Wu Hongyu, Kang Dongpeng, Ding Junrong, Yang Jingkai, Wang Qiang, Wu Jiajie, Ma Jing
Opt Express. 2022 Nov 7;30(23):41028-41047. doi: 10.1364/OE.466367.
In this paper, we numerically study the secrecy performance of the free-space optical (FSO) system by considering different eavesdropping scenarios. More precisely, we considered three possible eavesdropping scenarios for Eve: 1) Eve is between Alice and Bob; 2) Eve and Bob are in the same receiving plane; 3) Eve is behind Bob. We adopt the Málaga ()-distribution channel to model atmospheric turbulence due to the presence of link blockage while considering the non-zero boresight pointing error and path loss. To do so, we obtain a novel probability density function (PDF) and cumulative distribution function (CDF) under different eavesdropping scenarios, based on which we derived the secrecy outage probability (SOP) analytical expressions as well as their asymptotic expressions at a high SNR regime. We verified the results using Monte Carlo simulations, which showed that the parameters related to atmospheric turbulence and pointing errors, as well as the location of the eavesdropper, have different effects on different eavesdropping scenarios.
在本文中，我们通过考虑不同的窃听场景，对自由空间光（FSO）系统的保密性能进行了数值研究。更确切地说，我们考虑了 Eve 的三种可能窃听场景：1）Eve 在 Alice 和 Bob 之间；2）Eve 和 Bob 在同一接收平面；3）Eve 在 Bob 后方。我们采用马拉加（Málaga）分布信道来对由于链路阻塞的存在而产生的大气湍流进行建模，同时考虑非零视轴指向误差和路径损耗。为此，我们在不同窃听场景下获得了一个新的概率密度函数（PDF）和累积分布函数（CDF），在此基础上我们推导了保密中断概率（SOP）的解析表达式及其在高信噪比（SNR） regime 下的渐近表达式。我们使用蒙特卡罗模拟验证了结果，结果表明与大气湍流和指向误差相关的参数以及窃听者的位置对不同的窃听场景有不同的影响。
