MAP equalization in indoor visible light communication

Abstract

Since indoor visible light communication (VLC) systems can offer several potential advantages over their radio frequency and infrared counterparts, there has been a growing interest in VLC systems. Influenced by the complicated optical propagation environment, multipath effect existed which may result in intersymbol interference (ISI). Therefore, the bit error ratio (BER) performance is degraded excessively due to the effects of ISI. In this paper, we evaluate the performance of a nonlinear MAP (maximum a-posteriori probability) equalizer in indoor VLC environment. Moreover, Forward error correction (FEC) coding and interleaving is used. It will be shown that MAP equalization is well behaved in VLC systems. Besides, the systems with encoder and interleaver provide notable performance gain at the expense of higher computational complexity.