Optical Wireless Transmission – LiFi in a smart infrastructure

How can the infrastructure of the future work to make traffic smarter and more efficient?

This video shows how we can connect vehicles and infrastructure through 5G and LiFi technology to make traffic smarter and transportation safer and more efficient.

LiFi (optical wireless transmission, light fidelity) enables mobile communication with light. LiFi is used as a complement to radio, where higher user density requires more capacity. Moreover, LiFi fulfills special safety and electromagnetic compatibility requirements.

LiFi is based on commercially available high-performance LEDs, which are also used for lighting, and large-area photodiodes. Technology and costs are similar to those in radio: orthogonal frequency division multiplexing (OFDM) and adaptive transmission are used as well as multiple-input multiple-output (MIMO), relay function and handover between adjecent access points.

The Fraunhofer HHI has developed LiFi from its basics, is contributing to standardization and supports its transfer into applications. Pilot projects are currently taking place with end users in real operating environments.

Further Information:

vlc@hhi.fraunhofer.de

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Wie muss die Infrastruktur der Zukunft aussehen, um das Verkehrswesen intelligenter und effizienter zu machen?

Dieses Video zeigt, wie wir Fahrzeuge und Infrastruktur durch 5G- und LiFi-Technologie verbinden können, um den Verkehr intelligenter und den Transport sicherer und effizienter zu machen.

LiFi (optical wireless transmission, light fidelity) ermöglicht mobile Kommunikation mit Licht. LiFi wird als Ergänzung zum Funk eingesetzt, wo eine höhere Nutzerdichte mehr Kapazität erfordert. Darüber hinaus erfüllt LiFi besondere Anforderungen an Sicherheit und elektromagnetische Verträglichkeit.

LiFi basiert auf kommerziell erhältlichen Hochleistungs-LEDs, die auch zur Beleuchtung eingesetzt werden, und großflächigen Fotodioden. Technologie und Kosten sind ähnlich wie beim Funk: Orthogonal Frequency Division Multiplexing (OFDM) und adaptive Übertragung werden ebenso eingesetzt wie Multiple-Input Multiple-Output (MIMO), Relaisfunktion und Handover zwischen benachbarten Access Points.

Das Fraunhofer HHI hat LiFi aus seinen Grundlagen heraus entwickelt, trägt zur Standardisierung bei und unterstützt die Umsetzung in Anwendungen. Derzeit finden Pilotprojekte mit Endanwendern in realen Betriebsumgebungen statt.

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Modern navigation systems or traffic information services

have been communicating wirelessly with cars and drivers for years.

In some situations, however, wireless capacity reaches its limits.

Here, an optical solution – Visible Light Communication or Li-Fi for short –

offers a modern and powerful complement.

With the help of a modulator developed by Fraunhofer Heinrich Hertz Institute,

LED lamps are switched on and off very quickly

and data is sent to the receiver as ones and zeros

– invisible to the human eye.

Transmission via LEDs offers many advantages.

LEDs are already widely used, energy-efficient and cost-effective due to the energy savings.

A photodiode on the receiver device captures the light

and converts the information into electrical impulses.

This enables bidirectional data transmission.

In the future smart city,

there will be numerous potential applications for data transmission with light.

Li-Fi enables a real time exchange of a wide range of information

between road users and the local infrastructure.

Traffic-relevant data, such as map updates and multimedia data

can also be exchanged with the data cloud.

In a tunnel, wireless connections are susceptible to interference.

Li-Fi offers the possibility to transmit data optically

via tunnel illumination or from car to car.

This allows information to be streamed live and avoids data congestion on the wireless system.

Local events also need local solutions

and should not burden other communication channels.

Fast image transfer from car to car

immediately creates a good overview.

This avoids stress and significantly relieves drivers.

In the future, every communication channel

will be used for immediate information transmission.

Even street lighting can be used for Li-Fi.

Various local information, such as a traffic jam caused by a traffic accident,

can be transmitted via Li-Fi modules between cars and street lamps.

Optical data transmission helps to better assess the traffic situation

and to react safely and appropriately.

Cars approaching a traffic jam are informed in time;

suitable alternatives can be suggested.

Saving all parking garage maps of a city or of the whole country

requires an unnecessary amount of memory space.

It is important to get the information on the spot, where it is needed.

Especially in underground car parks, radio communication coverage

is often not available.

Illumination, on the other hand, is available everywhere.

Local optical transmission enables the exchange of large amounts of data.

It works like a wireless cable extension.

Li-Fi can do even more:

In future autonomous driving, unforeseen situations can lead to traffic jams.

For example a delivery van blocking the road.

In such a case, autonomous vehicles have to stop the drive for safety reasons.

Therefore, it is important to transmit current road situations quickly.

This should happen in a timely manner and in the immediate proximity,

so that other road users can be informed quickly.

The future Car-to-X communication will be a part of the 5G technology.

Li-Fi can significantly increase the performance of future communication systems.

For the development of applications with Li-Fi,

Fraunhofer HHI offers finished components as “plug and play solutions”.

Modular units can also be individually integrated into customer technologies,

e.g. in the automotive industry.

Please do not hesitate to contact us.