Redundant run-length limited encoding for two-way visible light communication

Visible light communications (VLC) with light emitting diodes (LEDs) has attracted applications like data communications, lighting control and interaction. In this paper, we propose a system in which two LED devices are used for two-way VLC while also providing illumination. We consider a redundant run-length limited encoding for data transmission. A reception scheme in which the LEDs themselves are used as receivers by sensing in the off period is considered. A prototype of the proposed system is designed and the communication performance is evaluated. An advantage of the proposed system is that no additional light sensors are needed as the LEDs themselves are used as communication transceivers.

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