Abstract
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.
© 2010 IEEE
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