Published Paper Details:

OFDM is an appealing modulation and multiple access technology for channels having a non-flat frequency response because it eliminates the need for complicated equalisers. Orthogonal Frequency Division Multiplexing In terms of bandwidth efficiency, resistance against multipath fading, and cost-effective implementation, it can deliver excellent results. There are a few downsides to this method, including its high peak-to-average power ratio (PAPR). Because of its adaptability and scalability, OFDM is a viable option for CR systems. A non-contiguous OFDM (NCOFDM) technique is proposed in this dissertation, where the implementation achieves high data rates of noncontiguous subcarriers while avoiding any interference. DFT precoding and Gaussian minimum shift keying (GMSK) pulse shaping are used in an unique modulation strategy proposed in this research to lower the PAPR of OFDM-based VLC systems. In addition, to deal with the increased complexity of the DFT precoding system, the notion of group precoding is added. As compared to DFT precoded O-OFDM and O-OFDM counterparts, the findings reveal that different variants of the proposed system provide superior PAPR, symbol error rate (SER), and power-saving performance Furthermore, the proposed system's PAPR analysis, computational complexity, and spectral efficiency have been studied and reported in this research.