离散多音调制可见光信道非线性失真及参数优化

发布时间：2018-03-28 14:47

本文选题：无线通信　切入点：可见光通信(VLC)　出处：《光电子.激光》2014年01期

【摘要】：为了改善离散多音调制(DMT)点对点可见光通信(VLC)性能,首先给出了DMT技术原理并建立了实验装置,进而研究了16-相位键控(16-PSK)DMT信号直流偏压和探测器偏置电阻对VLC信道非线性失真的影响。为了使VLC信道工作于良好的线性区,优化得到了不同通信距离下系统的最佳直流偏压和探测器偏置电阻。在VLC信道响应存在非线性失真和调节系统参数使其工作于线性区两种情况下,在0.2Mbit/s数据传输速率下分别开展了通信实验,并测试了系统在不同通信距离处的误码率(BER)。结果显示,BER可由未做参数优化时的10-1量级降至10-3量级;且在20~90cm通信距离范围内BER几乎恒定,表明系统稳定性也得到了明显改善。本文的实验测试和分析结果为进一步优化系统参数及改进通信性能提供了数据依据。
[Abstract]:In order to improve the performance of discrete multitone modulation (DMT) point-to-point visible light communication (VLC), the principle of DMT technology is first presented and the experimental device is established. Furthermore, the effects of DC bias and detector bias resistance on the nonlinear distortion of VLC channel are studied. In order to make the VLC channel work in a good linear region, The optimal DC bias voltage and detector bias resistor are obtained under different communication distances. In the case of nonlinear distortion of VLC channel response and adjusting system parameters to work in linear region, At the 0.2Mbit/s data transmission rate, the communication experiments are carried out, and the bit error rate (BER) of the system at different communication distances is tested. The results show that the BER can be reduced from 10 ~ (-1) to 10 ~ (-3) when the parameters are not optimized. The BER is almost constant in the range of 20~90cm communication distance, which indicates that the stability of the system has also been improved obviously. The experimental results in this paper provide the data basis for further optimizing the system parameters and improving the communication performance.
【作者单位】：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;
【基金】：长春市科技创新基金(10ZC04) 吉林大学青年科技创新基金(450060487479) 吉林大学大学生创新性实验研究计划(2013B51181)资助项目
【分类号】：TN929.1

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