Li-Fi known as the Light-Fidelity technology is one one of the upcoming new trends in the field of wireless networks and communication.
The term Li-Fi was coined by prof. Harald Hass during the TED Global talk.This technique is a bi-directional,high speed and fully networked wireless communication.This is similar to what we have now the Wi-Fi Technology.
Li-Fi uses optical Wireless communication for seamless fast data transfers and can be a compliment to RF communication or a huge replacement to contexts of data broadcasting.
Existing Wireless Technology and need of the new Li-fi:
In Existing Wireless technology Wi-fi,due to the increase in the internet usage the traffic load increases and Wifi does not cope up with the heavy data.
The disadvantages of Wifi-are
Working of Li-Fi
The function of Li-Fi is simple yet amazing. Just two things are needed:
1) An LED which acts as a light source.
2) A photo detector for capturing light source.
The term Li-Fi was coined by prof. Harald Hass during the TED Global talk.This technique is a bi-directional,high speed and fully networked wireless communication.This is similar to what we have now the Wi-Fi Technology.
Li-Fi uses optical Wireless communication for seamless fast data transfers and can be a compliment to RF communication or a huge replacement to contexts of data broadcasting.
Existing Wireless Technology and need of the new Li-fi:
In Existing Wireless technology Wi-fi,due to the increase in the internet usage the traffic load increases and Wifi does not cope up with the heavy data.
The disadvantages of Wifi-are
- It covers only a small distance.
- More traffic slow speed.
- Its Costly.
To Overcome these disadvantages Li-Fi technology was introduced which has the following advantages
- Capacity.
- Efficiency.
- Availability.
- Security.
- Covers large areas.
- It had high traffic handling capability.
- Its cheaper than the Wi-Fi technology.
How the Data is transmitted in Li-Fi
The data in Li-Fi is transmitted through LED's (Light Emitting Diode's) which changes its intensity faster than human eyes and the intensity is captures by a detector.The estimated data transfer speed in 10GBps.
The function of Li-Fi is simple yet amazing. Just two things are needed:
1) An LED which acts as a light source.
2) A photo detector for capturing light source.
When light source starts to emit light,the light sensor on the other end will detect it and records a binary 1 on success and 0 on failure.LED flashes certain time and builds up a message. Light
censor detects the light flashing of light and receives the
message.
Image courtesy:Dzone.com
Advantages of Li-Fi:
- Radio Waves generated by Wi-Fi are harmful for human beings as they might penetrate through the body.Li-fi does not cause these effects as its just a source of light.
- It Works under water ,so it is beneficial in many fields.
- It had tremendous data transfer rates.
- It is very secure since the signal cannot penetrate through walls.
Dis-Advantages of Li-Fi:
- Since the light cannot penetrate through walls the user needs to install separate LED's in every place he needs to access the data.
- Only works if there is direct line of sight between source and receiver.
Applications of Li-Fi:
- Underwater Communications: Since radio waves cannot be used under water because these waves are strongly absorbed by sea water within feet of their transmission and this renders it unusable underwater but LI-Fi is suitable for underwater communication.
- Safety and management: It can be used to update all the traffic loads at every instant and hence maintain traffic.
- Security: The Li-Fi technology is very secure as it cannot penetrate through walls.
- Health Sector: Since Wi-Fi cannot be used in hospitals and other health care units,Li-Fi replaces it most of the health sectors for communication.
- Internet Everywhere: Since it requires just an LED for the data transfer even it can be implemented in street lights,roads,malls etc.
References:
1) A new era of Wireless Communication Data Sharing by Birender Singh Rawat, Brijesh Aggarwal, Dishant Passi.
2) Jyoti Rani, Prerna Chauhan, Ritika Tripathi, “Li-Fi (Light
Fidelity)-The future technology In Wireless
communication”, International Journal of Applied
Engineering Research, vol. 7 No.11, 2012,ISSN 0973-
4562.
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