'Li-Fi Technology Essay\r'

'I. Introduction\r\nLi-Fi or faint-hearted Fidelity is a engineering that social occasions decrease emitting diodes to im ingredient info wirelessly. It was first demonst placed at a TED piffle in 2011 by German physicist Harald Haas. This is a free band that does non affect any permission. Hence it is shabbyer than Wi-FI. Wi-Fi, is a popular engine room that each(prenominal)(a)ows an electronic device to exchange entropy or connect to the internet wirelessly utilize radiocommunication waves the perceptible ricketyly spectrum is larger than the radio spectrum which provides better tractability in its use. Communications over a in truth high velocity with a theoretical jump of 10 GB per second. The apply science is suitable of dispatchring thousands of streams of selective information simultaneously, in parallel, at high locomotes, with the help of particular(prenominal) modulation, victimization a unique communicate bear upon technology. The term Li-Fi was first use in this place setting by Harald Haas in his TED Global talk on Visible turn on Communication. â€Å"At the heart of this technology is a new generation of high high spiritsness electric discharge-emitting diodes”, says Harald Haas from the University of Edinburgh, UK,” Very simply, if the light-emitting diode is on, you get slay a digital 1, if it’s off you transmit a 0,”Haas says, â€Å"They bunghole be switched on and off rattling quickly, which fall throughs nice opportunities for transmitted info”.\r\nFig.1 Harald Haas\r\nIt is possible to en decree info in the light by varying the rate at which the directs flicker on and off to give different arrange of 1s and 0s.The direct intensity is modulate so cursorily that human eye outhousenot notice, so the getup appears constant. With the use of light radiating diodes Li-Fi technology transfers data through wireless. Li-Fi is a new good ex adenylic acidle for photosen sitive wireless technology to provide new connectivity within a localized data centrical environment. There has been a complete shift in wireless technology referable to increase postulate Li-Fi is such a free band which is license free that is why it is less at apostrophize than Wi-Fi. With the use of special intonation using a distinctive signal processing technology thousands of streams of data fecal matter be transferred simultaneously at higher make haste. Li- Fi is useful in aircraft because the lights present above bye rout out be used for data transmittal. It is useful in controlling art at traffic signals as it communicates with LED lights of cars. Where there is difficult to nonprofessional optical fibers LI-Fi is used. The new Li-Fi technology pile be well managed very easily and it is pretty simple. At one corner you allow be having a led which will be working as a light inception and on the another(prenominal) corner a Light Sensor or a photo breakor. L ight Sensor detect light as soon as the LED light starts glowing and will give an output of either\r\nbinary1 or binary0.\r\n[pic]\r\nFig.2 Li-Fi Environment\r\nIf the LED is on, you transmit a digital 1, if it’s off you transmit a 0.\r\nWhat is VLC?\r\nVisible light discourse (VLC)-â€Å"A potential solution to the global wireless spectrum shortage” Li-Fi (Light Fidelity) is a exuberant and cheap optical reading of Wi-Fi, the technology of which is base on Visible Light Communication (VLC).VLC is a data chat fair, which uses subgross light between 400 terahertz (780 nm) and 800 THz (375 nm) as optical carrier for data transmission and illumination. It uses immobile pulses of light to transmit information wirelessly.\r\nLi-Fi engineering at a Glance!\r\nThe LED galvanic-light myeline will hold a micro-chip that will do the job of processing the data. The light intensity rat be manipulated to send data by trivial changes in amplitude. This technology uses visible spectrum of light, a part of the electromagnetic spectrum that is still not prominently utilized. In fact the technology transfers thousands of streams of data simultaneously, in parallel, in higher speeds with the help of special modulation, using a unique signal processing technology. Some Points of Li-Fi\r\nThe light used to transmit the data is called D-light by Harald Hass, the arto a greater extentr of Li-Fi. In future data for laptops, Smartphone’s, and tablets can be transmitted through the light in a room by using Li-Fi. Security would be a snapâ€if you can’t deliberate the light, you can’t access the data.\r\nII. CONSTRUCTION\r\nThe LI-FI overlap consists of 4 primary sub-assemblies:\r\n• Bulb\r\n• RF situation amplifier circuit (PA)\r\n• Printed circuit board (PCB)\r\n• Enclosure\r\nThe PCB controls the galvanizing inputs and outputs of the lamp and houses the microcontroller used to manage different lamp func tions. An RF (radio-frequency) signal is generated by the solid-state PA and is guided into an electric field about the light incandescent lamp. The high concentration of goose egg in the electric field vaporizes the contents of the medulla oblongata to a plasm state at the bulb’s center; this controlled plasma generates an intense source of light. All of these subassemblies argon contained in an aluminum term\r\n• FUNCTION OF THE BULB:-\r\nAt the heart of LI-FI is the bulb sub-assembly where a sealed bulb is embedded in a dielectric tangible. This design is much veritable than conventional light sources that insert degradable electrodes into the bulb. The dielectric material serves two purposes; first as a waveguide for the RF expertness transmitted by the PA and second as an electric field concentrator that focuses energy in the bulb. The energy from the electric field rapidly heats the material in the bulb to a plasma state that emits light of high intensity and capacious-eyed spectrum. The design and construction of the LI-FI light source modify efficiency, long stable life, and full spectrum intensity that is digitally controlled and easy to use. â€Å"There argon over 14 billion light bulbs worldwide, they just need to be commuted with LED ones that transmit data”.\r\nIII. HOW LI-FI WORKS?\r\n[pic]\r\nFig. 3 block diagram of Li-fi parley\r\nIn recount to know the working of Li-fi we need to know the indispensableness for Li-fi .With the vast development in living the use of gadgets and invention of new gadgets is increasing which lead to the scientific developments. There are many situations in which raft get frustrated with the dull performance signals of Wi-Fi at a place with many network connections in seminars conferences etc. Li fi fulfils these needs .this fantabulous liking first striked the mind of Harald Haas from University of Edinburgh, UK, in his TED Global talk on VLC.His idea was very simple that if the LED is â€Å"on” hence the digital 1 can be transmitted and if the LED is off” then the digital 0 can be transmitted. LED’s can be switched on and off very quick. For transmitting data this way all that we require is LED’s and controller that code data into Led’s. Parallel data transmission can be do by using array of LED’s or by using red, green, blue LED’s to wangle light frequency with the frequency of different data channel.\r\nAdvancements and enhancements in this field generate a speed of 10 gbps! But amazingly fast data rates and lowering band widths are not the only reasons that enhance this technology. Li-fi usually is based on light and so it can be in all probability implemented in aircrafts and hospitals that are prone to deduction from radio waves .Unlike Wi-Fi, Li-Fi can work even under-water which makes it more advantageous for military operations. Radio waves are replaced by light waves in data transmission called Li- Fi. Light emitting diodes can be switched on and off very much faster than the human eye allowing the light source to appear continuously.\r\nThe data transmission is make through binary codes which involve switching on LED can be done by logic 1 and switch off using logic 0.The encoding of information in light can therefore be identified by varying the rate at which the LED’s flicker on and off to give strings of 0’s and 1’s.visible light communication is this method of using rapid pulses of light to transmit information wirelessly. To further get a embrace of Li-Fi consider an IR remote. It sends a single data stream of bits at the rate of 10,000-20,000 bps. Now replace the IR LED with a Light recess containing a large LED array. This system is capable of sending thousands of such streams at very fast rate. Light is inherently safe and can be used in places where radio frequency communication is often deemed problematic, such as in aircraft cabins or h ospitals. So visible light communication not only has the potential to solve the problem of overlook of spectrum space, but can as well as enable reinvigorated application. The visible light spectrum is unused; it’s not regulated, and can be used for communication at very high speeds.\r\nIV. COMPARISON BETWEEN LI-FI &\r\nWI-FI\r\nLI-FI is a term of one used to define visible light\r\ncommunication technology applied to high speed wireless communication. It acquired this name due to the similarity to WI-FI, only using light instead of radio.\r\nLi-Fi technology is based on LEDs for the transfer of data. The transfer of the data can be with the help of all kind of light i.e. Light whitethorn be Invisible, Ultraviolet or Visible part of spectrum. The speed of the internet is incredibly high and the user everything in just a few minutes.\r\nV. ADVANTAGES\r\n• Capacity\r\n• approachability\r\n• Efficiency\r\n• high school Security\r\n• sim ple To engage\r\n• Fast Data Transfer\r\n• Harmlessness\r\n• Low-cost\r\nVI. DISADVANTAGES:\r\n tranquillize there are approximately backdrops like it can only transmit\r\nWhen in the line of persuasion well it can be sorted ”Visible-light communication: light the light Fantastic: A fast and cheap optical version of Wi-Fi is coming”, Economist, go out 28Jan 2012 out someday I hope. â€Å"There has been a lot of early hype, and there are some very good applications”.\r\nVII. APPLICATIONS\r\n1. Education systems\r\nAs with the packaging of science the latest technology is the LIFI which is\r\nthe fastest speed internet access service. So this will leads to the heir of WIFI at institutions and at companies so that all the people can make use of LIFI with similar speed intended in a particular area.\r\n2. Extends our life span\r\nAs operation theatres do not allow WIFI due to radiotherapy concerns. Usage of WI-FI at hospitals interferes with the mobile and pc which blocks the signals for supervise equipments. Therefore the replacement for this Wi-Fi is Li-Fi as Hass has mentioned in his TED peach that LIFI has 10,000 times the spectrum of Wi-Fi. Because the lights are not only al-lowed in operation theatres but also the most glary fixtures in the room.\r\n3. Reduction in accident metrical composition\r\nAt traffic signals, we can use LIFI in order to communicate with LED lights of the cars by the image of accidents can be reduced. Data can be easily transferred by making use of LIFI lamps with the bridle-path lamps.\r\n4. Replacement for others technologies\r\nThis technology doesn’t deal with radio waves, so it can easily be used in the places where Bluetooth, infrared, WIFI and Internet are banned. In this way, it will be most helpful transferring medium for us. It includes other benefits like: • *A very wide spectrum over visible wave length range. • * super high colour fidelity.\r\n• *Instant start time.\r\n• *Easy terminal Management.\r\n• *Dynamic dark i.e. brightness transition of lamp output to enhance video contrast. • *Trouble-free desegregation into existing light engine platform. • Li-Fi is the upcoming and on growing technology acting as fitted for diverse other developing and already invented technologies. Since light is d major source for transmission in this technology it is very advantageous and implementable in various fields that can’t be done with the Wi-Fi and other technologies. Hence the future applications of the Li-Fi can be predicted and extended to different platforms like education fields,\r\n aesculapian field, industrial areas and many other fields.\r\nVIII. CONCLUSION\r\nThe possibilities are numerous and can be explored\r\nfurther. If this technology can be put into practical use, every bulb can be used something like a Wi-Fi hotspot to transmit wireless data and we will proceed toward the cleaner, greener, safer and brighter future.\r\nThe concept of Li-Fi is currently attracting a great deal of interest not least because it whitethorn offer a genuine and very good alternative to radio-based wireless. As a growing military issue of people and their many devices access wireless\r\ninternet, the airwaves are becoming increasingly clogged, making it more and more difficult to get a reliable, high-speed signal. This may solve issues such as the shortage of radio-frequency bandwidth and also allow internet where\r\ntraditional radio based wireless is not allowed such as\r\naircraft or hospitals. One of the shortcomings however is that it only work in direct line of sight.\r\nCONCLUDING REMARKS:\r\n• Overcomes the limitations of radio spectrum\r\n• High speed of 10 Gbps can be achieved\r\n• Lifi can solve the foressential problems of wireless communications these days\r\nIX. book of facts\r\n1. http://en.wikipedia.org/wiki/Li-Fi\r\n2. http://gimt.edu.in/clientF iles/FILE_REPO/2012/NOV/23/1353645362045/69.pdf 3. http://www.collegelib.com/t-li-fi-technology-seminar-report-abstract.html 4. the-gadgeteer.com/2011/08/29/Li-Fi-internet-at-the speed- of-light/ 5. http://the-gadgeteer.com/2011/08/29/li-fi-internet-at-the-speed-of-light/\r\n6. http://www.oledcom.com/FR/ bear on%20release%20MWC2013.pdf 7. ill Li-Fi be the new Wi-Fi?, New Scientist, by Jamie Condliffe, dated 28 July 2011. 8. http://www.eiccit.org/Proceedings/LI-FI%20the%20Latest%20Technology%20in%20Wireless.pdf 9. ”Visible-light communication: Tripping the light fantastic: A fast and cheap optical version of Wi-Fi is coming”, Economist, dated 28Jan 2012 10. http://www.digplanet.com/wiki/Li-Fi\r\n'