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Performance Analysis of Spectral Efficiently Adaptive Modulation DFT-Spread Polar Coordinate-Based OFDM in Hybrid Fiber-Visible Laser Light Communication System

In this paper, a spectral efficiently adaptive modulation DFT-spread polar coordinate-based orthogonal frequency division multiplexing (P-OFDM) scheme is proposed and demonstrated in a hybrid fiber-visible laser light communication (fiber-VLLC) system. Adaptive modulation scheme and DFT-spread is used to reduce the PAPR and the impact of imbalanced SNR distribution. In contrast, the polar coordinate-based transform is used to obtain real and non-negative symbol to realize full subcarrier use. After 10km SSMF and 5m FSO transmission, the simulation results show that the proposed adaptive 128/64QAM DFT-spread P-OFDM scheme improves both the BER and spectral efficiency in VLLC system.