LIFI – LiFire ou VLC internet par lampe LED – révolution ou utopie ? LIFI, LiFire ou VLC où comment se connecter sans fil au net via les lampes LED avec effet wow garanti … mais pour des usages limités actuellement au broadcast. Gadget où technologie d’avenir ? Des chercheurs estiment l’horizon commercial à 2018. Après la présentation du 1er smartphone Lifi au CES de Las Vegas en janvier 2014, cette technologie poursuit son développement. Certains experts ou industriels annoncent 14 milliards de LED LIFI d’ici 2020 (cf article des echos décembre 2015). Le chiffre d’affaires potentiel du Li-Fi est estimé à 6 milliards de dollars en 2018 (cabinet d’études américain Markets and Markets).
High-Speed Internet from the Ceiling Lamp - Fraunhofer HHI The technology developed by HHI makes it possible to use standard off-the-shelf LED room lights for data transmission. Data rates of up to 800 Mbit/s were reached by this optical WLAN under laboratory conditions, while a complete real-time system exhibited at trade fairs reached data throughput of 500 Mbit/s. The newly developed patent protected components have now achieved a transmission rate in laboratory experiments of over 1 Gbit/s per single light frequency. As off-the-shelf LEDs mainly use three light frequencies or light colors, speeds of up to 3 Gbit/s are feasible.
Li-Fi Li-1st, the first Li-Fi equipment Li-Fi, as coined by Prof. Harald Haas during his TED Global talk, is bidirectional, high speed and fully networked wireless communications, like Wi-Fi, using light. Orthogonal frequency-division multiplexing Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, whether wireless or over copper wires, used in applications such as digital television and audio broadcasting, DSL Internet access, wireless networks, powerline networks, and 4G mobile communications. Example of applications The following list is a summary of existing OFDM based standards and products. For further details, see the Usage section at the end of the article. Cable
'Li-fi' via LED light bulb data speed breakthrough 28 October 2013Last updated at 09:10 ET By Matthew Wall Technology reporter, BBC News Micro-LEDs can transmit large amounts of digital data in parallel UK researchers say they have achieved data transmission speeds of 10Gbit/s via "li-fi" - wireless internet connectivity using light. Professor Harald Haas A light-based wireless communication network developed by Edinburgh-based mobile communication specialist pureLiFi could become an essential tool for Government and business in combating terrorism and cyber crime. The pureLiFi system offers a new and secure way of exchanging information over networks, using light rather than radio waves to communicate between devices. The pureLiFi system offers a new and secure way of exchanging information over networks, using light rather than radio waves to communicate between devices The new light-based communication technology, known as Li-Fi, could provide a substantially increased solution to enhance data security for businesses seeking to improve data protection – from Government and defence organisations through to financial, public sector, pharmaceutical or any ‘high data risk’ industries.
Visible Light Communications One only needs to read some of the daft comments posted at the foot of online visible light comms articles to understand that there are a large number of misconceptions out there. Here is my Li-Fi myth buster top 10. 1. Project Li-Fi Eric Packman, August 10, 2013 #hwdesigncontest #buildsomething My project was an attempt to replace my old nemesis, wifi, with an alternative that's safe, secure, fast and not prohibited by the CRTC. It occurred to me that if, for example, an LED driving multimode fiber optics can attain multi-gigabit speeds, why can't LED lighting in the house also communicate information, at least fast enough for home tasks? Turns out, it can. Li-Fi Solves all of Wi-Fi’s Flaws September 6, 2011 at 8:26 pm pltimme In our world today we hear the buzz words interconnected and wireless communications quite frequently, but as we continue to exchange vast amounts of data between various devices the entire system which we currently use is almost doomed to collapse at some point. In a recent episode of one of my favorite new age idea/technology websites, TED Talks, Harold Haas revealed an ultra sophisticated way to transmit data. In order to understand the true advantages the new data transmission technology provides, we must first understand the flaws of our current data communication practices.
Can LEDs help to solve the looming spectrum congestion problem? 11 February 2014 A host of research projects in the established field of visual light communications (VLC) is pushing towards the possibility of using the lighting infrastructure to transmit data at several Gbit/s, with perhaps the most promising approach – dubbed Li-Fi (for light fidelity), a subset of VLC – making waves in several ways. The moniker's similarity to its rf equivalent, Wi-Fi, is no accident: proponents of Li-Fi are suggesting it could become as ubiquitous as IEEE802.11. But, to be fair, even the most ardent evangelists accept that it will take quite a while for the technology to mature.
10 Gbps Li-Fi system shows wireless data transfer in a new light Light might be the preferred option for transmitting data over long distances via cables, but when it comes to short range wireless, radio waves rule in the form of Wi-Fi and Bluetooth. Now Mexican company Sisoft, working with researchers from the Autonomous Technological Institute of Mexico (ITAM), has developed a wireless technology that transmits data in visible light emitted from LED lamps, while lighting the room at the same time. Called Li-Fi, which is short for light fidelity, the technology is what is known as Visible Light Communication (VLC). Unlike infrared-based systems, VLC involves transmitting data using light visible to the human eye. Forget WiFi, Connect to the Internet Through Lightbulbs - Technology - GOOD Whether you’re using wireless internet in a coffee shop, stealing it from the guy next door, or competing for bandwidth at a conference, you’ve probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people—and their many devices—access wireless internet, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. But radio waves are just one part of the spectrum that can carry our data. What if we could use other waves to surf the internet? One German physicist, Harald Haas, has come up with a solution he calls “data through illumination”—taking the fiber out of fiber optics by sending data through an LED lightbulb that varies in intensity faster than the human eye can follow. It’s the same idea behind infrared remote controls, but far more powerful.