联合信道条件下自由空间光通信系统性能分析  

Performance Analysis of Free-Space Optical Communication System under Joint Channel Conditions

作　　者：吴琰 梅海平 魏合理 Wu Yan;Mei Haiping;Wei Heli(Key Laboratory of Atmospheric Optical,Anhui Institute of Optics and Fine Mechanics,Chinese Academyof Sciences,Hefei,Anhui 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei,Anhui 230031,China;School of Electronic Engineering,Hainan Normal University,Huainan,Anhui 232038,China)

机构地区：[1]中国科学院安徽光学精密机械研究所大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230031 [3]淮南师范学院电子工程学院,安徽淮南232038

出　　处：《激光与光电子学进展》2020年第5期92-98,共7页Laser & Optoelectronics Progress

基　　金：安徽省教育厅2018年度高校科学研究项目重点项目(KJ2018A0464)。

摘　　要：大气环境严重影响了自由空间光通信系统的性能。考虑到天气环境、大气湍流以及指向性误差等因素对激光通信的影响,建立了联合信道统计模型,并利用Meijer-G函数推导出基于开关键控调制的自由空间光通信系统的平均误码率、平均信道容量和中断概率等性能参数及其闭合表达式。在不同类型的M湍流、不同的归一化指向性误差以及能见度为5km和20km天气的联合信道条件下,对系统性能参数进行仿真与分析。结果表明:指向性误差越小,通信系统性能参数受湍流影响越大;指向性误差越大,越可能存在最佳光束发散角使得通信系统达到最佳性能。The atmospheric environment seriously affects performance of the free space optical communication system.Considering the influence of weather environment,atmospheric turbulence and directivity error on laser communication,we establish a joint channel statistical model,and derive the performance parameters of free space optical communication system based on on-off keying modulation,such as average bit error rate,average channel capacity and outage probability and their closed expressions,using Meijer-G function.The performance parameters of the system are simulated and analyzed under different M turbulences,different normalized pointing errors and visibilities of 5 km and 20 km.The results show that the smaller the directivity error,the greater the influence of turbulence on the performance parameters of the communication systems;the bigger the directivity error,the more likely for a best beam divergence angle existing to make the communication system achieve the best performance.

关 键 词：自由空间光通信 联合信道 M湍流 平均误码率 平均信道容量 中断概率 

分 类 号：TN929.12[电子电信—通信与信息系统]