VLC ACHIEVEMENTS
A couple of research groups have demonstrated
that although illumination LEDs are not intended
for data transmission, they do offer significant
potential for high-speed communications.
Starting with phosphorescent LEDs and simple
on-off keying (OOK) modulation, which enable
100–230 Mb/s data rates [9], transmission speeds
have been increased continuously by applying
more spectrally efficient modulation formats. In
particular, orthogonal frequency-division multiplexing
(OFDM) alias discrete multitone transmission
(DMT1) in several variants have been
studied and evaluated over the years. Using a
phosphorescent LED in an LOS configuration,
data rates up to 1 Gb/s have been achieved in
the laboratory by means of offline-processed
experiments [2], and even rates of up to 1.5 Gb/s
when using RGB-LEDs in a single-color transmission
mode [3, 10]. Work on optimization of
LED modulation is still in progress, for example,
on parameters such as power efficiency
VLC ACHIEVEMENTS
A couple of research groups have demonstrated
that although illumination LEDs are not intended
for data transmission, they do offer significant
potential for high-speed communications.
Starting with phosphorescent LEDs and simple
on-off keying (OOK) modulation, which enable
100–230 Mb/s data rates [9], transmission speeds
have been increased continuously by applying
more spectrally efficient modulation formats. In
particular, orthogonal frequency-division multiplexing
(OFDM) alias discrete multitone transmission
(DMT1) in several variants have been
studied and evaluated over the years. Using a
phosphorescent LED in an LOS configuration,
data rates up to 1 Gb/s have been achieved in
the laboratory by means of offline-processed
experiments [2], and even rates of up to 1.5 Gb/s
when using RGB-LEDs in a single-color transmission
mode [3, 10]. Work on optimization of
LED modulation is still in progress, for example,
on parameters such as power efficiency
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