As a new network transmission method, LIFI can't replace wifi, because wifi has its characteristics, that is, it can pass through the wall. As long as the signal is popular, it can be ubiquitous on the Internet, but now LIFI is only In the research and development stage, once the transmission between the lights is blocked, the signal is also blocked, so when you go to the Internet, the lights will shine. When you leave or the lights are blocked, there is no signal. This is why the download is half-time. It is quite inconvenient to say, maybe it will be better to install on the ceiling, but it still supports wifi!
In the long run, it is likely to replace wifi in a wide range. the reason:
1. The data transmission of the grid can be combined with lifi to reduce the cost of data transmission and achieve the popularity of lifi (I am currently finding myself the first to think of this idea);
2. Reverse data transmission can be supplemented by other wireless bands;
3. Wireless transmission realized by wireless resonant transmission technology can eliminate environmental interference problems. (The place where the light is isolated can be solved by short-range wireless resonant transmission technology; this idea I found myself is the first to think of);
4. The combination of grid data transmission and lifi can easily solve the problem of lifi transmission distance;
5.lifi's standard has not yet been developed, and its band advantage makes its bandwidth greatly improved, which will far exceed the new wifi standard bandwidth;
6. Energy consumption solution, the switch is set to the third gear: bright light, single data transmission (micro power consumption), off.
Imagine that new technologies bring future developments. People often make a problem, require all-round technology, and have no problem with the details of each technology. In terms of use, it is required to play a role in various application scenarios.
More than a decade ago, e-commerce was a joke. People at that time were well aware of the various drawbacks of e-commerce, the payment field, the circulation field, people's usage habits, and so on. Under the circumstance that no conditions are available, a young man is on the road with the expectations of e-commerce that he can't understand. Now everyone knows the story of Ma Yun.
A technology, do not need to be all-inclusive, it only has one or two extreme strengths, while the shortcomings do not affect the use, and then there are several typical markets that are wide enough to use, which is enough.
The shortcomings of technology will gradually make up for it, and the short-term users will find ways to overcome them, and the application scenarios will let users and the market explore themselves.
The most powerful thing about Lifi is its high bandwidth. No need to go to Gbps, even a few hundred Mbps is enough. Download an ordinary 1, 2 G movie, game, TV series, minutes of things, it is not cool.
Nowadays, many families have already entered the home with fiber, but the problem after entering the home has not been solved. The wifi is too slow, and the fiber-optic home can not reflect the high bandwidth. With Lifi, the family's entertainment life opens up new horizons. Users have high bandwidth and new changes can occur when they are used. 3D images can show more content, stereo interaction is more powerful, virtual scenes are easier to implement, and so on.
Whether it is lifi or wifi, all use electromagnetic waves, but the wavelength is not the same. All are wireless communication, then the characteristics of different wavelengths are compared. So why use the band of visible light?
From the perspective of lifi researchers, the biggest reason, I guess, is that they suddenly realized that semiconductor-based LEDs can achieve extremely high modulation frequencies. Aha, isn't this a ready-made, cheap transmitter? We can't do edge-emitting laser, we can't do VCSEL, but LED is simple. So what is the general trend of the industry?
Since the fiber has been around for many years, what is the transmitter that is compatible with the fiber? It is a semiconductor-based laser. Why use fiber? Because the optical signal travels far away. Why use a laser? Because of a single wavelength, low dispersion, high efficiency. What band is used? Infrared, 1000+ nm wavelength. Why use this band? Because it is determined by the properties of semiconductor materials. Since light itself can be transmitted wirelessly, why use fiber optics as a waveguide? Because the optical signal can be wrapped to shield environmental interference, especially long-distance transmission. Aha, so we use fiber to pass the signal from the hub to the router at home. The speed of the network is flying. and then? Why do routers use radio frequency? Because we want the signal to cover the entire house. Now where does lifi want to cut into this entire flow of information? Where to cut into which part of the existing technology is compared. Obviously, Lifi can't be compared with fiber-optic communication (or, Lifi is only a derivative of fiber, so there is no comparative significance). Then do the terminal and do the router? From my point of view, the biggest selling point of lifi as a terminal is. . . It lies. . . What is it? Highly oriented and safe? The transceiver must be aligned to the signal (just like the infrared transmission on the phone).
So why don't I connect a router directly to my computer without pulling a fiber. If the cost of lifi wireless is that the receiver must be aligned with the transmitter, there is no occlusion, so why not use wired (fiber) directly? Lifi is wireless for wireless. The wired lifi has become an optical fiber and is a mature technology. The wireless lifi can go to the newspaper.
Of course, maybe we can find some very specific application scenarios. However, should we look for a specific application scenario for a technology or do we invent technology for a specific application?
As for long-distance data transmission, car and road information interaction, how to use Lifi in public space, etc., consider the long-term dryness. The bandwidth of users at home is cool, and a wider market will naturally emerge.
VLC communication is not a substitute for traditional mobile communication. Li-Fi can only be used as a supplement to Wifi, and it can replace Wifi at most in certain environments. Light as a transmission medium - the expansion of electromagnetic waves, due to its own characteristics, has some advantages such as high transmission rate, good safety, energy saving and environmental protection, but it also has its limitations due to excessive dependence on LED light source. Under the current circumstances, VLC communication has a promising future in indoors with light sources, or under mines, in cabins, etc., but it also faces switching problems under different light sources (equivalent to different Wifi). After all, visible light communication is only a supplement to traditional communication, and it will not have a subversive effect. After all, we can sneak Wifi at any time, but I am very embarrassed to export, "Hello, borrow a light," especially in the full of natural light. under.......
Visible Light Communication (VLC) was first proposed by Professor Nakagawa of Keio University in Japan in 2004. Previously, people mainly focused on laser and infrared research, and then because of the booming LED industry, the LED itself is Solid-state devices have such a small bandwidth. One day, Professor Nakagawa took the opportunity to think about the idea of ​​using a light bulb to transmit signals. Visible light communication came into being. Professor Nakagawa also published a paper on exploring the combination of power lines and visible light communication in the following two years...
In short, Professor Nakagawa is the founder of VLC.. Not Professor Haas of the United Kingdom. Professor Haas was the name of Li-Fi, which was raised on the ground, many years later. Of course, Haas cannot be denied the contribution of VLC, but many professors don't contribute much less than him, but Haas is really good at promoting the concept of visible light communication. In the early days, scientific technology really needs people to sell hard. First of all, whether this technology is the best or not. Haas is a person who is engaged in optical communication, and of course will support his own camp... first according to some of the answers above. Reverse communication in several ways: Most of the research is now focused on the downlink of visible light communication (VLC).
There are basically three possibilities for the uplink. The first one is visible light. This is really unlikely... The second one is infrared, but the infrared directivity is too strong... I can't always point the phone at the LED bulb . (However, it seems that the Haas in the Li-Fi system is now using the infrared.. Why does the hen have to choose this..). The third is ordinary wireless communication, which uses RF signals to upload signals.
Personally think this is more reliable, after all, today's mobile phone notebooks already have these RF transceivers, but the problem is that the transmitter needs to have a wireless receiver. For environmental disturbances, I don't worry about environmental interference, because no matter whether it is strong sunlight or surrounding incandescent fluorescent lamps, the effect on visible light communication is actually not big, because there is no signal in the fluorescent light of sunlight, which belongs to the DC component, they bring The main impact is the generation of shot noise. In fact, this noise is relatively small, not a big problem, because the signal intensity of indoor visible light communication is indeed quite large, and it is not a problem that these noises are left behind. ... SNR is still a lever... I don’t know where to go higher than RF. Actually, the real interference is the interference between visible light communication equipment, because after all, we can’t have only one LED bulb in the house, the room is generally Not too big, a receiver can receive signals from many LED transmitters, which is fatal. So these transmitters need to work together, one way is to use power lines or Ethernet lines to interconnect. The problem of communication distance, the fastest speed now claims to be 3Gb/s with only one LED, OFDM, the best LED bulbs, all use it, but there is only between the transmitter and the receiver. 10 cm or so.. (Pit it, this is). But even if it is placed at a normal distance (2-3 m).
Personally think that the speed of a few hundred Mbps should be no problem. Now the standard of IEEE 802.15.7 VLC is also out. The technology inside the standard is relatively conservative and can reach tens of Mbps. Now academic researchers are considering OFDM in VLC, but LED as a transmitter, its working range is very small, and the OFDM signal fluctuation range is particularly large..... These are relatively boring Something, let go of it. . Personally think that VLC is no way to replace WiFi, Wi-FI is cheap and convenient to meet everyone's needs, visible light communication can only be used as a spare tire.. But can not deny the cool nature of this technology.
Intel’s people seem to have just said that LiFi is not working. The related research inside Intel is stagnant, but VLC is a communication medium between cars. The prospects are still great, because the future cars will be equipped with cameras. The car lights are all LEDs, LEDs are emitted, the camera is received, and the workshop transmission can be realized. There is a professor in Taiwan who also studies the visible light communication in the workshop, but he specializes in motorcycle rooms. . Because there are many mountain roads in Taiwan, everyone often rides a small motorcycle...
Before the mass adoption, LiFi had several big problems to solve:
Reverse communication: The photodiode from the LED bulb to the mobile phone only solves half of the problem. How to send the signal back from the mobile phone to ensure the communication link is smooth (of course, it can be supplemented by radio communication, but this makes the standard of this technology It becomes very difficult). No one wants their mobile phone to have a big light bulb while watching the video.
Environmental interference: Ambient light sources sometimes work in the same spectral band. If the ambient light source is strong, it is very likely that LiFi will not communicate properly due to poor signal/to-noise ratio (SINR). When you can tolerate too much sunlight, there is no way to communicate properly in the house - yes, the infrared remote control in your hand may fail when the sun is too strong, and LiFi is the same.
Communication distance: Although there are papers in the lab that communicate to achieve 1 Gbps of bandwidth, this is actually difficult to achieve in an installation environment where there is generally no expert guidance. The bandwidth that can be expected should be in the Mbps range.
Competitive technology: And unlike LiFi's claimants, radio communication can't do the benefits of LiFi. In fact, the WiFi Alliance is developing a new standard 802.11ad, which also has a large bandwidth (~7Gbps) at 60GHz. ), short distance (~10m), good confidentiality (can not penetrate the wall) and so on. Personal experience, to know whether a technology is good, not only to listen to the technical advocates, but also to listen to the technical competitors.
Related technology: engaging in visible light communication means that the products to be produced must not only meet the communication standards, but also conform to the technical specifications of visible light. Related products need to have more certification work to do, which may not be completed in one or two years. And how to connect the communication network to each light bulb by wire is not so simple. It is more promising to be combined with power line communication (PLC).
Standardization: At present, 802.15.7 is still in its infancy or even a unified standard. There is still a long way to go before it can form an influential industry, which is not something a company can do. At present, there is still a lack of heavyweight companies in the industry chain.
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