大气信道简化单次散射模型  

Atmospheric channel simplification single scatter model

作　　者：汤义男[1,2] 赵卫[1] 谢小平[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院研究生院,北京100049

出　　处：《强激光与粒子束》2013年第1期22-26,共5页High Power Laser and Particle Beams

基　　金：中国科学院知识创新工程项目

摘　　要：采用椭球坐标系研究非直视日盲紫外光通信的单次散射模型,求解过程中要对有效散射体的体积进行复杂的数值积分并确定三组积分限。为便于分析,使用近似表达式极大简化了复杂单次散射信道模型,得出路径损耗是收发机几何结构与大气散射吸收系数的函数。对传输距离和路径损耗的仿真证明,该近似表达式与原始模型的所得结果吻合很好。利用该近似表达式,分别仿真分析了大气能见度对紫外光通信系统路径损耗和误码率的影响,仿真结果表明,大气能见度并不是越高越好,而是在能见度为10km时紫外光通信系统有最佳性能。Most existing study on non-line-of-sight solar-blind ultraviolet communication single scatter models use the pro- late-spheroidal coordinates to obtain solutions. In the solving process, the effective scattering volume must undergo the difficult numerical integration and the three groups of integral limits which determine the volume can be calculated. The widely adopted yet complex single-scatter channel model is significantly simplified by means of a closed-form expression for tractable analysis in this paper. And the path loss is given as a function of transceiver geometries as well as scattering and absorption coefficient. The sim- ulation results of transmission distance and path loss show that the approximated path loss matches that from direct numerical in- tegration very well. Using the closed-form expression of path loss, the influence of atmospheric visibility on the path loss and bit- error-rate of the ultraviolet communication system is simulated. The simulation results show that： the better weather and the higher visibility do not result in greater system performances, but when the visibility equals 9-10 km, the best performance can be obtained.

关 键 词：紫外光通信 单次散射模型 路径损耗 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]