THE LIFI OR VLC
LiFi or VLC is a wireless communication technology based on the use of visible light between the blue color (450nm) and the red color (760nm), generated by LEDs. Unlike WiFi, which uses the radio part of the electromagnetic spectrum, LiFi uses the optical spectrum. The LiFi protocol layers are governed by the international standard IEEE 802.15.7 established since 2011 by the IEEE committee.
In addition to data transmission, this technology makes it possible to use LED lighting sources as a positioning beacon: combined with the gyroscopic sensors present in smartphones and tablets, it makes it possible to predict the movements between the two beacons. and give the user a very precise position. Phones can communicate with smart LEDs inside buildings when GPS technology is not available, following the movements between two "beacons". This location can also be used to provide additional personalized services or information to customers and infrastructure managers.
Geodocumentation can be used to deliver the right content at the right time:
- - Information
- – Game
- - User Manual
- - Security rules
Lifelike technology can be used in places such as hospitals where room lamps transmit the patient's medical data to the nurse's trolley. Others may be in museums where media content is displayed on tablets equipped with GEOLiFi, a new digital audio guide. Similarly in supermarkets where the shopping cart can be equipped with a tablet broadcasting micro-localized marketing messages by department. The data collected by these tablets also makes it possible to map customer flows in stores with cold or hot areas.
LIFI IS NOW INTEGRATED IN THE SMARTPHONE.
It is now possible to use the front and back cameras of Apple and Android smartphones to receive the information transmitted by the LED.
Low-speed data is generated locally at the LED luminaire (from sensors, self-diagnostics, etc.) and allows data dissemination and fast matching uses.
Each luminaire emits its operating temperature, its utilization rate and maintenance alerts.
Les informations de maintenance sont collectées et analysées pour optimisation.
LED lighting transmits its local address, a security password for instant matching.
The cars can communicate with the different tools of the road (other car, lights) to prevent an emergency braking, accident, danger zone ...
Light can, for example, become an additional key for your secure transactions.
The high debit
The high-speed LIFI: major advantages that will enable this technology to prevail The high-speed LIFI opens new horizons in terms of Internet connection and offers: - An alternative to radio waves, potentially harmful to health Light waves are harmless to the human body, even beneficial to certain frequencies. The LIFI thus presents an alternative to radio waves, which is particularly important in environments sensitive to WIFI such as hospitals, medical centers, schools, some industrial structures ... - A solution to confidentiality problems While the WIFI crosses walls and ceilings, LIFI information is only permissible in the "cone" of light. It remains confined in the desired space and completely secure, while allowing mobility. There is therefore no risk of remote hacking of data via the LIFI. This system is therefore particularly interesting for sectors whose data are highly confidential (R & D, Defense, banks, security, etc.). - A solution to the problem of saturation of the WIFI band The visible band is 10,000 times wider than the WIFI band, which allows to maintain an optimal level of coverage despite a large number of users. - A solution to the problems of limited flows The theoretical modulation limit of an LED is 1GB / s, which is 10 times more than the WIFI. LIFI is also economical and environmentally friendly since it does not increase the energy consumption of the building that is equipped with it.