可见光通信中LED非线性失真补偿算法研究

Research of LED's Nonlinear Distortion Compensation Algorithm in Visible Light Communications

可见光通信(VLC)技术是一种新型的无线光通信技术,它兼具照明和通信,有许多优点及广阔的应用前景,已成为近年来通信领域研究的热点。发光二极管(LED)是VLC系统中常用的光源,LED具有较强的非线性,会显著降低VLC系统的性能。为了补偿LED的非线性失真,研究人员已经提出了多种附加失真补偿方法,主要包括预失真补偿技术和后失真补偿技术。对这两类技术中的不同方法进行了探讨,比较总结了它们的特点,预失真技术实施简单但不符合成本效应,而后失真技术不需额外电路但所需的计算复杂度较高。这为深入理解和进一步研究LED非线性补偿技术提供了参考。

Visible light communications（VLC） is an emerging wireless optical communications technology, which combines lighting and communications, and has many advantages and broad application prospects that makes it have been a research hotspot in the field of communications in recent years. The light-emitting diode（LED） is the source of the VLC system, and it has strong nonlinearity that will significantly degrade the performance of the VLC system. In order to compensate for the nonlinear distortion of LED, researchers have proposed a variety of additional distortion compensation method, including predistortion and postdistortion technique. In this paper, the different methods of these two types of technology are dis cussed. Besides, we compare and summarize their characteristics for providing a reference to the in-depth understanding and further study of LED＇s nonlinear compensation technology. Predistortion technology is simple to implement but does not meet the cost-effective, while postdistortion technology without the additional circuitry but has higher computational complexity.