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郑悦,于掌舵,李艳婷,郑传涛,叶玮琳,王一丁.荧光LED通信系统线性失真测量及其补偿[J].光电子激光,2015,26(2):265~271

荧光LED通信系统线性失真测量及其补偿

Linear distortion measurement and compensation for an LED communication system

投稿时间：2014-08-30

DOI：

英文关键词:visible light communication (VLC) fluorescent LED linear distortion

基金项目:汕头市科技发展计划(2013-04)和吉林大学青年科技创新基金(450060497044)资助项目 (1.吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012；2.汕头大学工学院,广东汕头 515063)

作者	单位
郑悦	吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012
于掌舵	吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012
李艳婷	吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012
郑传涛	吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012
叶玮琳	汕头大学工学院,广东汕头 515063
王一丁	吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春 130012

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中文摘要:

为了改善线性失真对荧光LED通信系统性能的影响,首先建立了通信实验系统, 采用网络分析仪测量了通信系统的幅频响应,分析了线性失真特性。根据通信系统线性失真的测量结果,设计了一、二、三阶高通滤波器作为线性失真补偿电路,将其与荧光LED通信系统级联,分别测量了级联后系统的幅频响应。结果显示,采用三阶补偿电路后,荧光 LED通信系统的线性失真得到了明显改善,系统增益的衰减幅度由补偿前的50dB(0.3~6MHz)降低为三阶补偿后的20dB(0.3~45MHz)。为了确保通信系统具有相对平坦的增益特性且要求系统增益的波动小于10dB时,系统的通频带宽度可从补偿前的1.8MHz提高到三阶补偿后的41MHz (范围为3~44MHz),增大了约23倍,且在此频带范围内,系统具有相对较大的增益(约为－30dB)。因此,补偿荧光LED通信系统的线性失真,可以很好扩展通信系统所需的通频带宽度。本文的实验和分析可为进一步优化系统参数及改进通信性能提供参考依据。

英文摘要:

In order to eliminate the effect of linear distortion on the character istics of fluorescent LED based communication system,an experimental system based on fluorescent LED i s established,a network analyzer is then used to analyze amplitude-frequency r esponse curve of the system,and the linear distortion performance is analyzed.Based on the att enuation characteristics of the amplitude-frequency response,the first-,second- and third-order high-pass filters are designed as linear distortion compensation circuits,and the amplit ude-frequency response curve of the system with distortion compensation is further measured w ith the network analyzer.Experimental results indicate that by using the third-order post-equ alization circuit,the linear distortion of the system is obviously improved,and the decrease of the g ain is improved from 50dB within the range of 0.3－6MHz before compensation to 20dB within th e range of 0.3－45MHz with 3rd order compensation.To ensure relatively flat gain charact eristics of the communication system and obtain a small gain variation of less than 10dB,the b andwidth is enlarged from 1.8MHz before compensation to 41MHz (the range is 3－44MHz) wit h 3rd order compensation,indicating an increase factor of 23,and within this frequency ran ge,a larger gain of －30dB is also achieved.Therefore,by compensating the linea r distortion of the communication system,its bandwidth can be effectively enlarged.The proposed exp erimental and analytical results in this paper can provide data basis for system parameter opt i mization and further improvement in communication performance.

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