No need for WiFi, point LED lights can access the Internet

No WiFi signal, the point of a LED lamp will be able to access the internet. Yesterday, the school of computer science and technology, Fudan University, came to the good news, an indoor visible light transmission network of international cutting-edge communications technology in the laboratory to achieve success. 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". Next month, the 10 prototype will be unveiled in 2013 Shanghai industrial fair.

Visible light communication is called Lifi

Always draw a light bulb in a person's head, was used to symbolize an inventor of the Epiphany, but the German physicist Harald Haas by the lamp itself "lit" whimsy: on a small lamp, the invisible network signal into a signal visible "network. Haas and his team at the University of Edinburgh in England invented a new patented technology to transmit digital information with flashing lights, this process is called visible light communication (VLC), it is affectionately known as "Lifi", to show it to the wireless network transmission technology represented by WiFi may bring revolutionary change.

How far is it from the Internet that we can't imagine? The answer is: very close, it is from the Fudan University laboratory step by step to us. School of computer science and technology Fudan University professor Xue Xiangyang told reporters that the current wireless signal transmission equipment has many limitations, they are rare and expensive, but the efficiency is not high, such as mobile phone base stations, millions of global help enhance the signal, but most of the energy is consumed in the cooling efficiency, only 5%. In contrast, the use of the world's bulbs are inexhaustible, especially in the domestic LED light source is a large scale to replace the traditional incandescent lamp. As long as any small LED bulbs in the addition of a microchip, the bulb can be turned into a wireless network transmitter. (down to A2 version) (First Edition)

Visible light communication security and economy

Last year, the Shanghai Municipal Science and Technology Commission has been in the city's universities and research institutes in the layout of the international advanced wireless communication technology, undertaken by the Fudan University, visible light communication key technology research and application has made significant progress: the researchers used not only in the laboratory environment of visible light transmission network signal, and can realize the "one to four", i.e. light a lamp, 4 computer to the Internet, interpenetrating network signal. Researcher Professor Chen Nan pointed out that the same as light and radio waves, are a kind of electromagnetic wave, the basic principle of network signal transmission is consistent. In the study, the ordinary LED bulbs on the microchip, can control it millions of times per second flashing, lit 1, out of the representative of the 0. Because the frequency is too fast, the human eye can not be detected, but the photosensitive sensor can receive these changes. In this way, the binary data is quickly encoded into a light signal and effective transmission. Under the light of the computer, through a special set of receiving devices, read the lights in the Morse code".

Where there is light, there is a network signal. Turn off the lights. Nan Nan told reporters, compared with the existing WiFi, the future of visible light communication security and economy. WiFi depends on the invisible radio wave transmission, the equipment power is more and more big, the local electromagnetic radiation will be strengthened; the wireless signal passes through the wall, the network information is not safe. These security risks, swept away in the visible light communication "". Moreover, the spectrum is 10000 times larger than the radio spectrum, which means greater bandwidth and higher speed, and the network settings require little 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 chip design to manufacture a series of key technology products, is the researchers' hands-on ', to really come into thousands of households like WiFi, through a series of industrial development, there is a long way to go. Late Nan believes that Lifi technology itself has its limitations, such as if the light is blocked, the network signal will be cut off, etc.. Therefore, it is not a competitor to WiFi, but rather a complement to each other to help release the spectrum space. In the future, the ability to produce a killer type of application, but also rely on people's unlimited imagination: the car to rely on LED lights to dialogue, the aircraft cabin passengers use the head of the LED reading lights to the internet......