Sihai network: compared with 4G network, the network transmission speed of WiFi is undoubtedly faster. Now you can connect to WiFi everywhere on the street. In fact, there is a technology that is 10 times faster than WiFi. It is called lifi (lightfidelity). When will lifi technology be used? How will it work? Let's have a look.
Wi Fi has had a huge impact on the use of mobile computing, allowing employees to access the company's network anywhere, and coffee shops can also be the office space for independent staff. But Wi Fi also has its disadvantages, so a new standard is born: Li fi, if it can be successfully launched, it will be able to fill the gap of Wi Fi technology.
The problem with Wi Fi is that the signal coverage is small, especially in the face of walls, and it is easy to be hijacked by hackers. Although bandwidth has increased in recent years, it is very easy to slow down when too many people access Wi Fi at the same time. Adding more Wi Fi is at best a partial solution. It can't solve the security problem, it can only partially solve the scalability problem.
Li fi, also known as visible light wireless communication, is a new wireless protocol, which uses visible spectrum to provide wireless network access. Li fi transmitters use LED lights to adjust the light intensity, mostly beyond the range of our eyes, and are read as data by the photosensitive receiver. Because LEDs already use chips to control their output, they can modulate up to millions of times per second, theoretically transmitting data 100 times faster than Wi Fi.
How Li fi works
The key difference between conventional LED lights and Li fi enabled bulbs is that the driver circuit in the Li fi bulb sends and receives wireless signals, and uses different intensities of light to encode data. Some lights can be connected to the network by connecting a CAT5 cable, while others can receive data through a power cord connection.
Li fi creates a two-way link, using special photodetectors at both ends: one in the room's LED lights, the other on a mobile device or a wireless transmitter plugged into the mobile device. The wireless transmitter sends the data back to the LED. When you move in a room with multiple Li fi lights, the device automatically detects where the strongest signal comes from and shifts to that light source, so the signal is always connected and optimal.
The concept of Li fi was first proposed by Harold middot Haas, a professor at the University of Edinburgh, in 2011. It uses various visible light sources as signal emission sources, and controls the on-off of the light through the controller, so as to control the communication between the light source and the terminal receiver.
Compared with the most commonly used Wi Fi technology, it has the advantages of high speed and wide spectrum. Its operation principle is similar to Morse code. It transmits data through visible light (VLC) and binary code. Because of its fast transmission speed, it is difficult to detect hellip & hellip by naked eyes;
Harald burchardt also said: 'as this technology matures, the ideal situation is to reduce the size of this product, build it into an integrated circuit module, and then use it on smartphones, tablets, laptops, wearable devices and other types of electronic devices. '
However, Harald burchardt finally admitted that although the technology will be promising, it will take 10 to 15 years to appear on every LED lamp or electronic device by then, and pureli FI Company has to achieve this goal in a short time.