This Technolgy can scan the objects that are behind the wall. This can detect humans as wellas other obejcts which can't beseen through eyes.

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)

5. Basic Idea
Wi-Vi
Transmitted
Singals
reflected signals
Moving object
wall

6. Challenges Faced in Wivi
1. Flash Effect

7. 2. Identifying and tracking Humans

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.

10. Implementation
Universal Software Radio Peripheral(USRP N210)
 Connects through Usb or Ethernet links
 Products are open source
 Cost

11. Implementation
 SBX transceiver
 MIMO nulling
 USRP
 Capable of MIMO and provides upto 40 MHz
bandwidth
SBX transceiver

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.

14. Applications
 Emergency Situtions
 Rescue Operations
 Law Enforcement

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.

16. Thank You