可见光通信中直流偏移的ACO-OFDM分集合并接收机  

ACO-OFDM Diversity Combining Receiver with Direct Current Offset in Visible Light Communications

作　　者：李建锋 刘晓爽 李建科[1] 伍亚丽 黄治同[2] Li Jianfeng;Liu Xiaoshuang;Li Jianke;Wu Yali;Huang Zhitong(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》2020年第19期81-85,共5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);河北省高等学校科学技术研究项目(ZD2020163);河北经贸大学教研项目(2020JYQ05,2020JYY50);河北经贸大学青年科技基金(2016KYQ02,2016KYQ03)。

摘　　要：针对存在直流(DC)偏移的非对称限幅光正交频分复用(ACO-OFDM)系统,提出了一个只采用单次快速傅里叶变换(FFT)的分集合并接收机。在可见光通信(VLC)系统中,背景光源会不可避免地导致接收端产生DC偏移。通过对称恢复操作可以在时域重构ACO-OFDM系统的奇、偶信号,从而估计出系统的DC偏移量。结果表明,提出的分集合并接收机具有较低复杂度,对直流分量不敏感,同时具有与传统分集合并接收机相同的分集增益。Aiming at the asymmetrically clipped optical orthogonal frequency division multiplexing(ACO-OFDM)systems with direct current(DC)offset,a diversity combining receiver using single fast Fourier transform(FFT)is proposed.In a visible light communication(VLC)system,the background light source will inevitably cause a DC offset at the receiving end.Through the symmetric recovery operation,the odd and even signals of the ACO-OFDM system can be reconstructed in the time domain to estimate the DC offset of the system.The results show that the proposed diversity combining receiver has lower complexity,is insensitive to DC components,and has the same diversity gain as that of the conventional diversity combining receiver.

关 键 词：光通信 非对称限幅光正交频分复用 调制 分集合并 直流偏移 

分 类 号：TN929.12[电子电信—通信与信息系统]