International Journal of Research In Science & Engineering
Volume: 2 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
LI-FI Technology
Akash Lawande , Amol Pawar , Dr. Mahendra Kondekar
Student
Akash Lawande, MCA, MIT(E) Aurangabad, [email protected]
Amol Pawar, MCA, MIT(E) Aurangabad, [email protected]
HOD
Dr Mahendra Kondekar, MCA, MIT(E) Aurangabad, [email protected]
Student
ABSTRACT
Li-Fi stands for Light-Fidelity. Li-Fi technology, proposed by the German physicist Harald Haas, provides
transmission of data through illumination by sending data through an LED light bulb that varies in intensity
faster than the human eye can follow . As light is everywhere, using light as the transmission medium Li-Fi can
provide wireless indoor communication. The data transfer through LIFI is in bits and is much faster than Wifi.
LIFI uses visible light for communication instead of radio waves, as a medium to high-speed communication in a
similar manner as WI-FI .
----------------------------------------------------------------------------------------------------------------------------1. INTRODUCTION
Write The most important day-to-day activities in this fast world are the transfer of data and information.
As the world is becoming faster the need of fast data transmission is also increasing. As the numbers of devices that
access to the internet are increasing, the limited bandwidth leads to decrease in the speed of the data transfer.
LI-FI Bulb
To give a solution to this problem Li-Fi technology is introduced. Li-Fi stands for Light Fidelity. It
provides better bandwidth, efficiency, availability and security than Wi-Fi and thus increases the data transfer speed.
Li-Fi technology provides transmission of data through illumination by taking the fibre out of fibre optics
by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It uses
visible light instead of Gigahertz radio waves for data transfer which makes it fast and cheap mode of wireless
communication.
2. LITERATURE REVIEW
In Wi-Fi technology user depends upon the source like routers but in case of Li-Fi it is not. The Li-Fi
technology uses light as a source for data transfer while Wi-Fi uses a radio signal which is unable to use underwater
for data transmission. We know light can pass through water, hence Li-Fi is helpful for underwater data
transmission. In Wi-Fi technology data can easily hacked because of radio waves can penetrate through the walls but
in case of Li-Fi data are more secured as light cannot penetrate through the walls.
IJRISE| www.ijrise.org|[email protected]
International Journal of Research In Science & Engineering
Volume: 2 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
3. METHODS AND DATA
3.1 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
3.2 Implementation of Li-Fi
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. The LEDs are used for
illumination only on applying a constant current to them. However, by fast and subtle variations of the current, the
optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi
technology setup. It’s operation is very simple as when the LED is on then a logic “1” is transmitted and when the
LED is off then a logic “0”is transmitted. This so happens at a very fast rate flickering of LED which is not visible
to the human eye. Further enhancements can be made in this method, like using an array of LEDs for parallel data
transmission, or using mixtures of red, green and blue LEDs to alter the light’s frequency with each frequency
encoding a different data channel.
Implementation Of Li-Fi
IJRISE| www.ijrise.org|[email protected]
International Journal of Research In Science & Engineering
Volume: 2 Issue: 3
e-ISSN: 2394-8299
p-ISSN: 2394-8280
4. ANALYSIS
4.1 Advantages Of Li-Fi Over Wi-Fi
1. Li- Fi uses light rather than radio frequency signals so are intolerant to disturbances.
2. There are billions of bulbs worldwide which just need to be replaced with LED’s to transmit data.
3. Security is a side benefit of using light for data transfer as it does not penetrate through walls.
4. Integrated into medical devices and in hospitals as this technology doesn’t deal with radio waves, so it can easily
be used in all such places where Bluetooth, infrared, Wi-Fi and internet are broadly in use.
5. The issues of the shortage of radio frequency bandwidth may be sorted out by Li-Fi.
4.2 Challenges Of Li-Fi Technology
1. LI-FI requires Line of Sight
2. Light waves can easily be blocked and cannot penetrate thick walls like the radio waves can.
3. We become dependent on the light source for internet access. If the light source malfunctions, we lose access to
the internet.
5. CONCLUSION
Li-Fi is an emerging technology and hence it has vast potential and increasing use of the internet services,
possibities are very high that use of Lifi technology will be soon in practice. Every bulb will be replaced by Lifi
bulbs and might be used like a wifi hotspot for the transmission of data. The use of lifi technology gives a very
golden opportunity to replace or to give alternative to the radio based wireless technologies.With the use of LEDs
the information can be transmitted at very high rates with just the simple turning on and off of the LEDs. This
technology is not only free to use but also provides a safe and secure access.
REFERENCES

http://en.wikipedia.org/wiki/Li-Fi

Ravi Prakash, Prachi Agarwal “The New Era of Transmission and Communication Technology : Li-Fi
(Light Fidelity) LED & TED Based Approach”, International Journal of Advanced Research in Computer
Engineering &

Jitender Singh, Vikash “A New Era in Wireless Technology using Light-Fidelity” International Journal of
Recent Development in Engineering and Technology ISSN 2347-6435(Online) Volume 2, Issue 6, June 2014

I. “LI-FI” the latest technology in wireless” IJCCE,vol 2 issue 3, july,2012.

www.lificonsortium.org.

Seminarprojects.com/s/seminar-report-on-lifi
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