LED非线性对基于正交频分复用可见光通信系统的影响  

Study of the Impact of LED Nonlinearity on Orthogonal Frequency Division Multiplex Based Visible Light Communication Systems

作　　者：杨宇[1] 张建昆[1] 刘博[1] 陈弘达[1] 

机构地区：[1]中国科学院半导体研究所,北京100083

出　　处：《中国激光》2011年第8期173-178,共6页Chinese Journal of Lasers

基　　金：国家863计划(2010AA0321614001);中国科学院知识创新工程重要方向性项目(2006A10401006)资助课题

摘　　要：基于带有寄生参数的发光二极管(LED)Shockley方程,结合具有饱和特性的固态功率放大器的幅度传输模型,构建了可见光通信系统中LED的双向饱和非线性模型。基于该模型,通过蒙特-卡洛仿真分析了LED非线性对采用正交频分复用(OFDM)的可见光通信系统(VLC)性能的影响。分析结果表明OFDM的VLC系统性能受LEDI-V特性非线性、直流偏置电压、基带调制方式、调制信号切顶比率及方式的直接影响。From the light-emitting diode （LED） Shockley equation, a LED＇s bidirectionally saturated nonlinearity model in visible light communication （VLC） system is established in conjunction with high power amplifier model which shows saturated behavior at very large input voltage. Monte Carlo simulations are conducted to an orthogonal frequency division multiplex （OFDM） based VLC system using the LED model. Manifold analyses suggest that the system performance deeply depends on some key parameters in respect of LED nonlinearity, direct current （DC） bias voltage, baseband modulation scheme, signal clipping ratio, and the manner in which the signal is clipped.

关 键 词：光通信 可见光通信 正交频分复用 发光二极管 非线性失真 

分 类 号：TN929.12[电子电信—通信与信息系统]