It looks beautiful. Fudan to achieve light internet speed 150M replace WiFi?
Source: Internet
Author: User
KeywordsWiFi light Internet
Guide: No wifi signal, point an LED lights can surf the internet. Yesterday, the Fudan University researcher will connect the network signal to a 1W LED light bead, 4 pcs under the Lamplight can surf the internet, the highest speed can reach 3.25G, the average internet speed reaches 150M. Replace WiFi? It looks beautiful. If the lights are blocked, the network signals will be cut off. Black Horse brought you to see a. Find inspiration, dig dark Horse, comment hot, here is Dark Horse news agency: No need wifi signal, point an LED lights can surf the internet. Yesterday, Fudan University School of Computer Science and technology, a good news, a use of the visible light transmission network signals in the international forefront of communication technology in the laboratory successfully achieved. Researchers will connect the network signal to a 1W LED light bead, 4 pcs under the light can surf the internet, the highest speed can reach 3.25G, the average speed of the internet reached 150M, the world's fastest "light Internet." Next month, 10 prototypes will be unveiled at the 2013 Shanghai Public Expo. Visible light communication is known as LiFi has been painting a shiny light bulb on one's head, was used to symbolize the brilliance of an inventor, but German physicist Harald Hass was "lighted" by the light bulb itself: reliance on a small lamp, the invisible network signal, into "visible" Network signal. Haas and his team at the University of Edinburgh recently invented a patented technology that uses flashing lights to transmit digital information, a process known as visible light (VLC), which is often affectionately referred to as "LiFi", To show that it can revolutionize the wireless network transmission technology currently represented by WiFi. How far is this incredible network technology from us? The answer is: very near, it is coming to us step by step from the Fudan University laboratory. Shi Shangyang, a professor at Fudan University's School of Computer Science and technology, told reporters that the current radio signal transmission equipment has many limitations, they are rare, expensive, but inefficient, such as mobile phones, the global millions of base stations to help enhance the signal, but most of the energy consumption is cooling, efficiency is only 5%. In contrast, the world's use of light bulbs is inexhaustible, especially in the domestic led light source is a large-scale replacement of traditional incandescent lamps. As long as a microchip is added to any obscure led bulb, the bulb can be turned into a wireless network transmitter. Visible light communication security and the economy started last year, the Shanghai Science and Technology Commission has made important progress in the research and application of the key technology of visible light communication, which is based on the layout of universities and scientific research institutes in the city, and has achieved significant advances: Researchers not only use visible light to transmit network signals in laboratory environments, but also achieve " One dragged four ", that is, light a small light, 4 computers can be at the same time on the Internet, Mutual transmission network signals. Professor Shangan, a researcher, points out that, like radio waves, light is a kind of electromagnetic wave, the basic principle of transmission network signal is consistent. In the study, the ordinary LED light bulb on the microchip, you can control it millions of times per second flashing, light up the table1, off the representative 0. Because the frequency is too fast, the human eye simply does not perceive, the photosensitive sensor can receive these changes. In this way, binary data is quickly coded into light signals and transmitted efficiently. The computer under the light, through a set of special reception device, read the light of the "Morse code." "Where there is a light, there is a network signal. Turn off the lights. Shangan told reporters that, compared with the existing WiFi, the future of visible light communication is safe and economical. WiFi depends on the invisible radio wave transmission, equipment power is increasing, local electromagnetic radiation is bound to enhance the wireless signal through the wall, the network information is not safe. These security hidden dangers, in the visible light communication "away". Moreover, the spectrum is 10,000 times times larger than the radio spectrum, meaning greater bandwidth and higher speeds, and the network settings hardly require any new infrastructure. LiFi Technology also has its limitations of course, as a new network technology and products still in the laboratory, its future potential should not be overestimated. "Because, from the lighting communication control to chip design and manufacture of a series of key technology products, are researchers ' hands-on ', to really like WiFi into tens of thousands of households, need to pass a series of industrial development, there is a long way to go." Shangan that the LiFi technology itself has its limitations, such as if the lights are blocked, the network signals will be cut off and so on. So it's not a WiFi competitor, it's a mutual complement that helps to free up the spectrum space. Its future, whether the use of killer-style applications, but also rely on people's unlimited imagination: car rely on LED lights to "dialogue", the aircraft cabin passengers use the overhead led reading lights to the internet ...
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