Abstract
We previously proposed inverse source
coding (ISC) to maximize the transmission rate in visible light
communications with dimming capability using ON–OFF keying. First, this
paper extends the proposed ISC approach to <i>M</i>-ary pulse amplitude modulation and
obtains the optimal probability distributions. Then, dimming capacity is used
to compare the existing analog dimming approach, the extended ISC approach,
and the hybrid of these approaches. We conclude that ISC is the best approach,
and threshold values for adaptive modulation are derived depending on signal
quality and dimming target.
© 2012 IEEE
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