中国激光, 2011, 38 (8): 0805007, 网络出版: 2011-07-27
LED非线性对基于正交频分复用可见光通信系统的影响 下载: 583次
Study of the Impact of LED Nonlinearity on Orthogonal Frequency Division Multiplex Based Visible Light Communication Systems
光通信 可见光通信 正交频分复用 发光二极管 非线性失真 optical communications visible light communications orthogonal frequency division multiplex light-emitting diode nonlinearity distortion
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LED I-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。
Abstract
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.
杨宇, 张建昆, 刘博, 陈弘达. LED非线性对基于正交频分复用可见光通信系统的影响[J]. 中国激光, 2011, 38(8): 0805007. Yang Yu, Zhang Jiankun, Liu Bo, Chen Hongda. Study of the Impact of LED Nonlinearity on Orthogonal Frequency Division Multiplex Based Visible Light Communication Systems[J]. Chinese Journal of Lasers, 2011, 38(8): 0805007.