摘要
针对吸收和散射衰减导致光子在水下运动时具有复杂性的问题,基于追踪的水下单光子运动状态,建立了光子时空随机信道模型。针对不同的水质类型、链路距离、接收孔径、发射角和视场角,统计了接收端到达光子的相关信息,研究了基于水下单光子通信系统的光接收强度和信道脉冲响应的影响因素。同时,综合考虑光子发射情况、水下光子运动过程、探测器特性和同步信号提取方法等,采用了一种基于时隙内光子计数的数据解调方案,并对系统性能进行分析。仿真实验结果表明:发射角和接收孔径是影响时延展宽的主要因素;接收孔径越大,系统误码率(BER)越小;而链路距离和发射角越大,系统BER越大;噪声系数越大,系统BER越大,且建模的理论通信距离约为185 m。实验结果很好地描述了水下光子散射特性和脉冲时延展宽特性。
According to the complexity of photon motion under water caused by absorption and scattering attenuation,this paper establishes a photon spatio-temporal random channel model based on the tracked underwater single-photon motion state.Considering different types of water qualities,link distances,receiving apertures,launching angles,and field of view angles,the relevant information of the photons arrived at the receiving end was counted and the factors influencing optical receiving intensity and channel impulse response based on underwater single-photon communication system were studied.At the same time,comprehensively considering the photon emission,underwater photon movement process,detector characteristics,and synchronization signal extraction method,etc.,a data demodulation scheme based on photon counting in the time slot was adopted and the system performance was analyzed.The simulation results show that the launching angle and receiving aperture are the main factors that affect the delay broadening.The larger the receiving aperture,the smaller the system bit error rate(BER);the larger the link distance,launching angle,and noise factor,the larger the system BER.The theoretical communication distance is about 185 m.The results well describe the characteristics of underwater photon scattering and pulse delay broadening.
作者
戴伟辉
鄢秋荣
王明
杨程
Dai Weihui;Yan Qiurong;Wang Ming;Yang Cheng(Information Engineering School,Nanchang University,Nanchang,Jiangxi 330031,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第17期202-210,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61865010,61565012)
江西省杰出青年人才资助计划(20171BCB23007)。
关键词
光通信
水下通信
光子时空随机信道模型
蒙特卡罗方法
信道特性
系统误码率
optical communications
underwater communication
photon spatio-temporal random channel model
Monte-Carlo method
channel characteristic
system bit error rate
