LI-FI TECHNOLOGY

1. 17th ISTE NATIONAL CONVENTION.
“SUSTAINABLE DEVELOPMENT THROUGH INNOVATIVE TECHNOLOGY”
ISTE

2. Overview:
INTRODUCTION TO WIRELESS COMMUNICATION:
HISTORY & APPLICATION OF WIRELESS COMMUNICATION:
4 ISSUES WITH RADIOWAVE:
ALTERNATIVE FOR RADIO WAVE:
INTRODUCTION OF LI-FI:
COMPARISON WITH WI-FI:
APPLICATION OF LI-FI:
LI-FI FOR SUSTAINABILITY:
02

3. 1. WIRELESS COMMUNICATION .
`
Wireless communication is the transfer of information between
two or more points that are not connected by an electric
conductor.
- PRESENTED BY:
VIVEK KUMAR(CSE,ABIT)
PAWAN KUMAR(CSE,ABIT)
03

4. 04HISTORY & APPLICATION OF WIRELESS COMMUNICATION.
Wireless communication was introduced around 1880.
Marconi and Graham bell introduced wireless communication.
Applications are:
Bluetooth
wi-fi (internet connection)
mobiles
remote and many more.

5. 05ISSUES WITH RADIO WAVE
CAPACITY
WITH THE ADVENT OF NEW TECHNOLOGIES LIKE 3G ,4G WE ARE RUNNING OUT OF SPECTRUM.
THAT’S WHY RADIO WAVES ARE NOW BECOMING EXPENSIVE.
EFFICIENCY
THERE ARE 1.4 MILLIONS CELLULAR RADIO BASE STATIONS .
EFFICIECY OF EACH BASE STATION IS JUST 5%.
MOST OF THE ENERGY IS NOT USED FOR TRANSMISSION BUT RATHER FOR COOLING DOWN THE
BASE STATION.

6. 06ISSUES WITH RADIO WAVE
SECURITY
RADIO WAVES CAN PENETRATE THROUGH WALLS AND HENCE CAN BE INTERCEPTED.
ANYONE WITH KNOWLEDGE AND BAD INTENTION CAN MISUSE IT.
AVALILABLITY
WE HAVE TO SWITCH OFF MOBILES IN AIRCRAFTS.
IT IS ALSO NOT ADVISABLE TO USE MOBILES AT PETROL PUMPS.

7. 07
BUT ,WIRELESS COMMUNICATION PRODUCES
HARMFUL RAYS (RADIO WAVE) .

8. 08ALTERNATIVE OF RADIO WAVES ?
CAN IT BE INFRARED WAVES ? ----- NO
INFRA RADIO WAVES ARE HARMFUL FOR OUR EYES HENCE USED TO
VERY LOW POWER.
 CAN IT BE ULTRA VIOLET RAYS ? ----- NO
UV RAYS ARE HARMFUL FOR OUR SKIN AND CANNOT BE USED FOR LONG
DURATION.

9. 09
CAN IT BE GAMMA RAYS ? ----- NO
GAMMA RAYS ARE RADIOACTIVE AND ARE DANGEROUS.
CAN IT BE X-RAY S ? ----- NO
Health problems so can’t be used.
ALTERNATIVE OF RADIO WAVES
SO WE ARE LEFT ONLY WITH VISIBLE LIGHT SPECTRUM.

10. L I G H T-F I D E L I T Y.
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11. INTRODUCTION TO LI-FI
LI-FI IS A TECHNOLOGY THAT USES THE LIGHT EMITTING DIODES TO TRANSMIT THE
DATA WIRELESSLY.
LI-FI IS FAST AND CHEAP OPTICAL VERSION OF WI-FI ,BASED ON VISIBLE LIGHT
COMMUNICATION(VLC).
VLC IS A DATA COMMUNICATION MEDIUM,WHICH USES THE VISIBLE LIGHT BETWEEN
400 THZ (780 NM) AND 800 THZ (375 NM) AS OPTICAL CARRIER FOR DATA
TRANSMISSION.
11

12. LI-FI WORKING
ENVIRONMENT 12

13. HOW DOES LI-FI WORKS
? 13

14. PRACTICAL
IMPLIMENTATION OF LI-FI 14

15. THESE LED’S VARIES IN INTENSITY (THAT IS GETS ON AND OFF) SO FAST
THAT A HUMAN EYE CANNOT DETECT IT.
IF LED IS ON , THEN WE TRANSMIT A DIGITAL SIGNAL 1,AND IF THE LED IS
OFF , THEN WE TRANSMIT A DIGITAL SIGNAL 0.
A CONTROLLER IS CONNECTED AT THE BACK SIDE OF THESE LED BULBS TO
CODE DATA TO THESE LED’S.
15HOW DOES LI-FI WORKS ?

16. 16Li-Fi VS Wi-Fi
LI-FI
Li-Fi has a High speed data
transfer rate over 1Gbps +.
LI-FI Uses the Visible Light of the
electromagnetic waves.
Li-fi is cheaper than wi-fi.
Li fi has almost no limitation
on capacity.
WI-FI
Wi-Fi has a data transfer rate
of maximum 54Mbps.
WI-FI use the radiowaves portion
of the Electromagnetic waves.
Costlier than li fi.
Wi-fi is closed to full capacity.

17. 17
1. CAPACITY:
10000 TIMES MORE SPECTRUM THAN RW.
LIGHT BOXES ARE ALREADY PRESENT, SO INFRASTRUCTURE IS AVAILABLE ALREADY AND INSTALLED.
2. EFFICIENCY:
HIGHLY EFFICIENT BECAUSE LED CONSUMES LESS ENERGY.
3. AVAILABLITY:
LIGHT IS PRESENT EVERYWHERE.
DATA IS PRESENT WHERE LIGHT IS PRESENT.
OVERCOMING THE FOUR ISSUES WITH RW IN LI-FI

18. 18
4. SECURITY:
LIGHT WAVES DOESNOT PENETRATE THROUGH WALLS.
HENCE THEY CAN’T BE INTERCEPTED.
OVERCOMING THE FOUR ISSUES WITH RW IN LI-FI

19. 19
WE CAN USE LI-FI IN HOSPITALS AND AIRCRFTS ALSO.
CHEAPER THEN WIFI , SINCE VISIBLE LIGHT SPECTRUM IS A FREE SPECTRUM BAND.
NO LICENSE NEEDED.
THOUSANDS AND MILLIONS OF STREET LAMPS CAN BE CONVERTED TO LI-FI SPOTS.
CAN CONTROL ROAD ACCIDENTS BY USING CHAIN TRAFFIC SIGNALS .
CAN BE USED AS ONLINE OR INTERNET CAMERA.
ADVANTAGES OF LI-FI

20. 20CONCLUSION
The best way to predict the future is to create it and future belongs to
those who creates it.
The possibilities are numerous and can be explored further .If this
Technology can be put into practical use , Every bulb or LED can b e
used something like a wi -fi hotspots to transmit wireless data. we will
proceed toward the cleaner, greener, safer and brighter future.

21. 21
ANY QUERIES
?

22. 22
Li-fi