About LiFi what you need to know

Li-Fi (Light Fidelity) is a visible light wireless communication is equivalent to Wi-Fi (VLC) technology, can use the light emitting diode (LED) data transmission light bulb, can provide lighting and wireless networking, and will not produce electromagnetic interference, will help ease the current network traffic explosion problem, so the development prospect is good.

Today, the world has been inseparable from the Wi-Fi, it is ubiquitous, neighbors have, each cafe free of charge, smart phones can not do without it. We all know Wi-Fi, but do you know Li-Fi?

With the growing demand for mobile wireless access, blocking mobile network and Wi-Fi will continue to increase, then even if the additional radio frequency resources (Radio Frequency, RF), may not be enough to solve the problem, this phenomenon is called "crisis" (Spectrum Crunch) spectrum. But a more development solution is quietly coming out; according to statistics, more than 70% of mobile traffic are from the indoor environment, Li-Fi by the light emitting diode (LED) illumination area and does not interfere with the supply of complementary bandwidth to solve the spectrum shortage such that its huge data capacity density to reduce the burden on the existing radio network.

Li-Fi is the abbreviation of Light Fidelity, is visible light wireless communication is equivalent to Wi-Fi (Visible Light Communications VLC) technology, invented by the British company pureLiFi chief scientific officer and University of Edinburgh professor Harald Hass. The transmission of data from LED light bulb using this new technology can be epoch-making, while providing for the use of lighting and wireless communication area, wireless network link to provide the overwhelming, so that all the indoor environment or any light department can get online.

Visible light communication refers to any visible light transmission of data communications, mainly dependent on white light, the concept of Red (Infra), which is currently used in remote control communication.

In addition to data communications, Li-Fi also brings advanced network capabilities, including Over (Data), Roaming (Hand) and multiple access.

Li-Fi development background

Alexander Bel's most known identity was the inventor of the telephone, but he was also the first person to show the optical communication system in 1880. In fact, just four years after the invention of the telephone, Baer dialed the world's first wireless phone. This phone is a Photophone device that uses light instead of radio. But Baer needs to use sunlight to transmit, so the scope of use is quite limited.

Professor Haas Harald and his research team at the University of Edinburgh pioneered the development of the concept of Li-Fi, the research laboratory is located in the Alexander Bel building (even Baer was born in Edinburgh, and the University of Edinburgh alumni). The emergence of Li-Fi, is expected to solve the problem of spectrum is congestion. Professor Harald Haas at the July 2011 TED global conference, the use of live streaming video show Li-Fi technology for the first time. PureVLC company was founded in 2012, specializing in commercial Li-Fi.

Li-Fi calls for a more evolved solution

Like Wi-Fi, Li-Fi enables computers, pen and smart phones and other electronic devices to connect to a wireless network. Although Wi-Fi was initially developed only for these devices, it has now been widely used to connect things in life: printers, TVs, speakers, headphones, and even sports shoes! In simple terms, the role of Li-Fi is equivalent to Wi-Fi, only the use of light as a medium, rather than a wireless signal.

LED bulbs because of electricity, high security, is rapidly replacing the traditional fluorescent lamp, and Li-Fi is the use of light from the LED bulb to transmit data, it can also provide lighting and wireless data transmission.

Imagine using Li-Fi technology LED bulbs installed in your living room, office, or even your desk and bedside lights. The use of the Li-Fi LED bulbs lit place, can also enjoy the convenience of communication brought by Li-Fi.

The difference between Li-Fi and Wi-Fi

Li-Fi can be turned into a similar Wi-Fi desktop LED wireless access point. In addition to providing the advantages of lighting, what are their different functions?

Solve the clogging problem

The use of Wi-Fi development is quite limited Frequency (Radio) technology, such as computers, pens, printers, smart TVs, mobile phones and tablet devices must compete for bandwidth. With the device of refrigerator, watches, cameras and other more can use Wi-Fi launched from a mobile network data distribution plus, traffic congestion is becoming more and more serious, the quality of information transmission is affected by the following. Li-Fi the frequency of the use of light waves, the bandwidth is more than ten thousand times the radio frequency bandwidth, and does not conflict with Wi-Fi.

Safety

As we all know, Wi-Fi will produce electromagnetic interference (Electromagnetic Interference, EMI), the impact of aircraft equipment and medical equipment, and for power generation, or oil and gas drilling and production of potential hazards. Li-Fi uses light instead of radio waves, which is safe and does not produce electromagnetic interference.

data protection

Radio waves can penetrate the walls and ceilings, but the light is not capable of separating the Wi-Fi and Li-Fi in data protection. Outside the building hackers or intruders can sneak into the indoor computer transmission through Wi-Fi. However, the information transmitted through the Li-Fi can only be accessed within the range of LED lights.

speed

802.11a/g standard Wi-Fi delivers up to 54Mbps data communication speed,