Li fi

Date:27/04/2015

Silent Assassins

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LIFI-TECHNOLOGY

Today’s Major Data Transmission

Technique❖ Today’s majority of data technique uses

Radio Spectrum .

❖Drawbacks of Radio Spectrum

● The fact that it is congested and the demand

for wireless data double each year.

● Every thing , it seems want to use wireless

data but the capacity is drying up.

● Availability :It is available within the range of

Base stations and unavailable in aircrafts.

● Efficiency: Consumes huge amount of

energy for transmitting radio waves and to

cool the base station cabins

● Security: Less secure as it can also pass

through walls.

What is LI-FI● LI-FI stands for “Light Fidelity”.

-It is the transmission of data through

illumination.

-Sending data through a Light Emitting Diode

which varies in intensity faster than human

eye can follow to deliver high speed data

transmission.

History

● The technology truly began

during the 1990's in countries

like Germany, Korea, and

Japan.

● Where they discovered LED's

could be retrofitted to send

information.

● Harald Haas continues to the

world with the potential to use

light for communication.

Introduction ● It is a Visible Light Communication(VLC)

technology developed by scientists including

Dr. Gorden Povery, Prof Harald Hass and

Dr. Mostafa Afgani at University of

Edinburgh .

● These devices are normally used for

illumination by applying a constant current

through the LED.

● Li-fi is the term used for fast and cheap light

based Wi-Fi but it uses light rather than radio

waves.

Availability of Medium

How LiFi Works

● operational procedure is very simple, if the

led is on, you transmit a digital 1, if its off

you transmit a 0.

● The LEDs can be switched on and off very

quickly, which gives nice opportunities for

transmitting data.

● Hence all that us required is some LEDS

and a controller that code data into those

LEDs.

How LiFi is Different from Others?

● Li-fi is based on LEDs for the transfer of data.

● The transfer of data can be with the help of all

kinds of light ,no matter the part of spectrum

that they belong to.

● The speed of the internet is incredibly high and

one can download movies ,games ,etc. in just a

few minutes.

● It also removes the limitation to be in a region

where Wi-Fi is only present.

LiFi vs WiFi

Various Transmitting Elements

● Light emitting diodes● Study lamps● LED lamps

Various Receiving Elements

Potential Applications of LiFi

1.In House Communication :Giga shower

● For giga speeds technologies ,the Li-fi consortium has

defined Giga Shower ,Giga MIMO and Giga Spot.

● It provides bidirectional data services via several

channels to multiple users.

● This is like watching TV channels or listening to different radio stations where no uplink channel is needed.

2.Traffic Lights

● Traffic lights can communicate to each other and

vehicles.

● Cars ,Traffic lights and other vehicles too have LED-

based headlights so data can be easily transmitted to

each other.

3.In Aircraft cabins

● This is one of the advantage of li-fi as it could be

used in aircrafts because Wi-Fi can not be used

there.

4.Hospitals

● In hospitals li-fi can be used in those instruments

which are capable of light emitting and used for

data transmission.

6.Street lamps as free access points

● As there are million of street lamps deployed each

of them can be used as free access points for

internet and fast data transmission also.

Advantages of LiFi

➔ Higher Bandwidth (almost 10000 times more)

➔ Availability

➔ Efficiency

➔ High Security

➔ Easy to use

➔ Fast data transfer

➔ Harmless

➔ Low cost

➔ High capacity

Limitations infront of LiFi

➢Light can not pass through objects.

➢A major challenge facing Li-fi is how the

receiving device will transmit back to the

transmitter.

➢High initial cost of VLC systems.

➢ Interferences from external light sources like

sun ,normal lights and opaque materials.

LiFi Equipment

● PureLiFi demonstrated the

first commercially available

Li-Fi system, the Li-1st, at

the 2014 Mobile World

Congress in Barcelona.

● The product offers full

duplex communication with

a capacity of 5Mbps in both

the downlink and uplink

over a range of up to three

metres.

● Li-1st offers a simple plug-and-play solution for secure

wireless point-to-point Internet access with a wide range of

LED luminaires.

Further Enhancements

● Further enhancements can be made in this like

using an array of LEDs for parallel data

transmission or mixtures of red , green and blue

LEDs to alter the light’s frequency encoding a

different channel.

● Such development promise a theoretical speed

of 10 Gbps-meaning one can download a full

high-definition film in just few seconds.

Conclusion

❖ The possibilities are numerous and can be

explored further.

❖ If this technology can be used to practicality

,every bulb can be used for something like a

Wi-Fi hotspots to transmit wireless data.

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