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Light fidelity prototype transmits data at 10MB/s

Posted: 31 Mar 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Li-Fi? CEA-Leti? LED?

CEA-Leti has built a prototype for wireless high data rate light fidelity (Li-Fi) transmission that employs the high the high-frequency modulation capabilities of LED engines used in commercial lighting.

The device achieves 10Mb/s transmission rate at a range of three metres using light power of less than 1,000 lumens and with direct or even indirect lighting.

CEA-Leti is forecasting data transmission rates in excess of 100Mb/s with traditional lighting based on LED lamps using this technology approach and without altering the high-performance lighting characteristics.

The optical system consists of an A19 lamp based on LEDs at the transmitter and an avalanche photodiode at the receiver. The digital communication component is implemented on a proprietary and reconfigurable platform that carries out a flexible multi-carrier modulation.

As part of its Ecodesign process, the European Union has established a schedule for LED lighting penetration (regulation No. 1194/2012) which will help drive Li-Fi technology developments. Halogen lamps will be phased out and replaced by LED lighting in September 2016 in 30 European countries.

Moreover, because LEDs can be modulated at high frequencies and their oscillations are invisible to humans, they permit information transmission at high data rates.

Other technical and market factors also are increasing interest in data transmission through lighting. These include crowding of the conventional radiofrequency (RF) spectrum, the mobile data-traffic explosion in cellular networks, and the need for wireless data transmission without electromagnetic field (EMF) interference.

The demonstration is part of the organisation's project that begun in 2013 to achieve a high data rate Li-Fi prototype by applying its expertise in digital communications, hardware prototyping and solid-state lighting.

CEA-Leti is demonstrating the prototype at the upcoming Light + Building 2014 in Frankfurt, with Li-Fi as a promising alternative to conventional RF wireless communications and as an introduction to its focus on component optimisation to offer a bidirectional link.

- Paul Buckley
??EE Times Europe

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