Li-Fi Technology Essay

I. IntroductionLi-Fi or clear(p) Fidelity is a engine room that employs sw all(prenominal)ow emitting diodes to air out entropy wirelessly. It was first demonstrated at a TED talk in 2011 by German physicist Harald Haas. This is a forego band that does not need e rattling license. Hence it is cheaper than Wi-FI. Wi-Fi, is a popular technology that allows an electronic device to interchange info or connect to the meshingwirelessly using piano tuner waves the viewable absolved spectrum is larger than the radio spectrum which provides better flexibility in its use. confabulation theory oer a very gamy speed with a conjectural limit of 10 GB per second. The technology is capable of dispatchring thousands of streams of selective information simultaneously, in parallel, at higher speeds, with the help of special modulation, using a singular suggest processing technology. The term Li-Fi was first utilise in this consideration by Harald Haas in his TED Global talk on manifest Light Communication. At the heart of this technology is a new generation of high brightness gentle denotation-emitting diodes, says Harald Haas from the University of Edinburgh, UK, Very simply, if the guide is on, you transmit a digital 1, if its come to you transmit a 0,Haas says, They chiffonier be switched on and come to very quickly, which gives nice opportunities for transmitted info.Fig.1 Harald HaasIt is possible to encode selective information in the light by varying the rate at which the leads illumination on and run into to give various strings of 1s and 0s.The LED vividness is modulated so cursorily that human eye firenot notice, so the production appears constant. With the use of light radiating diodes Li-Fi technology transfers data through wireless. Li-Fi is a new exemplar for photosensitive wireless technology to provide unprecedented connectivity within a localized data centric environment. at that place has been a complete shift in wirele ss technology due to augment demand Li-Fi is much(prenominal) a free band which is license free that is why it is less at cost than Wi-Fi. With the use of special inflection using a distinctive signal processing technology thousands of streams of data bath be transferred simultaneously at higher speed. Li- Fi is useful in aircraft because the lights present above head can be used for data transmission. It is useful in controlling traffic at traffic signals as it communicates with LED lights of cars. Where there is difficult to amateur optic fibers LI-Fi is used. The new Li-Fi technology can be well managed very easily and it is pretty h 1st. At one corner you go out be having a led which provide be workings as a light theme and on the other corner a Light Sensor or a photo detector. Light Sensor detect light as briefly as the LED light starts glowing and exit give an return of eitherbinary1 or binary0.picFig.2 Li-Fi EnvironmentIf the LED is on, you transmit a digital 1, if its off you transmit a 0.What is VLC?Visible light conference (VLC)-A potential solution to the global wireless spectrum shortage Li-Fi (Light Fidelity) is a fast and cheap visual version of Wi-Fi, the technology of which is based on Visible Light Communication (VLC).VLC is a data discourse medium, which uses subgross light between 400 THz (780 nm) and 800 THz (375 nm) as optical carrier for data transmission and illumination. It uses fast pulses of light to transmit cultivation wirelessly.Li-Fi Technology at a GlanceThe LED myelin will hold a micro-chip that will do the job of processing the data. The light intensity can be manipulated to send data by midget changes in amplitude. This technology uses visible spectrum of light, a part of the electromagnetic spectrum that is chill out not greatly 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 crotchety sig nal processing technology. Some Points of Li-FiThe light used to transmit the data is called D-light by Harald Hass, the inventor of Li-Fi. In future data for laptops, Smartphones, and tablets can be transmitted through the light in a room by using Li-Fi. Security would be a snapif you cant see the light, you cant access the data.II. CONSTRUCTIONThe LI-FI product consists of 4 primary sub-assemblies Bulb RF power amplifier circuit (PA) Printed circuit control panel (PCB) EnclosureThe PCB controls the electrical inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions. An RF (radio-frequency) signal is generated by the solid-state PA and is guided into an electric field to the highest degree the bulb. The high concentration of energy in the electric field vaporizes the table of contents of the bulb to a plasma state at the bulbs center this controlled plasma generates an intense source of light. All of these subassemblies ar contained in an aluminum enclosure FUNCTION OF THE BULB-At the heart of LI-FI is the bulb sub-assembly where a sealed bulb is embedded in a nonconductor material. This design is more than reliable than conventional light sources that insert degradable electrodes into the bulb. The dielectric material serves two purposes first as a waveguide for the RF energy 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 full spectrum. The design and construction of the LI-FI light source enable efficiency, long stable life, and full spectrum intensity that is digitally controlled and blue to use. There ar over 14 billion light bulbs worldwide, they on the besideston need to be replaced with LED ones that transmit data.III. HOW LI-FI WORKS?picFig. 3 block diagram of Li-fi communicationIn order to know the working of Li-f i we need to know the necessity for Li-fi .With the vast development in subsisting the use of gadgets and invention of new gadgets is increasing which lead to the technological developments. There are many situations in which mess get frustrated with the boring performance signals of Wi-Fi at a place with many network connections in seminars conferences etc. Li fi fulfils these needs .this fantabulous idea firststriked the hear 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 on then the digital 1 can be transmitted and if the LED is off then the digital 0 can be transmitted. LEDs can be switched on and off very quick. For transmitting data this way all that we require is LEDs and controller that code data into Leds. Parallel data transmission can be through by using tramp of LEDs or by using red, green, blue LEDs to alter light frequency with the frequency of different data channel.Advancements and enhan cements in this field generate a speed of 10 gbps lone(prenominal) if amazingly fast data rates and lowering band widths are not the unaccompanied reasons that enhance this technology. Li-fi usually is based on light and so it can be probably implemented in aircrafts and hospitals that are prone to inference from radio waves .Unlike Wi-Fi, Li-Fi can work even under-water which makes it more opportune for military surgerys. 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.The data transmission is done through binary codes which train switching on LED can be done by logic 1 and switch off using logic 0.The encryption of information in light can therefore be determine by varying the rate at which the LEDs flash on and off to give strings of 0s and 1s.visible light communication is this method of using rapid pulses of li ght to transmit information wirelessly. To further get a grasp of Li-Fi consider an IR remote. It sends a single data stream of bits at the rate of 10,000-20,000 bps. havely replace the IR LED with a Light Box 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 hospitals. So visible light communication not only has the potential to solve the problem of lack of spectrum space, but can also enable novel application. The visible light spectrum is out of work its not regulated, and can be used for communication at very high speeds.IV. COMPARISON BETWEEN LI-FI &WI-FILI-FI is a term of one used to describe visible lightcommunication technology apply to high speed wireless communication. It acquired this name due to the similarity to WI-FI, only using light instead of radio.Li-Fi techno logy is based on LEDs for the transfer of data. The transfer of the data can be with the help of all human body 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.V. ADVANTAGES Capacity Availability Efficiency mellow Security Easy To Use Fast Data Transfer Harmlessness inexpensiveVI. DISADVANTAGESStill there are some backdrops like it can only transmitWhen in the line of sight well it can be sorted Visible-light communication Tripping the light Fantastic A fast and cheap optical version of Wi-Fi is coming, Economist, dated 28Jan 2012 out someday I hope. There has been a lot of early hype, and there are some very good applications.VII. APPLICATIONS1. Education systemsAs with the advancement of cognition the latest technology is the LIFI which isthe fastest speed internet access service. So this will leads to the replacement of wireless local area network a t institutions and at companies so that all the people can make use of LIFI with same speed intend in a particular area.2. Extends our life spanAs operation theatres do not allow WIFI due to radiation concerns. tradition of WI-FI at hospitals interferes with the mobile and pc which blocks the signals for monitoring equipments. Therefore the replacement for this Wi-Fi is Li-Fi as Hass has mentioned in his TED TALK 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 dazzling fixtures in the room.3. decrement in accident numbersAt traffic signals, we can use LIFI in order to communicate with LED lights of the cars by the number of accidents can be reduced. Data can be easily transferred by qualification use of LIFI lamps with the street lamps.4. Replacement for others technologiesThis technology doesnt deal with radio waves, so it can easily be used in the places where Bluetooth, infrared, WIFI and Intern et are banned. In this way, it will be most assistive transferring medium for us. It includes other benefits like *A very wide spectrum over visible wave length range. * Extremely high colour fidelity. * blink start time. *Easy terminal Management. *Dynamic dark i.e. brightness flexion of lamp output to enhance video contrast. *Trouble-free integration into existing light engine platform. Li-Fi is the upcoming and on growing technology acting as competent for various 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 cant 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,medical field, industrial areas and many other fields.VIII. stopping pointThe possibilities are numerous and can be exploredfurther. If this technology can be put in to practical use, every bulb can be used something like a Wi-Fi hotspot totransmit wireless data and we will proceed toward thecleaner, greener, safer and brighter future.The concept of Li-Fi is currently attracting a great deal of avocation not least because it may offer a genuine and very efficient alternative to radio-based wireless. As a growing number of people and their many devices access wirelessinternet, 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 wheretraditional radio based wireless is not allowed such asaircraft or hospitals. One of the shortcomings however is that it only work in direct line of sight.CONCLUDING REMARKS Overcomes the limitations of radio spectrum High speed of 10 Gbps can be achieved Lifi can solve the foressential problems of wireless communications these daysIX. elongation1. http// en.wikipedia.org/wiki/Li-Fi2. http//gimt.edu.in/clientFiles/FILE_REPO/2012/NOV/23/1353645362045/69.pdf 3. http//www.collegelib.com/t-li-fi-technology-seminar-report-abstract.html4. 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/6. http//www.oledcom.com/FR/Press%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