institute of Technology(ISM), Dhanbad
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ContentsIntroductionWhat can Wi-Vi do ?ApplicationDesign MethodologyResultsAdvantagesLimitationsFuture ScopeConclusion Bibliography 2
https://lh3.ggpht.com/UNrV_pPYCkgN3QK4T6Zotm3pevg3RcBuHH4DQV7e-wKoAYmHKMDGsW
Introduction
Wi-Vi stands for Wireless Vision.Demonstrated by “Dina Katabi”, a MIT’s professor of
Electrical Department.Wi-Vi uses OFDM signals in ISM Band(at 2.4 GHz) and
typical WiFi hardware.Wi-Vi captures moving Objects behind the walls.
What can Wi-Vi do?Detect the Number of Moving Humans in a
Closed Room.Determine the Relative Location of Moving
Humans.Enable Communication through a wall, without
carrying a Wireless Device.Can Identify simple Gestures Behind a wall.
ContinuedWi-Vi device transmits two waves that cancel each other when they reflect from a static object but not the moving object.
Wall is Static Disappears
People tend to move Detectable
Applications
Gesture control behind the wall
Police avoids ambush
Firefighters check for humans
Personel Security
https://url?sa=i&rct=j&q=&esrc=s&s
Design MethodologyWi-Vi device consists of 3 parts; Wi-Fi signal, Transmitter and
Receiver.
Wi-Fi
Transmitter ReceiverWi-Vi
https://www.google.co.in/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=
Description of Wi-Vi: Wi-Fi device, Transmitter and Receiver
Wi-Fi Device
Receiver
Transmitter
https://www.google.co.in/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8
Wi-Vi Setup
Wi-Vi uses angle of arrival of signals to detect movement and no. of humans behind the wall.
https://www.google.co.in/imgres?imgurl=http%3A%2F%2Fwww.patrol-log.com%2Fwp-content%2Fuploads%2F2013%
Results
oA prototype of Wi-Vi setup used by Dina Katabi gave the following results:
Wi-Vi can detect objects and humans moving behind opaque structural obstructions.
This applies to 8” Concrete Walls, 6” Hollow walls and 1.75” solid wooden doors.
Continued:Wi-Vi depends upon the amount of movement.To achieve a narrow beam, the human needs to move by
about 50cm.
Detected/Actual 0 1 2 3
0 100% 0% 0% 0%
1 0% 100% 0% 0%
2 0% 0% 85% 15%
3 0% 0% 15% 90%
Table. Accuracy of Automatic Detection of Humans.
Detection Accuracy of Wi-Vi for Different types of obstructions:
Free Space Tinted Glass 1.75" solid wall 6" hollow wall 8" Concrete80
85
90
95
100
105
Series 1
Advantages:
1. Wi-Vi requires only few MHz of bandwidth similar as Wi-Fi.
2. Its setup is Low-Cost and Low-Power.3. Wi-Vi can perform through wall imaging without
access to any device on the other side of the wall.4. Works as extra human senses.5. Allows to detect object in Dark or smoke.
Limitations
1.Display has very low Resolution.2.Cannot detect human behind very thick
walls(>8” thickness).3.Human needs to move at least 50 cm to be
detectable.
Future Scope:
Wi-Vi could be built into a Smartphone or a special Handheld Device.
Can be used in Search and Rescue mission by Fire Fighter and Law Enforcement.
ConclusionWi-Vi is a Wireless Technology that uses Wi-Fi signals to detect moving humans behind walls and in a closed rooms. In contrast to previous systems, which are targeted for military, Wi-Vi enables small cheap, see- through wall devices that operates in the ISM band, rendering them feasible tp the general public, without carrying any extra transmitting device.
Bibliography
http://people.csail.mit.edu/fadel/wivi/USRP N210. http://www.ettus.com. Ettus Inc.X-box Kinect. http://www.xbox.com/ Microsoft/wiviRadarVision. http://www.timedomain.com. Time Domain
CorporationHow Signal is affected. www.ci.cumberland.md.us/See Through Walls with Wi-Fi! Fadel Adib and Dina Katabi
Massachusetts Institute of Technology {fadel,dk}@mit.edu
Thank You !