The document compares and contrasts Wi-Fi and Li-Fi technology. Wi-Fi uses radio frequencies to transmit data wirelessly, while Li-Fi uses light frequencies via LED bulbs. Both technologies have their advantages and disadvantages. Li-Fi offers higher bandwidth and more available spectrum than Wi-Fi, but it cannot transmit data in the dark and light cannot pass through objects as easily as radio frequencies. The document provides a brief history of both technologies and how they work at a high level. It also outlines some common applications and concludes that Li-Fi may help address bandwidth limitations and offer a cleaner wireless alternative.

1. In the name of Allah the most beneficent and the most merciful.

2. Group Members
Submitted to:
Mr. Aqib Asad
Introduction
to
Computing
NAME Roll No
Zeeshan Ali
Zain Siddique
Khizar Ali
F19-9050
F19-9055
F19-9046

4. Road Map ForThe Presentation
1.Wi-Fi 1. Li-Fi
2. History 2. History
3.Working ofWi-Fi 3. Working of LI-FI
4. Wi-Fi Protocols
5. Advantages
6.Disadvantages
4. Applications
6.Disadvantages
5. Advantages
vs.

5. Wi-Fi
• Commonly Used for connecting devices using radio signals
• Wireless Fidelity
• Alternative to wiredTechnology

6. History:
 Its all start in 1970 the electrical engineer Dr. Jhone
O’Sullivan also know as the “Father of the Wi-Fi”
 At the time , he and his team try to detect radio
signals from distant black holes in space .
 In 1990 Dr. Jhone O’Sullivan and his team decided to a give a
wireless networking a chance and with FFT( Fast Fourier
Transforms) Equation use and try different Experiments in 1995
and he invent basic or Wi-Fi
 The first wireless product that brought on the market under the
name “WaveLan” with speed of 1Mbps/2Mbps

7. Working of Wi-Fi:
• Wireless Adapter • Router:
• Server

8. IEEE:
INSTITUDE OF ELECTRICAL AND ELECTRONIC ENGINEERS
802
Wireless Standards
802.3 Ethernet
802.15 Bluetooth
802.11 Wi-Fi
Networking Standards:
FirstWi-Fi protocol:
802.11 1997 was the first wireless networking standard in the family
802.11
 Introduce in 1997
 Frequency 2.4 GHz
 Speed 1 or 2 (Mbit/s)

9. Wi-Fi sub Standards :

10. IEEE 802.11 a
 Introduced in 1999.
 Frequency 5GHz
 Range 10m
 Speed 54 (Mbit/s)
IEEE 802.11 b
 Introduced in 2001 .
 Frequency 2.4Ghz.
 Range 50m.
 Speed 15(Mbit/s)
IEEE 802.11 g
 Introduced in June 2003
 Frequency 2.4GHz
 (like 802.11b)
 Range 75m
 Speed 54 (Mbit/s)
 Introduced in 2007
 Frequency 2.4GHz & 5Hz
 Range 100-150m
 Speed 300(Mbit/s)
IEEE 802.11 n
IEEE 802.11 ac
 Introduced in 2013
 Frequency 5Hz
 Range 150m
 Speed 1(Gbit/s)

11. Advantages :
 Free Of wire.
 Easy implementation
 Mobility
 Less of cost
Disadvantages:
 Limited capacity
 Limited Availability
 Limited speed
 Insecure
 Harmful

12. Li-Fi
Technology

13. Introduction:
• LiFi data is transmitted by the LED bulbs and
received by photoreceptors.
• Uses LEDs for Data Transmission
• LiFi bulbs are outfitted with a chip that modulates the
light imperceptibly for optical data transmission

14. History
•Professor Harald Haas, from the
University of Edinburgh in the UK
Invented LiFi in 2011.
•Also Started a company Pure LiFi
•The first Li-Fi smartphone prototype
was presented at the Consumer
Electronics Show in Las Vegas from
January 7–10 in 2014.
Prof. Harald Haas
Father of Li-Fi

15. Components OF Li-Fi
Photoreceptor Source Provider LED Bulb
RF driver Power SupplyHub

16. Working of Li-Fi
• The LEDs can be switched on and off very
quickly.
• Switch ON Means “1”
• Switch OFF Means “0”
• Binary Language that also mean “0” and “1”.

17. Real Time Usage of Li-Fi

19. ss
LIGHT RadioWaves
ModemTransceiver
IrDA
Devices
Wi-Fi Devices

20. PPLICATIONS

21. Advantages Disadvantages
• Larger bandwidth.
• High efficiency.
• More availability.
• High security.
• High data transmission
rates of up to 10Gbps
can be achieved.
• Li-Fi has low implementation
and maintenance costs.
• Li-Fi doesn’t work in the dark
• Unlike Wi-Fi we cannot move
to other rooms unless there
are wired bulbs too.
• Light can’t pass through the
objects.
• High installation cost of the
VLC systems.
• How the receiving device will
transmit back to transmitter.

22. FUTURE DEVELOPMENTS
 Efficient alternative to radio-based wireless.
 Li-Fi is an emerging technology which is
quick and reliable.
 Air waves are clogged so let’s use light waves.
 Hence, let’s proceed to Li- Fi for a brighter,
cheaper and greener future.

23. Conclusion
 Every bulb can be used something like a Wi-Fi hotspot
to transmit wireless data
 Overcomes the limitations of radio spectrum.
 High speed of 10Gbps can be achieved.
 We will proceed toward the cleaner, greener, safer and
brighter future.
 This may solve issues such as the shortage of radio-
frequency bandwidth.

24. References
 http://whatis.techtarget.com/definition/LiFi
 http://www.dvice.com/archives/2012/08/lifi_ten_ways_i.php
 http://electronicsforu.com/electronicsforu
 http://purelifi.co.uk/what_is_li-fi/applicationsof_lifi/
 http://en.wikipedia.org/wiki/Li-Fi
 www.wikipedia.com
 www.google.com
 The.5za9.wordpress.com
 http://en.wikipedia.org/wiki/Li-Fi
 seminarprojects.com/s/seminar-report-on-Li-Fi
 http://teleinfobd.blogspot.in/2012/01/what-is-lifi.html
 echnopits.blogspot.comtechnology.cgap.org/2012/01/a- Li-Fi-world
 www.lificonsortium.org
 the-gadgeteer.com/2011/08/LI-FI

25. ANY