水下湍流对轨道角动量通信系统信道容量的影响  

Influence of underwater turbulence on channel capacity of orbital angular momentum communication system

作　　者：胡涛[1] 潘孙翔 王乐[1] 赵生妹[1,2] HU Tao1, PAN Sunxiang1, WANG Le1, ZHAO Shengmei1,2(1 Institute of Signal Processing and Transmission, Nanjing University of Posts.and Telecommunications Nanjing 210003, China; 2 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education Nanjing University of Posts and Telecommunications, Nanjing 210003, China)

机构地区：[1]南京邮电大学信号处理与传输研究院,江苏南京210003 [2]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,江苏南京210003

出　　处：《量子电子学报》2018年第4期499-506,共8页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金;61475075;61271238;教育部"宽带无线通信与传感网技术"重点实验室开放课题;NYKL2015011~~

摘　　要：研究了水下湍流对轨道角动量(OAM)通信系统的性能影响,分析了不同环境参数和传输距离下OAM通信系统信道容量的变化.结果表明,水下湍流环境中随着传输距离、湍流动能耗散率和温度耗散率的增加,OAM态光束模式之间串扰加强,信道容量下降.当传输距离达到7 m左右,信道容量下降为原来的一半;当湍流动能耗散率为10^(-4)m^2/s^3,容量下降到理论最大值的75%;当温度耗散率为10^(-8)K^2/s,信道容量下降到理论上最大值的一半;水下环境中盐度扰动比温度变化扰动对OAM通信系统性能的影响更大。Influence of underwater turbulence on the performance of orbital angular momentum（OAM）communication system is investigated. The change of OAM communication system capacity with different environment parameters and transmission distances is presented. Results show that in underwater turbulence environment, the crosstalk between OAM beam modes is enhanced and channel capacity decreases with the increasing of transmission distance, dissipation rates of turbulent flow and temperature. When the transmission distance approaches 7 m, the channel capacity decreases to half of the original one. When the turbulence kinetic energy dissipation is close to 10-4 m2/s3, the capacity decreases to 75% of the theoretical maximum. When the temperature dissipation rate is 10-8 K2/s, the channel capacity reduces to half of the theoretical maximum. In underwater environment, salinity disturbance has a greater influence on the capacity performance than that of temperature disturbance.

关 键 词：光通信 轨道角动量态 水下湍流 拉盖尔-高斯光束 信道容量 

分 类 号：TN929.3[电子电信—通信与信息系统]