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可见光通信(VLC)可以利用照明用的LED灯进行信息传递,为通信领域拓宽了另一扇大门。但是LED的传递曲线并非线性的,当信号能量达到一定幅度,信号进入LED的非线性区导致变形,会为传递信息带来诸多麻烦。由于正交频分复用技术(Orthogonal Frequency Division Multiplexing,OFDM)是可见光通信中重要的调制方式之一,其高PAPR(峰均功率比)特性会增大信号传递在LED的非线性区的概率,所以大量专家学者致力于VLC系统的抗非线性方法来提高通信系统的性能。本文对现有已经提出的不同的抗非线性的方法进行探讨总结,如Volterra均衡技术等,为进一步理解和研究可见光通信系统的抗非线性技术提供参考。
Visible light communication (VLC) can use the LED lighting for lighting information transmission, broaden another door for the communication field. However, the transmission curve of the LED is not linear. When the signal energy reaches a certain amplitude, the signal enters the non-linear region of the LED and causes deformation, which brings a lot of trouble for transmitting information. Since Orthogonal Frequency Division Multiplexing (OFDM) is one of the most important modulation methods in visible light communication, its high PAPR (Peak-to-Average Power Ratio) feature increases the probability of signal transmission in the nonlinear region of the LED , So a large number of experts and scholars devote themselves to the anti-nonlinear method of VLC system to improve the performance of communication system. In this paper, different existing methods of anti-nonlinearity are put forward, such as Volterra equalization technique, etc., to provide references for further understanding and research of anti-nonlinear technology of visible light communication system.