作　　者： (王灿）; (周盈君）; (迟楠）;

机构地区： 复旦大学通信科学与工程系、电磁波信息科学教育部重点实验室,上海200433

出　　处： 《中国照明电器》 2017年第7期9-15,26,共8页

摘　　要： 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） means that people are able to use LED designed for illumination to send data for communication, which is another way to improve the communication of the world. But the function of LED transmission is nonlinear; once signal amplitude is larger than a fixed number, the signal will be out of shape which is harm for the transmission. Because of the importance of OFDM （Orthogonal Frequency Division Multiplexing） which shows higher PAPR, more and more researchers are engaged in finding ways to avoid the bad effect of nonlinear distortion in order to improve the capacity of the communication system. Some approaches for resolving the nonlinear distortion were summarized, such as Volterra equalizer, providing a reference to the further study of LED＇s nonlinear compensation technology.

关 键 词： 可见光通信 非线性 预失真 后失真 均衡