水下湍流信道中指向-抖动误差对无线光通信系统性能影响分析  

Influence Analysis of Pointing-Jitter Error on Performance of Wireless Optical Communication Systems in Underwater Turbulent Channels

作　　者：杨祎 闵展望 姚欣钰 窦雨昂 邱晓芬 张建磊 贺锋涛 Yang Yi;Min Zhanwang;Yao Xinyu;Dou Yuang;Qiu Xiaofen;Zhang Jianlei;He Fengtao(School of Electronic Engineering,Xi'an University of Posts&Telecommunications,Xi'an 710121,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《光学学报》2024年第12期43-52,共10页Acta Optica Sinica

基　　金：装备预研教育部联合基金(8091B032130);水下信息与控制重点实验室资助项目(JCKY2021207CD02);陕西省微波光子与光通信创新团队(2021TD-09)。

摘　　要：水下无线光通信(UWOC)系统受到吸收、散射、海洋湍流等信道特性以及无线光通信系统抖动和指向误差的影响,导致信道衰落并影响UWOC系统误码率。首先推导了基于Yue谱的高斯光束经过接收孔径平均后的闪烁指数解析式,其次建立了水下湍流信道无线光通信中的指向-抖动误差模型,该模型综合考虑了水体衰减、海洋湍流等信道衰减和指向-抖动误差损耗引起的链路衰减。同时,引入了信噪比校正因子以模拟高斯光束在衰减信道中的位置衰减量,并分别给出了有无抖动误差时系统误码率的表达式。研究结果表明,在弱湍流信道的UWOC系统中,相比于抖动误差,指向误差对系统性能的影响更大。接收孔径平均技术对湍流信道衰减和指向-抖动误差均具有显著的改善效果。Objective Due to the increasing ocean exploration by a large number of scientific activities and military operations,researchers are investigating high-speed,stable,and long-range underwater wireless communication technologies.Compared with traditional acoustic and radio frequency communications,underwater wireless optical communication(UWOC)systems are attracting a great deal of interest from researchers due to their advantages of big bandwidth,high information transmission rate,and sound confidentiality.However,UWOC systems are not only affected by water absorption but also suffer from the loss caused by misalignment between receiving and transmitting systems or the loss caused by pointing error,which cannot be neglected.Additionally,ocean turbulence also causes flickering of received light intensity,affecting the system performance.However,the inconsistency of salinity diffusion and heat diffusion mechanisms in real marine environments causes unstable seawater stratification,which results in the scintillation effect of the Gaussian beam in the ocean turbulence channel deviating significantly from the actual marine environment.Therefore,a pointing-jitter error model in UWOC is developed by the unstable Yue ocean power spectrum with ocean water stratification.The model takes into account water body attenuation,pointing-jitter error loss,and link attenuation caused by seawater turbulence,and finally investigates the effect of aperture averaging technique on system performance.Methods To more accurately model underwater wireless communication systems,we discuss the effect of pointing-jitter error on the performance of laser communication systems based on a turbulent seawater fading channel.Firstly,for the pointing error,we introduce the relative position parameter of the laser transmitter and the deflection angle parameter to determine the state of the transmitter.Meanwhile,the jitter error is employed to characterize the effect of seawater turbulence on the receiver body.For the effect of seawater turbulence,we a

关 键 词：海洋光学 无线光通信 海洋湍流 指向误差 闪烁指数 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]