Performance Analysis of Peak to Average Power Ratio in Multi Carrier Modulation Schemes of Visible Light Communication

Abstract

VLC system based on the OFDM technology suffers from the high PAPR affecting the performance of the System. ACO-OFDM and DCO-OFDM are the major multi carrier modulation schemes in VLC. High PAPR not only leads to distortion and degradation of performance of VLC system but also makes system complex. SLM and PTS techniques are attractive PAPR reduction techniques in VLC system which provide significant reduction in PAPR. Combination of PTS and SLM with DCT gives better result in terms of PAPR reduction. In this research work, the partitioned sub blocks data are firstly transformed by a DCT into new modified data and the scheme utilizes the PTS and SLM technique to further reduce the PAPR of the OFDM signal. The PAPR performance is evaluated using a simulation and the results show that the new scheme yields improved PAPR performance in comparison to PTS, SLM, DCT, PTS+SLM scheme and original OFDM.