Wi-Fi on the ceiling: this is not science fiction, but should become a reality this year. Under laboratory conditions at the Fraunhofer Institute the data transmission via LED lamps is already excellent, with mega-fast transfer rates of up to 800mbits/s.
Reason enough, us the technology even closer to look at and understand how the whole thing works. An explanation essay.
Wireless data transmission through light: how BB´s works
The Visible Light Communication (VLC) is based on spatial modulation as well as one at the Fraunhofer Institute developed technology called (SIM) OFDM. Fundamentally you can imagine as the principle of data transmission via light as the data transmission from the remote to the TV. Instead of the remote, however conventional LED modules serve as transmitter and instead of a single slow, thousands data streams are transmitted in VLC simultaneously in parallel and with even greater speed. Also at dealledlights, you can check more introduction about led light.
The LED lamp receives the data first via a normal Data transfer interface such as the USB port or Ethernet. To transfer this data now on more devices, the light of the LED lamp is in the kHz to GHz range easily modulated or on and off. As a result, the data converted into optical signals. For our eyes, which is imperceptible. We see only ordinary light. Depending on the transmission speed, now redirected the light signals or extract their information, and sends the data in the transfer standard to the recipient.
A photo diode acts as a receiver for notebooks. It transforms the movements of light into an electrical signal that eventually will be converted back into a high-speed stream of ones and zeros, which can then as usual read the device and process. This principle works in both directions.
The video explains the physicist Harald Haas, who explored the wireless data transmission via LED at the University of Edinburgh, how the technology works:
Data transfer: Why LED lamps?
VLC works in fact with all Commercially available LED modules. Because they hardly reach necessary transfer speeds, only LED retrofits thereof are excluded. And why just LED? A light-emitting diodes are electronic components, on the other hand their intensity you can modulate or can they very quickly and be turned off. It’s so fundamental properties, which exploits the innovative technology. In addition, that LED are extremely energy-efficient and consume very little power. Because there are lamps already at any place, which is using the new technology data transfer free.
There are also more wave lengths than at the radio transmission in optical wireless. This means for us users, the transmission speed is safe in the future, even if more people are accessing the network simultaneously.Lame Internet ade.
And what happens if you want times no light? This is admittedly a small hook, because the light transmission of course only works with light. However, there is the possibility to switch to Infrared LED . It used bi-directional data transfer for the return channel, to avoid signal interference. Their light is invisible to humans.
VLC promises safer, faster connections and less interference
The new data transfer technology offers many advantages. Besides more wavelengths and a faster data transfer rate is also a reduced susceptibility to interference. Because the receivers detect only optical signals. A visible demarcation of lamps prevents data chaos even when sending different content on different lamps and also the parallel operation of optical wireless is easily doable. As “Privacy” is already ultra thin rice paper.
And what about other, perhaps even “normal” lamps? You will not interfere, because the receiver responds only to amplitude changes and pays no attention to constant LED light sources.
The developer in terms of data security see another advantage over current means of transmission. Since light comes not through walls and to transfer large volumes of data already must be “Visual contact” between LED lamp and device, the data will remain safe in the building and outside can not be intercepted.
In the future, optical wireless could even help avoid accidents. If brake and front lights “communicate” they could send a signal to the computer in about an impending emergency and initiate an automatic emergency braking to prevent so worse.
What do you think about this new kind of data transfer, see what are the opportunities and risks? Leave us your comment.