EXPERIMENTAL RESULTS AND DISCUSSION
One particular advantage of our real-time VLC
system is the use of bidirectional rate-adaptive
OFDM transmission enabling a variable throughput
with controlled error rate, depending on the
quality of the optical communication channel. At
a typical working distance of 2 m between the
ceiling and the tabletop, and in a circular spot
covering a typical working area of roughly 60 cm
in diameter, the system enables a data rate of
200 Mb/s per user. By using the same transceiver
combined with narrow-beam optics, we improved
the system performance, achieving a data rate of
100 Mb/s over 20 m distances. As shown on the
left of Fig. 6, the most important parameter is
the light intensity at the receiver, leading to
nearly proportional adaptation of the data rate.
Thanks to the dynamic rate control, by reducing
the distance or using a more directional beam,
the data rate can steadily be increased until the
500 Mb/s peak data rate is reached (Fig. 6, right).
EXPERIMENTAL RESULTS AND DISCUSSION
One particular advantage of our real-time VLC
system is the use of bidirectional rate-adaptive
OFDM transmission enabling a variable throughput
with controlled error rate, depending on the
quality of the optical communication channel. At
a typical working distance of 2 m between the
ceiling and the tabletop, and in a circular spot
covering a typical working area of roughly 60 cm
in diameter, the system enables a data rate of
200 Mb/s per user. By using the same transceiver
combined with narrow-beam optics, we improved
the system performance, achieving a data rate of
100 Mb/s over 20 m distances. As shown on the
left of Fig. 6, the most important parameter is
the light intensity at the receiver, leading to
nearly proportional adaptation of the data rate.
Thanks to the dynamic rate control, by reducing
the distance or using a more directional beam,
the data rate can steadily be increased until the
500 Mb/s peak data rate is reached (Fig. 6, right).
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