中文摘要：

发光二极管（LED）是可见光通信系统（VLC）中最主要的非线性器件,同时由于通带内非平坦的频率响应还伴随着记忆效应。LED的记忆非线性主要恶化了VLC系统的误差矢量幅度（EVM）和比特误码率（BER）。预失真技术通常被用来补偿LED的非线性,从而提高可见光通信系统的性能。现有的预失真技术都不具备自适应性并且没有考虑到LED的记忆效应。提出了一种新的预失真架构,即在发射端增加一路反馈链路来获得LED的输出信号,同时使用记忆多项式模型来自适应地训练并补偿LED的记忆非线性。仿真结果显示提出的预失真技术的BER性能优于现有的方法。

英文摘要：

In a visible light communication（VLC）system,the light-emitting diode（LED）is the major source of nonlinearity and exhibits memory effects due to the in-band non-flat frequency response.The LED nonlinearity with memory effects degrades the error vector magnitude（EVM）and bit error rate（BER）in the VLC system.In general,the predistortion technique is mostly utilized to compensate for the LED nonlinearity and thus enhances the performance of the VLC system.However,the existing predistortion techniques cannot work adaptively and neglect the LED memory effects.A new predistortion architecture is proposed by adding a feedback path to obtain the LED output signal and estimating the LED nonlinearity with memory effects by memory polynomial model adaptively.The simulation results show that the proposed technique outperforms the existing methods in terms of BER.