513 Mbit/s Visible Light Communications Link Based on DMT-Modulation of a White LED

✍ Scribed by Vučič, J.; Kottke, C.; Nerreter, S.; Langer, K.; Walewski, J.W.

• Book ID: 115373408
• Publisher: Optical Society of America
• Year: 2010
• Tongue: English
• Weight: 637 KB
• Volume: 28
• Category: Article
• ISSN: 0733-8724
• DOI: 10.1109/JLT.2010.2089602

✦ Synopsis

We report a visible-light wireless point-to-point communication link operating at 513 Mbit/s gross transmission rate (net 450 Mbit/s). The bit-error ratio of the uncoded data was smaller than 2 10 3 for an illumination level of 1000 lx. The link was based on a commercial thin-film high-power phosphorescent white LED, an avalanche photo diode, and off-line signal processing of discrete multitone signals. Quadrature-amplitude modulation, bit-and power-loading, as well as symmetrical clipping were successfully employed in pushing the gross transmission rate beyond 500 Mbit/s. Adaptation of the clipping level increased the data rate only by 2%, while simulations predicted an enhancement of 20%.Obstacles towards higher data rates as well as potential remedies are discussed. We predicted that data rates of over 1 Gbit/s can be achieved with the same setup and under the same experimental conditions if these obstacles are overcome.