On the Performance of Single- and Multi-carrier Modulation Schemes for Indoor Visible Light Communication Systems

摘要

In this paper, we investigate and compare the performance of single- andmulti-carrier modulation schemes for indoor visible light communication (VLC).Particularly, the performances of single carrier frequency domain equalization(SCFDE), orthogonal frequency division multiplexing (OFDM) and on-off keying(OOK) with minimum mean square error equalization (MMSE) are analyzed in orderto mitigate the effect of multipath distortion of the indoor optical channelwhere nonlinearity distortion of light emitting diode (LED) transfer functionis taken into account. Our results indicate that SCFDE system, in contrast toOFDM system, does not suffer from high peak to average power ratio (PAPR) andcan outperform OFDM and OOK systems. We further investigate the impact of LEDbias point on the performance of OFDM systems and show that biasing LED withthe optimum value can significantly enhance the performance of the system.Bit-interleaved coded modulation (BICM) is also considered for OFDM and SCFDEsystems to further compensate signal degradation due to inter-symbolinterference (ISI) and LED nonlinearity.