A scheme called clipping-piecewise linear companding (C-PLC) was proposed in this paper to address the problem of high clipping noise and peak-to-average power ratio (PAPR) in optical orthogonal frequency division multiplexing (O-OFDM) signal for visible light communication (VLC) systems. The clipping information of the signal could be retained by adding a suffix at its end, which could reduce the clipping noise and PAPR of the VLC system, thus limiting the dynamic range of the signal effectively. In addition, the retained clipping information could be recovered at the receiver, with which the bit error rate (BER) performance could be pronouncedly improved. Furthermore, PLC could map bipolar signals into unipolar signals suitable for VLC and effectively reduce the PAPR of the signals. Simulation results showed that C-PLC system has lower PAPR than that of direct-current biased optical-OFDM and μ-OFDM schemes, and it also demonstrates an improved BER performance. This work will be of good help for the research and development of VLC system.

中文翻译：

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通过将限幅和分段线性压扩相结合来降低基于 OFDM 的 VLC 系统的 PAPR

针对光正交频分复用 (O-OFDM) 信号中的高限幅噪声和峰均功率比 (PAPR) 问题，本文提出了一种称为限幅分段线性压扩 (C-PLC) 的方案。可见光通信 (VLC) 系统。通过在其末尾添加后缀可以保留信号的削波信息，从而降低VLC系统的削波噪声和PAPR，从而有效地限制了信号的动态范围。此外，保留的限幅信息可以在接收器处恢复，从而可以显着提高误码率（BER）性能。此外，PLC可以将双极性信号映射为适合VLC的单极性信号，有效降低信号的PAPR。仿真结果表明，C-PLC 系统的 PAPR 比直流偏置光 OFDM 和 μ-OFDM 方案的 PAPR 低，并且还展示了改进的 BER 性能。这项工作将对VLC系统的研究和开发有很好的帮助。