提出一个自适应数字预畸变(DPD)技术,用于消除基于正交频分复用(OFDM)的可见光通信系统中的非线性失真。该自适应DPD利用两路反馈信号来消除信道中的非线性失真,并且利用频域预均衡(pre-FDE)来消除LED信道中的线性失真。所提技术可以有效提升可见光通信系统的性能。实验结果表明提出的自适应DPD方案可以有效消除OFDM的带外和带内噪声。

An adaptive digital predistortion (DPD) technique is proposed to eliminate the nonlinear distortion in visible light communication systems based on orthogonal frequency division multiplexing (OFDM). In particular, the nonlinear distortion in the LED channel is eliminated by using the proposed adaptive DPD technique with two feedback signals, whereas the linear distortion in the LED channel is eliminated by preequalization in the frequency domain. The proposed scheme can effectively improve the performance of visible light communication systems. In particular, the experimental results denote that the proposed adaptive DPD scheme can effectively eliminate the out-of-band and in-band noise of OFDM.