Abstract
Visible light communications (VLC) in indoor environments suffer from the limited bandwidth
of LEDs as well as from the inter-symbol interference (ISI) imposed by multipath. In this work,
transmission schemes to improve the performance of indoor optical wireless communication (OWC)
systems are introduced. Expurgated pulse-position modulation (EPPM) is proposed for this
application since it can provide a wide range of peak to average power ratios (PAPR) needed for
dimming of the indoor illumination. A correlation decoder used at the receiver is shown to be
optimal for indoor VLC systems, which are shot noise and background-light limited. Interleaving
applied on EPPM in order to decrease the ISI effect in dispersive VLC channels can significantly
decrease the error probability. The proposed interleaving technique makes EPPM a better modulation
option compared to PPM for VLC systems or any other dispersive OWC system. An overlapped EPPM
pulse technique is proposed to increase the transmission rate when bandwidth-limited white LEDs
are used as sources.
© 2013 IEEE
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