Lifi

lifiName: Abdelrahman Alaa MostafaSubbmitted to Ms. passant

What is lifi?

• li-fi is a technology that uses the light emitting diodes to transmit the data wirelessly.

Who invented it?

• 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 wow the world with the potential to use light for communication .

Working Process• The working process 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. We have to just vary the rate at which the LED’s

• Thus every light source will works as a hub for data transmission

continue

Li-Fi vs Wi-Fi

advantages• Larger bandwidth ( 10,000 times the radio

bandwidth ).• High speed data rate .• High efficiency .• Highly secure.• Works even under water in sea.• Safe for health .• More availability.• Low cost solution.

applications• Traffic lights:• where Traffic lights can communicate to the car

and with each other. Cars have LED-based headlights, LED-based cack lights, and cars can communicate with each other and prevent accidents in by exchanging information.

In industry:• Visible Light is more safe than RF, hence it can be

used in places where RF can't be used such as petrochemical plants .

Airlines :• Whenever we travel through airways we

face the problem in communication media ,because the whole airways communication are performed on the basis of radio waves. To overcome this drawback on radiowaves , li-fi is introduced

On Ocean Beds:• Li-Fi can even wok underwater were Wi-Fi fails

completely, thereby throwing open endless opportunities for military/navigation operations.

In steet lamps:• There are millions of street lamps deployed

around the world.• Each of these street lamps could be a free access

point.

Limitations:•Presence of light is essential.•There should be line of sight•Works better with fluorescent light and LEDs but very low efficiency with Bulbs.

Is it a proven technology?

• Yes, this is already proven.• Dr. Harald Hass demonstrated his

invention using an ordinary table lamp that successfully transmitted data at speeds exceeding 10Mbps .• To prove that the light bulb was the

source of data stream, he periodically blocked the beam of light, causing the connection to drop.

conclusion• The possibilities are numerous and can be

explored further. If this technology can be put into practical use, every bulb can be used something like Wi-Fi hotspot to transmit wireless data and we will proceed onwards the Cleaner, Greener, Safer and Brighter future.

references• http://en.wikipedia.org/wiki/Li-Fi• http://www.bbc.com/news/technology-24711935• http://www.extremetech.com/computing/152740-

researchers-create-3gbps-lifi-network-with-led-bulbs

• http://www.ijircce.com/upload/2013/october/8LiFi.pdf

• http://www.inteligentcomp.com/2013/03/wireless-data-from-LED-bulbs.html

• http://www.theregister.co.uk/2012/05/24/wtf_is_lifi_visible_light_communications?page=1

• http://renergytestblog2.blogspot.com/2013/05/internet-access-through-led-bulb-li-fi.html

• http://visual.ly/li-fi-how-does-it-work