LED lighting effects so great future WiFi or replaced

Pacific computer network news, since Edison invented incandescent light bulbs to have been in service for more than a century, but with the LED light is coming, it There is not much left. days. The LED lamp power consumption is only 1/10 of incandescent lamp, and the use of life is 30 times the. Not only that, the use of LED lamps and lighting intelligent lighting is not limited to, with the invention, it is given the additional function, it can make your laptop computer, intelligent mobile phone connected to the internet. Aside from Wi-Fi, Li-Fi.

In fact, with the visible light for wireless communications is not a new idea. Everyone knows that on a desert island can be used smoke signals to attract attention; perhaps in the Napoleon era, few people know that Europe has been covering the optical telegraph, otherwise it would not call lights.

And by a wisp of smoke in the Morse code the way to partition, can form a distress message, visible light communication LI-Fi rapidly by adjusting the light intensity to the data compiled into binary 0 and 1. For example, LED said 1, Guan said 0, the transmission of information through the switch can be fast. But this does not mean that the Li-Fi transceiver will flicker, because the adjustment speeds of more than the human eye recognition speed.

Wi-Fi vs Li-Fi

With the use of WiFi WiFi the number of huge growth, a large number of data transmission to bring enormous pressure from the existing radio and microwave frequency spectrum of WiFI technology. With the mobile device to the exponential growth in 2019 is expected to more than 10 billion devices, will exchange around 922 Beijing 3372 trillion trillion 368 54 million 775 thousand and 808 (18 10) bytes of information. Because the frequency of congestion and electromagnetic interference, the current WiFi technology will not achieve the transmission of this data. The most prominent problem is the city area in the city, because most users WiFi.

The basic principle of communication is for data transmission in the largest bandwidth available on electromagnetic. Radio spectrum is a lot of use and management, but there is no enough extra space to meet user demand growth. So Li-Hi could replace the radio and microwave frequencies Wi-Fi.

For communication, the visible spectrum has the characteristics of huge, and has not yet been used without supervision. LED light can be modulated very rapidly: the use of a single blue LED, data rate is up to 3.5 Gb/s. White light can be reached 1.7Gb/s.

The transmitter is different from that of Wi-Fi, optical communication is carried out in a closed room. This restriction seems to be the limitations of Li-Fi, but it is very safe key advantage: after the curtain outside the room, no one can listen to. The light source array on the ceiling of the signal can be transmitted to the different users different. The transmitter power can be localized, can be used more effectively, and will not affect the adjacent Li-Fi source. Compared with Wi-Fi no radio frequency interference is indeed a great advantage. Visible light communication is safe, and can make the traveler will his equipment switched to flight mode.

Li-Fi further benefit is that it can use the existing power line, such as LED lighting, so there is no need to build new infrastructure.

Help things burden

In the highly interconnected and everything with the object of autonomous communication in the world, the Internet of things is a bold idea. For example, your refrigerator in the milk, or quickly expired information will be sent to your mobile phone to inform you. The automobile sensor excessive wear in the tire, the tire pressure is too low or when the mobile phone to inform you.

Because the things of the goods, to connect to the network to the sensor and controller, so the equipment required for communication bandwidth is huge. According to forecasts, by 2020 there will be 25 billion devices are connected, in fact, these things are only need to be connected by a short distance, so Li-Fi will become a realistic solution.

Some companies have started to provide visible light communication products. Headquartered in Edinburgh, PureLii Li-1st, wireless 11.5Mbps capacity to provide security with internet point -- the equivalent of the first generation Wi-Fi plug and play solution. The other is from the French Oledcomm, connected by Li-Fi and hospital.

Although there are still many technical challenges, but now it has taken the first step to achieve Li-Fi. Sure, you can open the lamp switch in the future more things and not just lighting.

LED more information, please click on the Chinese LED network or WeChat public account (cnledw2013).