LED非线性信道下基于对称恢复的ACO-OFDM性能研究  

Symmetry Recovery-Based ACO-OFDM Performance in LED Nonlinear Channel

作　　者：刘晓爽 李建锋 李建科[1] 孙立辉[1] 黄治同[2] 康红俊[1] Liu Xiaoshuang;Li Jianfeng;Li Jianke;Sun Lihui;Huang Zhitong;Kang Hongjun(Information Technology College,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21期18-23,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：针对可见光通信系统中的LED非线性失真效应,提出基于对称恢复的非对称限幅光正交频分复用(ACOOFDM)接收机。利用ACO-OFDM的对称恢复特性,可以在时域实现奇数和偶数子信道之间的频谱分集。理论与实验证明,该方案在高非线性的可见光通信系统上实施效果良好。仿真结果证明了所使用的分集合并方案优于传统的ACO-OFDM方法。此外发现,增加调制指数导致较为显著的非线性时,该方案能够呈现出更好的性能。A symmetry recovery-based receiver in an asymmetrically clipped optical orthogonal frequency division multiplexing(ACO-OFDM)system is proposed to achieve LED nonlinearity in visible light communication systems.Based on the symmetric recovery characteristics of ACO-OFDM,a spectral diversity that combines odd and even sub-channels can be achieved in the time domain.Theoretical and experimental results show that the proposed scheme has a good performance when it is applied to a highly nonlinear visible light communication system.Simulation results demonstrate that the proposed method outperforms conventional ACO-OFDM solutions.Furthermore,we find that the proposed method exhibits better performance when an increased modulation index leads to significant nonlinearity.

关 键 词：光通信 调制 可见光通信 非对称限幅光 正交频分复用 分集合并 

分 类 号：TN929.12[电子电信—通信与信息系统]