PAPR reduction using a Precoder and Compander combination in a NOMA-OFDM VLC system

The power domain non-orthogonal multiple access (NOMA) protocol is proposed as a viable 5G visible light network solution. Orthogonal frequency division multiplexing access (OFDM) is anticipated to exist in 5G systems due to a number of important characteristics, including multi-path fading tolerance, low latency, and high compatibility with multiple input multiple output (MIMO) systems. The optical OFDM (OOFDM) system based on NOMA is a promising contender for supporting fast packet switching network especially in green indoor mobile networks. The OFDM waveform suffers from high PAPR issues. The high PAPR degrades the BER and also enhances the nonlinearity in an O-OFDM system. This research uses a hybrid technique that combines a precoder and a $\mu$-compander to reduce the PAPR of a NOMA-based DC-biased O-OFDM (DCO-OFDM) system. The proposed NOMA DCOOFDM system exhibits a low PAPR of only 4.3 dB. Also, for a reference bit error rate of 10-4, the proposed technique displays an error vector magnitude (EVM) of 13.2 dB.