download wi vi technology seminars report pdf
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download wi vi technology seminar report pdf

ABSTRACT

Wi-Fi signals are typically information carriers between a transmitter and receiver. Through this paper we are trying to extend our senses so as to see moving object through the walls and closed doors, under this technology communication is possible by combination of gestures and by messaging without even using the any transmitter. In this paper to innovations are being introduced: (1) Use of MIMO interfacing to nullify the effect of static object and focusing the receiver on a moving target (2) motion of a human body is treated as an antenna and resulting RF beam is tracked. Not much research has been done on this technology but Wi-Vi could be built into a smart phone or a special handheld device and used in search-and-rescue missions and law enforcement. To exemplify, someone walking outdoors at night who thought they were being followed might use it to detect a person behind a fence or around a corner. The key benefits of Wi-Vi over current ways of seeing through walls, such as radar and sonar, are cost, power and size. At the heart of the technology is its encoding scheme, which can be implemented in silicon. WiVi could be built into a cell phone soon, and for not much more than the cost of a regular Wi-Fi module. Bringing wall-penetrating vision to handheld devices could open up a lot more uses for it. Current radar-based systems used in the U.S. military are so big they need to be transported on trucks. Even the Army might need a more portable tool for seeing through walls in certain settings. Because of its low resolution, Wi-Vi could actually enhance people's privacy rather than erode it in some cases.

Introduction

Researchers at MIT's Computer Science and Artificial Intelligence Laboratory have developed what could become low-cost, X-ray vision. The system, known as "Wi-Vi," is based on a concept similar to radar and sonar imaging, but rather than using high-power signals, this tech uses reflected Wi-Fi signals to track the movement of people behind walls and closed doors.When a Wi-Fi signal is transmitted at a wall, a portion of that signal penetrates through and reflects off any humans that happen to be moving around in the other room. Since only a tiny fraction of the signal passes through the wall, with the rest being reflected, the researchers had to devise a technology that could could cancel out the arbitrary reflections, and keep only those reflecting from moving human bodies.
Dina Katabi, a professor in MIT’s Department of Electrical Engineering and Computer Science, and her graduate student Fadel Adib have tuned a system that uses two transmission antennas and a single receiver. The two antennas transmit almost identical signals, except the second antenna's signal is the inverse of the first, resulting in interference.This interference causes the signals to cancel each other out. Since any static objects that the signals hit create identical reflections, they are also cancelled out by this effect. Only the reflections that change between the two signals, like moving bodies on the other side of the wall, arrive back at the receiver, allowing the system to track the moving people.Adib says, "So, if the person moves behind the wall, all reflections from static objects are cancelled out, and the only thing registered by the device is the moving human."Previous attempts to see through walls in this manner have done so using an array of spaced antennas, which capture the signal reflected off of moving people in the room. Such systems, though effective, would be too cumbersome and expensive for use in a handheld device. By using just one receiver, the new system effectively measures the time it takes for signals to reflect, leading to a calculation of location.Relying on low-cost Wi-Fi technology, the Wi-Vi system could be utilized in everything from disaster recovery to gaming. Because the device can detect action behind a wall, the system could be used as a gesture-based interface for controlling appliances or lighting.Venkat Padmanabhan, a principal researcher at Microsoft Research, says the possibility of using Wi-Vi as a gesture-based interface that does not require a line of sight between the user and the device itself is perhaps its most interesting application of all.

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please download link of wivi  report pdf provide ,so we can download easley .it is best site for download any site data so please provide link .i need this report.
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