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Li fi technology
This document provides an overview of Li-Fi technology. It begins with defining Li-Fi as a wireless technology that uses light from LED bulbs to transmit data. The document then discusses the history of Li-Fi, which was first proposed in 2004 by Harald Haas. It explains how Li-Fi works by modulating the intensity of light from an LED bulb to transmit bits. The document compares Li-Fi to Wi-Fi, noting Li-Fi has advantages like higher security, bandwidth and energy efficiency. Potential applications of Li-Fi include use in aircraft, hospitals and traffic lights. Limitations include inability to work in darkness and potential interference from light sources. Future developments could make Li-Fi an efficient alternative to
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Li fi technology
- 1. LI-FI TECHNOLOGY BY :- RISHABHRANJAN U. ROLL:- 1519240187 G.L.BAJAJ INSTITUTE OF TECHNOLOGY AND MANAGEMENT
- 2. CONTENTS Introduction to LI-FI Historyof LI-FI Implementation How it works LI-FI vs WI-FI Application Advantages Limitation of LI-FI Future Developments Conclusions
- 3. FI….???WHAT IS LI- FI? LIFI –”LIGHT FIDEALITY” is transmission of data through illumination, i.e. sending data through a LED light bulb that varies in intensity faster than human eye can follow. Li-Fi is a light based Wi-Fi it uses light instead of radio waves to transmit information.
- 4. HISTORY :- Harald Hass, a professor at the University of Edinburgh who began his research in the field in 2004, gave a debut demonstration of what he called a Li-Fi prototype at the TED Global conference in Edinburgh on 12th July.
- 5. : WORKING PRINCIPLE OFLI-FI :-
- 6. HOW LI-FI WORKS Operationalprocedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. a Thus every light source will work as a hub for data transmission.
- 7. LIFI/WIFI COMPARISON PARAMETER 1. Speed 2.Range 3. Data density 4. Security 5. Transmit/receive power 6. Device-to-device connectivity 7. Reliability 8. Obstacle Interference LI-FI High Low High High High WIFI High Medium Low Medium Medium High Medium High High Medium Low
- 8. APPLICATIONS - Used formodern medical instruments. In aircrafts, it can be used for data transmission. Used in petroleum or chemical plants where other transmission or frequencies can be hazardous. In traffic signals, LI-FI can be used which will communicate with the LED lights of the car and number of accidents can be decreased. Underwater communication. RF Spectrum relief. Li-Fi can be used effectively in the places difficult to lay the optical fiber cable. where it is
- 9. nverted ADVANTAGES - Larger bandwidth. Highefficiency. More availability. High security. Thousands and millions to Li-Fi spots. No license needed. of street lamps can be co Green information technology. Lighting points used as Hotspots. The issues of the shortage of radio frequency bandwidth may be sorted out by Li-Fi. This technology worldwide can be used for every street lamp would be a free data access points.
- 10. LIMITATIONS - Li-Fi doesn’twork in the dark . Li-Fi has a big drawback compared to Wi-Fi, unlike Wi-Fi we cannot move to other rooms unless there are wired bulbs too. Light can’t pass through the objects. Interference from external sources like sun light, normal bulbs, and opaque materials in the path of transmission will course interruption in the communication. High installation cost of the VLC systems. A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.
- 11. FUTURE DEVELOPMENTS:- Efficient alternativeto radio-based wireless. Li-Fi is an emerging technology which is quick and reliable. Hence, let’s proceed to Li- Fi for a brighter ,cheaper and greener future.
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