G NARAYANAMMA INSTITUTE OF TECHNOLOGY & SCIENCE
LIFI THE LATEST TECHNOLOGY IN WIRELESS COMMUNICATION. SUBMITTED BY: K.SHRADDHA B.TECH 2
ND
NEELIMA
YR
B.TECH 2
[email protected]
ND
YR
[email protected]..
[email protected]
ABSTRACT In this era of advanced science, a number of wireless connections connections are available to connect to the internet. It has become a very common and a handy tool to access wireless internet from a coffee shop to a conference hall. As the number of people accessing accessing the wireless wireless internet internet increase, the the clogged airwaves make make it extremely difficult to latch on to a reliable signal. One German physicist Harald Hass has come up with a solution which he names as “data through illumination” taking the fiber out of fiber optics by sending data through LED light bulb that varies in intensity faster than a human eye can. INTRODUCTION:
Identify. This technology is named as LiFi transmission which stands for light fidelity. This invention can produce data rates faster than 10 megabits per second which is much more than that of an average broadband connection speed.
Li-Fi is a label for wireless-communication wireless-communication systems using light as a carrier instead of traditional radio frequencies, as in Wi-Fi..Li-Fi should not be confused with the more general term visible light communications (VLC), which is the use of the visible light portion of the t he electromagnetic electromagnetic spectrum to transmit information.
Lifi is Transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye as f ollows:
other places without causing interference. interference. This is a free band that does not need any license. Hence it is cheaper than Wi-Fi. The visible light spectrum is larger than the radio spectrum which provides better flexibility in its use. use. Since optical optical waves do not pass through walls this could be used as a means of secured communication. Communications Communications over a very high speed with a theoretical limit of 1 GB a second. The technology is capable of transferring thousands of streams of data simultaneously, in parallel, at higher higher speeds, with with the help of special special modulation, using a unique signal processing technology. ISSUES WITH LIFI:
Researchers at the Fraunhofer Henrich Hertz Institute (HHI) in Germany have success successfully fully transmitted data at 3Gbps using conventional LED bulbs in a laboratory laboratory setting. In In a real-world setting (at a trade fair), the same system was capable of 500Mbps. The concept of visible light communications (VLC), or LiFi as it is sometimes known, has received a lot of attention in recent years, mostly due to the growing prevalence of LED of LED lighting. Unlike incandescent and fluorescent bulbs, LEDs are solid-state electronics, meaning they can be controlled in much the same way as any other electronic component, component, and switched at a high speed. VLC is essentially Wi-Fi — Wi-Fi — but but using terahertz radiation (light) instead of microwaves microwaves (Wi-Fi). Instead of oscillating a Wi-Fi transmitter, VLC oscillates an LED bulb — bulb — and and of course, on the receiving end there’s a photo a photo detector instead instead of an antenna. BENEFITS OF LIFI:
Li-Fi has the advantage of being able to be used in electromagnetic sensitive areas such as in aircraft, nuclear power plants, oil gas installations and
Since LiFi requires line-of-sight, when set up outdoors the apparatus would need to deal with ever changing conditions. Indoors, one would not be able to shift the receiving device. A major major challenge facing LiFi is how the receiving device will transmit back to the transmitter. POTENTIAL APPLICATIONS: APPLICATIONS:
LIFI can be used in places where it is difficult to lay optical fibers. For Example: in operation theatres. At traffic signals, LiFi can be used to communicate communicate with LED lights of cars, thus controlling traffic. In aircraft, the overhead lights can be used for data tr ansmission. ansmission. It can be used in petroleum or chemical chemical plants. plants. CONCLUSION:
The possibilities are numerous and can be explored further. if this technology can be put into practical use, every bulb can be used something like a Wi-Fi Hotspot to transmit wireless data and will proceed towards a Cleaner,Greener,Safer and Brighter future. .
