Pilot Installation of a Li Fi system by Fraunhofer HHI at a vocational school in Main-Kinzig-Kreis
Fraunhofer HHI
The Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, HHI, also known as Fraunhofer HHI or Fraunhofer Heinrich Hertz Institute, is an organisation of the Fraunhofer Society based in Berlin. The institute engages in applied research and development in the fields of physics, electrical engineering and computer sciences.
The Fraunhofer HHI team deployed the LiFi system in a classroom at a vocational school in the State of Hesse to test the technology in a real-life application scenario. In this process, user experience will be analysed and reviewed to further improve the system. The Main-Kinzig district wants to take on a pioneering role in the evaluation of LiFi and research about the practical advantages of the new technology compared with conventional wireless solutions. They also want to play an active role in advancing the digitisation of schools.
LiFi can enable fast data transmission and communication with peak data rates of up to 1Gbit/s. The LiFi modules come with an USB interface and are therefore compatible with common end-user devices. "This project is an important milestone for us to demonstrate the great potential of this unique technology for mobile communication,” said Dr.-Ing. Dominic Schulz, project manager at Fraunhofer HHI. “It will also help us to further increase the degree of technological maturity."
Image credit to Fraunhofer HHI. Li Fi device by Fraunhofer HHI
What is Li-Fi?
Li-Fi, also known as "Light Fidelity" is a wireless optical networking technology, which uses light-emitting diodes (LEDs) to transmit data. In 2011, professor Harald Haas made a Li-Fi demonstration at the TED (Technology, Entertainment, Design) Global Talk on Visible Light Communication (VLC):
VLC uses light as a medium to deliver high-speed communication like Wi-Fi and complies with the IEEE standard IEEE 802.15.7. The IEEE 802.15.7 is a high-speed, bidirectional, and fully networked wireless communication technology-based standard similar to Wi-Fi's IEEE 802.11.
How does Li-Fi work?
Li-Fi is a high speed, bidirectional, and fully networked wireless communication of data using light. Li-Fi constitutes of several light bulbs that form a wireless network.
When an electrical current goes through to a LED light bulb, a stream of light (photons) emits from the lamp. LED bulbs are semiconductor devices, which means that the brightness of the light flowing through them can change at extremely high speeds. The signal is sent by modulating the light at different rates. The signal can then be received by a detector which interprets the changes in light intensity (the signal) as data. Also when the LED is ON, you transmit a digital 1, and when it is OFF, you transmit a 0.
Li-Fi Benefits
The primary benefits of Li Fi are as follows:
• Security: Provides entirely secure access. Where there is no light there is no data.
• Safety: Does not produce electromagnetic radiation and does not interfere with existing electronic systems.
• Localisation: Allows localisation due to small coverage area of Li-Fi access point - localisation can be used for very precise asset tracking.
• Data density: Provides ubiquitous high-speed wireless access that offers substantially greater data density (data rate per unit area) than RF through high bandwidth reuse.
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