Joint PAPR and Non-linear Distortion Mitigation in OQAM-FBMC Based Visible Light Communication System

Light emitting diode (LED) non-linearities bounds the output performance of visible light communication (VLC) system. LED’s front-end components and high peak to average power ratio (PAPR) of the transmitted signal are the main contributors of distortion in transmitted signal. In this work, both pre-distortion and post-distortion techniques are analyzed for the reduction of non-linear distortion of intensity modulation/direct detection (IM/DD) based channel. The modulation technique used is (OQAM-O-FBMC) offset quadrature amplitude modulation optical filter bank multi-carrier. A hybrid PAPR reduction and non-linear distortion mitigation technique for VLC is proposed. The proposed technique consists of hybrid processing algorithm partial transmit sequence (H-PTS) method for PAPR reduction and kernel minimum symbol error rate (KMSER) based post-distortion method for reduction of non-linear distortion. MATLAB based simulations have been provided for the analysis of proposed hybrid method. The results have shown that proposed hybrid technique shows 2 dB improvement in PAPR and 4 dB improvement in non-linear distortion of VLC system.