基于光信号强度检测法的可见光通信定位方法研究  

Research on visible light communication location method based on opticalsignal intensity detection

作　　者：贾兰芳[1] 周小芳[1] 吕丽君[1] JIA Lanfang;ZHOU Xiaofang;LV Lijun(Department of Electronic Information and Physies Changzhi University,Changzhi Shan'xi 046011,China)

机构地区：[1]长治学院电子信息与物理系,山西长治046011

出　　处：《激光杂志》2021年第5期97-101,共5页Laser Journal

基　　金：国家自然科学基金(No.11704339);山西省教育科学“十三五”规划课题(No.HLW-20120)。

摘　　要：室内可见光通信的各种非线性效应给信号处理带来诸多困难,导致定位误差较大。为此,提出基于光信号强度检测法的可见光通信定位方法研究。根据LED辐射模型,计算聚光度与光源在不同方向上亮度,分析散射拓扑结构,利用发射机对光强不断调制,经过数字化处理建立通信信道模型;使用光信号强度检测法中互相关方式,建立函数表达式,获取信号源强度估计误差,采用小波分析法将信号投影到各小波基分解,处理小波系数重构信号,达到去噪目的;获得光信号强度和光源之间水平距离对应关系,通过最小二乘法对误差函数求导,实现定位。仿真实验表明,所提方法定位精准度高,对噪声有很好的抑制效果。Various non-linear effects of indoor visible light communication bring many difficulties to signal to process,resulting in a significant positioning error. This paper proposes a visible light communication positioning method based on the optical signal strength detection method. According to the LED radiation model,we calculate the concentration and brightness of the light source in different directions,analyse the scattering topology,use the transmitter to continuously modulate the light intensity to establish the communication channel model through digital processing. By using the cross-correlation method in the light signal strength detection method to establish Function expression,we are capable of obtaining the error of the signal source strength estimation. It uses the wavelet analysis method to project the signal to each wavelet base decomposition,processes the wavelet coefficients to reconstruct the signal to denoise the signal. We obtain the corresponding relationship between the optical signal strength and the horizontal distance between the light sources through The least square method derivates the error function to achieve positioning. Simulation experiments show that the proposed method has high positioning accuracy and a good noise suppression effect.

关 键 词：光信号强度检测 可见光通信 定位 小波分析 最小二乘法 

分 类 号：TN929[电子电信—通信与信息系统]