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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。
Based on the Shockley equation of a light-emitting diode (LED) with parasitic parameters, a bidirectional saturated nonlinear model of a LED in a visible light communication system is constructed based on the amplitude transmission model of a solid-state power amplifier with saturation characteristics. Based on this model, the influence of LED nonlinearity on the performance of visible light communication system (VLC) using Orthogonal Frequency Division Multiplexing (OFDM) was analyzed by Monte-Carlo simulation. The analysis results show that the performance of OFDM VLC system is directly affected by the non-linear characteristics of LEDI-V, DC bias voltage, baseband modulation, modulation signal topping ratio and mode.