PAPR reduction for OFDM‐based visible light communication systems using proposed hybrid technique

• Published in: International journal of communication systems 2018-07, Vol.31 (10), p.n/a
• Main Authors: Freag, Haitham, Hassan, Emad S., El‐Dolil, Sami A., Dessouky, Moawad I.
• Format: Article
• Language: English
• Subjects: Bit error rate; clipping technique; Communication; Data transmission; Distribution functions; Hadamard transform; Hybrid systems; OFDM; Optical communication; Orthogonal Frequency Division Multiplexing; PAPR reduction; Reduction; VLC systems
• ISSN: 1074-5351; 1099-1131
• DOI: 10.1002/dac.3582

Summary Orthogonal Frequency Division Multiplexing (OFDM) is utilized with visible light communication (VLC) systems to decrease the impacts of inter‐symbol interference and to achieve communication with high speed of data transmission and huge bandwidth. In any case, the main problem in OFDM‐based VLC systems is high peak‐to‐average power ratios (PAPRs). This paper proposes a hybrid PAPR reduction technique based on signal transformation combined with clipping. The Hadamard transform is used in the proposed technique to reduce the PAPR without affecting the bit error rate (BER) of the VLC systems. The optimum clipping threshold at which the PAPR is reduced simultaneously with the improvement the BER of the VLC systems is also determined. The performance of the proposed system is assessed in terms of complementary cumulative distribution function and the BER. The obtained results demonstrate that the proposed procedure can simultaneously decrease the PAPR and achieve good BER performance compared to the OFDM‐based VLC system. This paper proposed a hybrid technique which used Hadamard transform and clipping to reduce the PAPR and reduces the BER of OFDM‐based VLC systems. When the clipping ratio = 1.5 has been selected, the PAPR of VLC systems is reduced by 8.2 dB at cumulative distribution function = 10−3, and the Eb/NO performance is reduced by 2 dB than without clipping at BER =10−3 so the BER characteristics would be greater than that without clipping. It was demonstrated that the OFDM‐based VLC system with the proposed technique has the lowest PAPR and low BER compared to other systems so the clipping ratio = 1.5 is the best value for the proposed system.