基于频域预补偿的PAM可见光通信系统  

A Frequency-Domain Pre-Compensation Scheme for Pulse Amplitude Modulation Visible Light Communication System

作　　者：陈桐新 文鸿 陈青辉 刘克雄 CHEN Tongxin;WEN Hong;CHEN Qinghui;LIU Kexiong(College of Computing,Hunan University of Technology,Zhuzhou Hunan 412007,China)

机构地区：[1]湖南工业大学计算机学院,湖南株洲412007

出　　处：《湖南工业大学学报》2023年第4期56-62,共7页Journal of Hunan University of Technology

基　　金：国家重点研发计划基金资助项目(2018YFB1801503);湖南省自然科学研究基金资助项目(2020JJ6087,2022JJ5006);湖南省教育厅科学研究基金资助项目(20c0609,22A0418)。

摘　　要：在可见光通信(VLC)系统中,脉冲幅度调制(PAM)由于其原理简单、功率损耗率较低等优势而受到了人们的广泛关注。然而,光电器件的带宽受限以及非线性效应会导致信号的高频功率衰减,从而降低信号传输的有效带宽和系统性能。因此,提出了一种基于频域预补偿的PAM8-VLC系统,通过对PAM8信号的S21响应曲线进行频域预补偿,以抑制高频功率衰减对信号传输性能的影响。实验结果表明,经过3.5 m的自由空间可见光链路传输,相比于未补偿的PAM8信号,采用所提出的预补偿PAM8信号,在误码率低于硬判决前向纠错(HD-FEC)门限下,可以提高2 dB的接收灵敏度,同时,实现了1.8 Gbit/s的系统传输速率。Pulse amplitude modulation(PAM)signal has attracted wide attention due to its simple application principle and low power consumption in the visible light communication(VLC)system.However,a high-frequency power attenuation of signals may result from the bandwidth limitation and nonlinear effects of optoelectronic devices,which reduces the effective bandwidth and system performance of signal transmission.Therefore,a PAM8-VLC system has thus been proposed based on frequency domain precompensation,which suppresses the impact of high-frequency power attenuation on signal transmission performance by performing a frequency domain precompensation on the S21 response curves of the PAM8 signals.The experimental results show that after a 3.5 m free space visible light link,the pre-compensated PAM8 signals,compared with non-pre-compensated PAM8 signals,can improve the reception sensitivity by 2 dB with an error rate lower than the hard decision forward error correction(HD-FEC)threshold,meanwhile achieving a system transmission rate as high as 1.8 Gbit/s.

关 键 词：可见光通信 脉冲幅度调制 预补偿 数字信号处理 

分 类 号：TN929.1[电子电信—通信与信息系统]