空间分集光密钥生成的信道相关性影响  

Channel correlation impact on spatial diversity optical key generation

作　　者：李辉[1,2] 娄岩 赵义武[1,2] 陈纯毅[1,3] 侯艺浩 赵圣亚[1,2] 秦心怡 LI Hui;LOU Yan;ZHAO Yiwu;CHEN Chunyi;HOU Yihao;ZHAO Shengya;QIN Xinyi(National-Local Joint Engineering Research Center for Space Optoelectronic Technology,Changchun University of Science and Technology,Changchun 130022,China;School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;School of Computer Science and Technology,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学空间光电技术国家地方联合工程研究中心,吉林长春130022 [2]长春理工大学光电工程学院,吉林长春130022 [3]长春理工大学计算机科学技术学院,吉林长春130022

出　　处：《光学精密工程》2024年第13期2128-2140,共13页Optics and Precision Engineering

基　　金：吉林省科技发展计划资助项目(No.20240302010GX)。

摘　　要：利用无线光信道本身的特性实现光密钥生成和分发,可为高速星地保密通信提供安全和高效的保障。开展了无线光信道空间分集密钥生成系统相邻子信道相关性的研究。通过实现功率谱反演产生的Kolmogorov大气湍流相位屏,构建了无线光信道(WOC)信道中的多输入多输出(MIMO)模型,采用蒙特卡罗模拟了高斯光束经大气湍流传输特性,比较了不同湍流强度和光束传输距离对光强分布的影响,分析了大气湍流强度、相邻两接收孔径之间的距离、接收孔径、传输距离、光波波长对相邻子信道相关性的影响。结果表明,相邻两接收孔径接收到的光信号功率的相关性随相邻两接收孔径的直径和波长的增大而增加,随相邻两接收孔径之间的距离、光波的传输距离、湍流强度的增加而减小。在大气折射率结构常数C_(n)^(2)为5×10^(-14)m^(-2/3)、接收口径为0.03 m、传输距离为2000 m的近地水平链路条件下,相邻信道之间的距离在0.07 m时接收到的光信号功率的相关性近似为零,此时两个相邻信道彼此独立。该结果可为建立空间分集大气光信道密钥提取系统提供参考。Leveraging the unique properties of wireless optical channels can enhance secure and efficient high-speed communication between satellites and ground stations through optical key generation and distri⁃bution.This paper examines the correlation of adjacent sub-channels in a wireless optical channel spatial multiplexing key generation system.A MIMO model is constructed using phase screens created by power spectrum inversion based on Kolmogorov atmospheric turbulence,simulating Gaussian beam propagation through atmospheric conditions via Monte Carlo methods.We analyze the impact of varying turbulence in⁃tensities,transmission distances,and beam diameters on optical intensity distribution,as well as their ef⁃fects on the correlation between adjacent sub-channels considering factors like turbulence intensity,dis⁃tance between receiving apertures,aperture sizes,transmission distances,and optical wavelengths.The findings indicate that the correlation of optical signal power received by adjacent apertures increases with the diameter and wavelength of those apertures but decreases with the distance between them,transmis⁃sion distance,and turbulence intensity.In near-ground horizontal link scenarios with an atmospheric refrac⁃tive index constant C_(n)^(2)=5×10^(-14)m^(-2/3),a receiver aperture radius of 0.015 m,and a transmission distance of 2000 m,the correlation of optical signal power between adjacent channels is nearly zero at a distance of 0.07 m,suggesting the independence of the two channels.These insights can improve the performance of optical channel key extraction systems in atmospheric conditions.

关 键 词：无线光通信 多输入多输出 信道相关性 密钥生成 湍流相位屏 

分 类 号：TN929.1[电子电信—通信与信息系统]