A comparative PAPR, BER, and PSD for optical NOMA communication framework

In this article, we study the effect of peak-to-average power ratio (PAPR) in optical multi-carrier framework communication (OMFC) for 64 and 256-QAM (quadrature amplitude modulation). PAPR is considered a significant problem that significantly degrades the efficiency of the power amplifier. Partial transmission sequence (PTS) is one of the most effective algorithms to lower the high peak amplitude of the structure. The OMFC symbols are weighted with the optimal intelligent PTS phase factor to reduce the high amplitude of the optical waveform, which enhances the efficiency of the system. Parameters such as PAPR, bit error rate (BER), and power spectrum density are also evaluated and analysed. The outcomes of the work reveal that the PTS efficiently reduces the PAPR to 0.4 dB, 1.9 dB, 3.8 dB, and 8.7 dB as compared with selective mapping (SLM), clipping and filtering (C&F), companding, and the original signal for 256-QAM. The PAPR of OMWC for 64-QAM is 11.1 dB, which is decreased by PTS to 1.9 dB, SLM to 3 dB, C&F to 3.3 dB, and the companding technique to 5.2 dB. Further, it also enhances the spectral performance and preserves the BER of the framework.