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LED记忆非线性自适应预失真技术研究

Research of Adaptive Predistortion Technique for Nonlinear LEDs with Memory Effects

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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。

Abstract

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.

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中图分类号:TN929.12

DOI:10.3788/cjl201441.1105007

所属栏目:光通信

基金项目:国家自然科学基金重点项目(61231009)、上海市科技创新计划(13511503200,13511503202, 13511507502)

收稿日期:2014-06-03

修改稿日期:2014-06-27

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姚赛杰:中国科学院上海微系统与信息技术研究所, 上海 200050中国科学院无线传感网与通信重点实验室, 上海 200050
徐浩煜:中国科学院上海高等研究院, 上海 201210
汪亮友:中国科学院上海高等研究院, 上海 201210同济大学电子与信息工程学院, 上海 201804
周婷:中国科学院上海微系统与信息技术研究所, 上海 200050中国科学院无线传感网与通信重点实验室, 上海 200050
钱骅:中国科学院上海微系统与信息技术研究所, 上海 200050中国科学院无线传感网与通信重点实验室, 上海 200050

联系人作者:姚赛杰(saijie.yao@shrcwc.org)

备注:姚赛杰(1988-),男,博士研究生,主要从事可见光通信系统中非线性信号处理等方面的研究。

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引用该论文

Yao Saijie,Xu Haoyu,Wang Liangyou,Zhou Ting,Qian Hua. Research of Adaptive Predistortion Technique for Nonlinear LEDs with Memory Effects[J]. Chinese Journal of Lasers, 2014, 41(11): 1105007

姚赛杰,徐浩煜,汪亮友,周婷,钱骅. LED记忆非线性自适应预失真技术研究[J]. 中国激光, 2014, 41(11): 1105007

被引情况

【1】朱环宇,朱义君. 基于可见光通信的隐式信息服务系统. 光学学报, 2015, 35(9): 906008--1

【2】迟 楠,张梦洁,施剑阳. 可见光通信中LED非线性失真补偿算法研究. 光学与光电技术, 2015, 13(5): 9-14

【3】王玉皞,曹凡,邓震宇,刘晓东,罗雨桑,马帅,鄢秋荣. 可见光通信中LED非线性补偿和带宽拓展技术. 光电工程, 2020, 47(3): 190671--1

【4】贾科军,杨博然,陆皓,郝莉. 可见光通信光正交频分复用系统符号分解技术抑制LED非线性失真研究. 中国激光, 2020, 47(4): 406002--1

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