Li-Fi Technology

Li-Fi Technology 


Abstract-Now-a-days, internet has become a major demand people are in search of Wi-Fi hot spots. Li-fi or Light Fidelity was invented by Professor Harald Hass of university of Edinburgh. This is the latest technology in present day communication system which makes the use of LEDs, Light Emitting Diodes that helps in the transmission of data much more faster and flexible than the data that can be transmitted through Wi-Fi. It is basically a 5G technology of visible light communication system which utilizes light emitting diodes as a medium of high speed communication in similar manner as Wi-Fi.

Now-a-days, internet has become a major demand people are in search of Wi-Fi hot spots. Li-fi or Light Fidelity was invented by professor Harald Hass of university of Edinburgh. This is the latest technology in present day communication system which makes the use of LEDs, Light Emitting Diodes that helps in the transmission of data much more faster and flexible than the data that can be transmitted through Wi-Fi. It is basically a 5G technology of visible light communication system which utilizes light emitting diodes as a medium of high speed communication in similar manner as Wi-Fi.This idea works very simply, if the led is on then logic “1” will be transmitted and if the led is off then logic “0” will be transmitted also, LEDs can be switched on and off very quickly which adds onto another advantage.


DESIGN of Li-Fi


Li-Fi architecture consists of a number of LED bulbs or lamps including many wireless devices such as Mobile Phones, Laptops and PDA. The following factors should be taken into concern while designing Li-Fi:
 1. Presence of light.
 2. Line of sight (LOS).
 3. For better performance use fluorescent light and LED.
 4. A photo detector received data.
Hence all that is required is some LEDs and a controller that will code data into those LED switch

FEATURES


Bandwidth:

    The visible light spectrum is plentiful, much more than RF and also is free to use.

Data Density:

    Li-Fi can achieve 1000 times the data density of Wi-Fi, as visible light can be well contained in the light illumination but in case of RF it suffers from interference.

High Speed: 

   A very high speed of data access can be achieved from Li-Fi as it is free from interference and also is having a very large bandwidth. 

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