基于正交频分复用的LED非线性信道下的数字预畸变技术  

Digital Pre-Distortion Technique for Orthogonal FrequencyDivision MultiplexingBased LED Nonlinear Channel

作　　者：刘晓爽 李建锋 黄治同[2] 李建科[1] 孙立辉[1] Liu Xiaoshuang;Li Jianfeng;Huang Zhitong;Li Jianke;Sun Lihui(College of Information Technology,Hebei University of Economics and Business,Shijiazhuang,Hebei 050061,China;State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]河北经贸大学信息技术学院,河北石家庄050061 [2]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《激光与光电子学进展》2019年第24期65-70,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金（61801165）;河北省自然科学基金（F2017207006）;河北省应用基础研究计划（16960314D）;河北经贸大学青年科技基金（2016KYQ02,2016KYQ03）

摘　　要：提出一个自适应数字预畸变(DPD)技术,用于消除基于正交频分复用(OFDM)的可见光通信系统中的非线性失真。该自适应DPD利用两路反馈信号来消除信道中的非线性失真,并且利用频域预均衡(pre-FDE)来消除LED信道中的线性失真。所提技术可以有效提升可见光通信系统的性能。实验结果表明提出的自适应DPD方案可以有效消除OFDM的带外和带内噪声。An adaptive digital predistortion(DPD)technique is proposed to eliminate the nonlinear distortion in visible light communication systems based on orthogonal frequency division multiplexing(OFDM).In particular,the nonlinear distortion in the LED channel is eliminated by using the proposed adaptive DPD technique with two feedback signals,whereas the linear distortion in the LED channel is eliminated by preequalization in the frequency domain.The proposed scheme can effectively improve the performance of visible light communication systems.In particular,the experimental results denote that the proposed adaptive DPD scheme can effectively eliminate the outof-band and in-band noise of OFDM.

关 键 词：光通信 调制 非线性 可见光通信 正交频分复用 

分 类 号：TN929.12[电子电信—通信与信息系统]