PAPR Reduction in VLC-OFDM System Using a Combination of Shuffled Frog Leaping Algorithm and Hill-Climbing Algorithm

Orthogonal frequency division multiplexing (OFDM) technique has been widely used in visible light communications (VLC) system (VLC-OFDM). To minimize the performance degradation of VLC-OFDM system caused by high peak-to-average power ratio (PAPR), we propose a SFLAHC-PTS technique to reduce the PAPR of signal in this paper. The proposed SFLAHC-PTS is an improved PTS technique which takes advantages of shuffled frog leaping algorithm and hill-climbing algorithm to optimize conventional PTS technique, reducing the computational complexity of conventional PTS technique. We compare SFLAHC-PTS technique with other PTS techniques on the CCDF performance, as well as computational amount to analyze the superiority of SFLAHC-PTS technique. The results show that the proposed technique can greatly reduce the computational load of conventional PTS technique and has better performance in reducing PAPR than GA-PTS, SFLA-PTS technique.