摘要
码间干扰直接影响可见光通信系统的通信性能,当前的应对方法存在一定的不足,为了实现系统信号稳定传输,文章采用基于小波变换的可见光通信系统码间干扰抑制技术,在分析可见光通信系统信道模型和信号多径特征基础上,利用小波变换将系统回波数据频谱变换到小波域,在小波域内通过恒虚警概率方法识别码间干扰小波系数,构建码间干扰小波系数的恒虚警检测器,将小波系数大于检测门限的码间干扰去除,实现对可见光通信系统码间干扰的抑制。实验结果表明,该方法的信号干扰抑制比和信号失真比均较低,可提高可见光通信系统的输出信噪比,有效抑制码间干扰对系统信号频谱的影响,保证系统信号传输稳定性。
The inter-symbol interference(ISI)directly affects the communication performance of the visible light communication system.There are some shortcomings in the current methods.In order to achieve stable transmission of the system signal,the inter-symbol interference suppression technology of the visible light communication system based on wavelet transform is designed.On the basis of analyzing the channel model and signal multipath characteristics of the visible light communication system,the wavelet transform is used to transform the system echo data spectrum into the wavelet domain.In the wavelet domain,the constant false alarm probability method is used to identify the inter-symbol interference wavelet coefficients,and the constant false alarm detector of the inter-symbol interference wavelet coefficients is constructed.The inter-symbol interference of the visible light communication system is suppressed by removing the inter-symbol interference whose wavelet coefficients are greater than the detection threshold.The experimental results show that the method has low signal interference rejection ratio and signal distortion ratio,can improve the output signal to noise ratio of visible light communication system,effectively suppress the influence of inter-symbol interference on the system signal spectrum,and ensure the stability of system signal transmission.
作者
张守叶
ZHANG Shouye(Lanzhou Bowen University of Science and Technology,Lanzhou 730101,China)
出处
《数字通信世界》
2023年第2期84-88,共5页
Digital Communication World
关键词
小波变换
可见光
通信系统
码间干扰
抑制技术
信道模型
wavelet transform
visible light
communication system
inter symbol interference
inhibition technology
channel model
作者简介
张守叶(1984-),女,甘肃靖远人,讲师,本科,研究方向为通信与信息系统、信号与信息处理。
