基于∑△调制器的非线性可见光通信系统研究

Study on Nonlinear Visible Light Communication System based on Sigma-Delta Modulation

VLC(可见光通信)系统中,LED(发光二极管)的调制带宽会限制传输速率,其非线性也会影响系统的整体吞吐量。针对OFDM(正交频分复用)VLC系统中由于高峰均比引起的非线性失真问题,提出了一种基于一位∑△调制器的非线性VLC系统。研究表明:在OFDM VLC系统中引入一位∑△调制器,能够提高频谱利用率,改善LED非线性对系统性能的影响。

In Visible Light Communication （VLC） system, the modulation bandwidth of Light Emitting Diode （LED） is limited by the transmit rate. In addition, the nonlinearity in the LED limits the overall throughput of the VLC system. In order to solve the problem of the nonlinearity in the LED in OFDM VLC with high peak-to-average power ratio, a one-bit sigma-delta modulator for nonlinear visible light communication systems is proposed. Studies show that the one-bit sigma-delta modulator can significantly improve spectral efficiency and the VLC system performance with OFDM modulation.