1. PRESENTATION ON
“WIVI TECHNOLOGY”
By
Shaikh Uzear Abdulhak
Under the Guidance of
Prof. V.K.Agham
Department of Computer Engineering
SES’s R. C. Patel Institute of Technology, Shirpur
Maharashtra State, India
2017-18
2. Contents
History
Introduction
Basic Idea
Challenges faced in designing Wi-Vi
Flash Effect
Tracking Human Movement
Methods use to Overcome the challenges
Implementation
Advantage and Limitation
Applications
3. History
This Research is invented at MIT's Computer Science
and Artificial Intelligence Laboratory
Dina Katabi , a professor in MIT’s Department of
Electrical Engineering and Computer Science, and her
graduate student Fadel Adib invented this technology.
4. Introduction to Wi-Vi
Wi-Vi stands for WiFi Vision
Capture moving objects behind the walls
Use WiFi singals in ISM bands(2.4 GHz)
Requires a WiFi Hardware
3 Antenna MIMO device(Two transmitter antenna and
one receiver antenna)
8. How Can We Eliminate the Wall’s Reflection ?
MIMO NULLING CONCEPT
MIMO systems can pre-code their transmissions such that the signal
received at a particular antenna is cancelled.
This property can be tailored to eliminate the flash effect as well as the
direct signalfrom the transmitting to the receiving antenna, thereby
enabling Wi-Vi to capture the reflections from objects of interest with
minimalinterference.
At a high level, Wi-Vi’s nulling procedure can be divided into threephases:
Initial nulling
Power boosting
Iterative nulling
9. How Can We track the movement of Humans ?
ISAR – Inverse Synthetic Aperture Radar:-
Inverse synthetic aperture radar uses the movement of
the target to emulate an antenna array.
In ISAR, there is only one receive antenna; hence, at any
point in time, we capture a single measurement. since
the target is moving, consecutive measurements in time
emulate an inverse antenna array – i.e., it is as if the
moving human is imaging the Wi-Vi device.
12. Advantages
Wi-Vi is relatively a low power,low-cost,low-
bandwidth , and low size.
Wi-Vi requires only few MHz of bandwidth and
operates in the same range as Wi-Fi. It operates in ISM
band.
It allowing us to detect objects in the dark or in smoke.
Accurate detection and good accuracy.
13. Limitations
We cannot detect the human if concrete walls thicker
then 8“.
It has low resolution.
15. Future Scope
Wi-Vi could be built into a smartphones or a special
handheld device.
Evolution of seeing humans through denser building
material and with a longer range.