Three layer hybrid PAPR reduction method for NOMA-based FBMC-VLC networks

Visible light communication (VLC) becomes an interesting technology for next-generation networks due to its wide license-free spectrum. However, the limited modulation bandwidth of the light sources remains a challenge for VLC networks. To address this issue, a new architecture that combines both non-orthogonal multiple access (NOMA) and filter bank multicarrier communication (FBMC) is suggested in this paper to improve spectrum efficiency in VLC networks. However, this enhancement comes with the drawback of a high peak-to-average power ratio (PAPR). Therefore, this paper also proposes a three-layer hybrid PAPR reduction method based on integrating amplitude clipping (AC) and selective mapping (SLM) techniques with Lifting Wavelet Transform (LWT). The proposed method improves both the bit error rate (BER) and PAPR performances of the NOMA based FBMC-VLC network. Applying the proposed PAPR reduction method to the NOMA-based FBMC-VLC architecture achieve a notable enhancement in throughput while simultaneously improving both PAPR and BER performances. The results demonstrate a notable increase in network throughput, with gains of 9 b/s/Hz and 2 b/s/Hz in comparison to conventional FBMC and the system outlined in Hesham and Ismail (Opt Quant Electron 54:201, 2022), respectively. Furthermore, both PAPR and BER performances exhibit satisfactory improvements of 7.75 dB and 10 dB, respectively, following the application of the proposed hybrid PAPR reduction method.