Visible light wireless communications

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Dr. Fazekas Péter
Department of Networked Systems and Services

Broadband wireless communication at home and in offices can be realized with modern LED based lightings. The technology is called visible light communication, and is using LEDs not just for lighting, but for high speed communication purposes as well.

The recent spread of WiFi networks has arisen several questions about its sustainability. The unlicensed frequency band used for WiFi is now so congested, that the increase of available bandwidth is not possible in densely populated urban areas without the increase of interference which severely deteriorates quality. Thus an alternative form of wireless communication is needed.

Visible light communication (VLC for short) is cheap, secure, power-saver, has high bandwidth capability and serves as lighting too. For these reasons VLC is likely to supplement or replace existing indoor WiFi networks in the near future.

In this paper I shortly introduce the technology, its benefits and weaknesses, and review a few experiments and research directions. Then I design, simulate, build and test a prototype receiver. Finally I conclude the results and propose corrections and developments.


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