Technical Presentation on WI-VI

NATIONALINSTITUTEOFSCIENCEANDTECHNOLOGY
MCA TECHNICAL PRESENTATION 2017
NAME- SAMBIT KU. MISHRA PAGE-01
Under the guidance of
Mr. Agyan Kumar Prusty
Submitted by
Sambit Kumar Mishra
Roll no.-201568030
Seminar Id-2999

Outline:-
Introduction
Working
Challenges
Method used to overcome the challenges
Advantages
Disadvantages
Conclusion
Reference
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Introduction
The history of WI-VI lies in the campus of MIT.
It was developed by Professor Dina Katabi and her graduate
student Fadel Atib.
Wi-Vi stands for wireless vision.
It captures moving objects behind the wall.
Device uses typically Wi-Fi hardware devices.
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Working
Wi-Vi is essentially a 3 antenna MIMO device: two of the
antenna are used for transmitting and one is used for receiving.
Wi-Vi relies on simple 2.4 GHz Wi-Fi hardware radio.
Simply this can be decoded on handheld device.
Transmitting signals are low power Wi-Fi signals
The two antennas transmit almost identical signals, except
the second antenna’s signal is inverse of the first, resulting in
interference.
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NAME- SAMBIT KU. MISHRA PAGE-05Roll no.-201568030

Application
Polish avoids ambush.
Firefighters check for human.
Personal security
Gesture interface from behind a wall.
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Challenges
The major challenges faced are
1.Flash effect
2.Tracking of human movement
Due to the obstructions and intermediate object it is essential to
generate more sharper output rays.
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Flash Effect:
When you take a device point it at a wall and transmit Wi-Fi signals, a huge
amount of reflection is going to come the wall itself.
Tracking human movement:
When we get reflections from behind the wall, we get reflections from
everything in the environment: the chairs, tables etc. How can we tease out
the person’s reflections from all these reflections? And once we do that, how
can we track a person based on these reflections.
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Method used to overcome the challenges
Transmit two waves that cancel each other when they reflect off
the static object but not the moving object.
Wall is Static Disappears
People tend Detectable
to move
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Transmit
antenna
Receive antenna
x
αx
Eliminating the wall’s Reflection
x
αx
α= -h1/h2
static objects(wall,
furniture, etc) have
constant channels.
Y=h1x+h2(-h1/h2)x=0
people move, therefore their
channel change.
Y=h1’x+h2’(-h1/h2)x ≠ 0
Y=h1x+h2αx
h1
h2
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Tracking Reflection
Reflection from human behaves like it is the
source.
Antenna used to trace a radio frequency
source.
We can find the direction of the signal
movement by steering the beam of antennas.
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Advantages
Wi-Vi can perform through wall imaging without access to any device on
other side of wall.
Wi-Vi employs signals whose wavelengths are 12.5 cm.
Extend human vision beyond the visible electromagnetic range, allowing us
to detect
objects in the dark or in smoke.
Wi-Vi requires only few MHz of bandwidth and operates in the same range
as Wi-Fi.
It operates in ISM band.
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Limitations
Display has very low resolution.
We can’t detect humans behind concrete walls thicker than 8”.
To achieve a narrow beam the human needs to move by about 4
wavelengths(i.e., about 50 cm).
Short range of communication is possible.
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Conclusion
Wi-Vi or wireless vision technology is the simplest evolution for
communication.
Rather than RADARS and old measures, it can be afforded simply and cheaply.
Its operation in Ism band makes it easily accessible to public without any
specially built transmitting devices.
Hence in most ways, it makes a sense that Wi-Vi technology is one further step
in the fields of electronics and has the most scope of improvements and
applications an far considered.
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Reference
1.www.seminarsonly.com
www.seminarsonly.com&source=lnms&sa=X&ved=0ahUKEwiAj6qe59HSAhXBjJQKHabzAJ8Q_AUIBS
gA&biw=1366&bih=657&dpr=1
2. www.gizmag.com
www.techhive.comhttps://www.google.co.in/search?
q=www.seminarsonly.com&source=lnms&sa=X&ved=0ahUKEwiAj6qe59HSAhXBjJQKHabzAJ8Q_AUI
BSgA&biw=1366&bih=657&dpr=1#q=www.gizmag.com&*
3.www.electronicstoday.com
https://www.google.co.in/search?
q=www.seminarsonly.com&source=lnms&sa=X&ved=0ahUKEwiAj6qe59HSAhXBjJQKHabzAJ8Q_AUI
BSgA&biw=1366&bih=657&dpr=1#q=www.electronicstoday.com&*
4.Seeing through walls - MIT’s Lincoln Laboratory.
http://www.youtube.com/watch?v=H5xmo7iJ7KA
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THANK YOU
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