论文部分内容阅读
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。
In order to improve the performance of discrete multi-tone (DMT) point-to-point visible light communication (VLC), the principle of DMT and the experimental setup are first presented. Then the DC bias and detection of 16-phase keying Effect of Bias Resistance on Nonlinear Distortion of VLC Channel. In order to make the VLC channel work in a good linear region, the optimal DC bias and detector bias resistance of the system are optimized under different communication distances. Under the condition of nonlinear distortion in the channel response of VLC and the adjustment of the system parameters in the linear region, two communication experiments are carried out at the data rate of 0.2Mbit / s and the error codes of the system at different communication distances are tested Rate (BER). The results show that the BER can be reduced from 10-1 to 10-3 when parameters are not optimized, and the BER is almost constant over the communication range of 20-90cm, which shows that the system stability has also been significantly improved. The experimental test and analysis results in this paper provide data basis for further optimization of system parameters and improvement of communication performance.