Abstract
We propose and experimentally demonstrate the first bi-directional optical wireless link operating in
non-direct line-of-sight (Nd-LOS). The system is based on visible light emitting diode (LED) for downlink and infrared
LED for uplink. We achieve around 250 Mbit/s for both downstream and upstream transmission, with the ambient light
noise of usual indoor illumination level (500 lx), produced by warm-white LED. 100 Mbit/s are guaranteed inside
12 m
$^{2}$
of a common room scenario, without LOS tracking. An
optimized discrete multi-tone modulation gives bit-error-ratios always below of the common forward-error-correction
threshold of 1.5 ×10
$^{-3}$
. These results indicate that this
scheme has great potential for practical VLC system implementation.
© 2014 IEEE
PDF Article
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