Comparison of Modulation Schemes toward Coverage Area in indoor Visible Light Communication

This paper discusses about the effect of different modulation schemes on the coverage area of an indoor visible light communication. The idea of this research is based on the importance of using modulation techniques as needed. The main subject of this paper is power efficiency of each modulation referring to the coverage area. The modulation techniques used in this paper included On-Off keying Non return to zero (OOK-NRZ), On-Off Keying Return to Zero (OOK-RZ), Direct-current Biased Optical OFDM (DCO-OFDM), and Unipolar OFDM (U-OFDM). This paper presents the result of power efficiency, coverage area and Bit Error Rate performance of each modulation technique. The modulation technique producing the best performance in this paper was U-OFDM that had the highest power efficiency and the widest coverage area.