The light is not a dream to explore the visible light communication LiFi's past life"

In May 2013, Tsinghua University and KingSun signed the LED wireless optical communication project, a new term "LED wireless optical communication" into the public. At that time, the public is unfamiliar with the term, or only know its name do not know the matter. In October of the same year, the Fudan University also heard good news, LED visible light communication technology in the computer science and Technology College Laboratory successfully achieved. The researchers will access a network signal 1W LED chip, under the light of the 4 computer to the Internet, the highest rate of up to 3.25G, the average Internet speeds up to 150M, the world's fastest "lights on the internet". For a time, "Fudan University achieve the lighting on the Internet" news spread like wildfire. Subsequently, the news about the visible light communication technology, such as the tide came, LiFi a fire.

Visible light communication research has opened

Xiao Bian learned that the concept of visible light communication is not only in 2013. In fact, as early as in 2000, Tanaka et al., Keio University, Japan, and the SONY Institute of computer science, Haruyama put forward the use of LED lights as a communication base station for wireless communication of information indoor communication system. In 2002, Tanaka and Komine carried out a detailed analysis of the LED visible light communication system, and in the same year formally proposed a set of power line carrier communication and LED visible light communication data transmission system. Time flies, the researchers never give up the research, finally in the October 2008 Tokyo International Electronics Show, Taiyo Yuden Japan company to the world for the first time display in a communication system, white LED at that time, the maximum transmission distance is only 20cm. Although this distance is very short, but at that time, it is indeed a unique innovation technology!

Research on camera switching to domestic visible light communication. In 2006, Peking University, for the first time proposed a wide angle lens based ultra wide angle of view visible light signal reception scheme, and carried out a series of theoretical and experimental work. 2008, following the Japanese enterprises first public display of white LED communication system, Jinan University professor Chen Changying developed the first white LED visible light communication prototype, transmission distance greater than 2.5 meters. But it was not until 2013, the Fudan University to achieve LED light Internet message crazy pass network, LED visible light communication is truly present in front of the Chinese people.

After Japan, China, European countries have also been visible light communication. In 2009, the University of Oxford Brien et al use equalization technology to achieve the communication rate of 100 Mbit/s; the following year, they displayed indoor visible light communication system demo, using 16 white LED communication, the real-time broadcasting 4 Hd video. By 2010, the German Fraunhofer Henrich Hertz Institute laboratory researchers will be able to raise the communication rate to 513 Mbit/s, creating a record of the world's visible optical communication rate. At that time, the visible light communication is not called LiFi, but VLC (Visible Light Communication). Until 2011, the University of Edinburgh professor Haas Harald demonstrated with signal processing technology of LED lighting to HD video to the computer, and the visible light communication named LiFi (Light Fidelity). October 2013, researchers from several universities in the United Kingdom will be LiFi refresh rate up to 10Gb/s.

LiFi video playback image source: PureLiFi

Visible light communication technology is commercialized

LED visible light communication is not a "pet" in the laboratory, it has gradually realized commercialization. In October 2013, Professor Haas founded the PureLiFi (formerly known as PureVLC) to the United States a medical organization to sell the first set of LiFi equipment, worth 5000 euros (about RMB 41 thousand). The deal marks the formal recognition of the commercial value of LiFi.

China, November 2013, KingSun in cooperation with Tsinghua University has successfully developed a LiFi version of mobile phone communication samples, and is expected to reach iPhone size and thin degree of market.

Recently, during this year's International Consumer Electronics Show (CES), the French OLEDcomm company demonstrated the realization of optical communication technology of mobile devices. Technology and staff will be converted into a smart phone front camera light sensor, allowing viewers to witness the LiFi optical communication technology, the transmission rate of about 10Mpbs. The company said that next year will be visible light communication industry.

With the rapid development of visible light communication, domestic investment, promotion of a start. In September 2013, Zhuhai Huace Group invested 2 billion yuan of white light LED communication; December 2013, Chongqing became the application of visible technology pilot city; the State Key Laboratory of mobile communication experts in Jiangning Development Zone China wireless Valley said, visible light communication technology equipment in the industry next year is expected to Jiangning development zone. Manufacturers generous investment, the government's strong support for the visible light communication prospects can be expected.

Wide range of applications in visible light communication

Although we are familiar with the term "visible light communication", it is not always known to its application. LEDinside small must interpret for you, the four major application areas: 1) lighting and communication, information can be broadcast in the indoor environment, and meet the lighting requirements at the same time; 2) visual signal and data transmission, signal lamp mainly through the color change to provide signals and data communication with the combination of signal lights can provide better security and reliability for traffic management; 3) display and data communication, LED display is usually used to display information, if the corresponding