FSO在室内雾信道的模拟研究  

Simulation study of FSO in the indoor fog channel

作　　者：康莉 汤璇 林邦姜 谢宇芳 骆加彬 戴玲凤 李小禹 KANG Li;TANG Xuan;LIN Bangjiang;XIE Yufang;LUO Jiabin;DAI Lingfeng;LI Xiaoyu(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Quanzhou Fujian 362000,China)

机构地区：[1]中国科学院福建物质结构研究所,福建泉州362000

出　　处：《光通信技术》2021年第6期48-52,共5页Optical Communication Technology

基　　金：中国科学院科研仪器研制项目(YJKYYQ20170052)资助;福建省科技计划项目(2017I0020、2018H2001)资助;福建省中科院STS计划配套项目资助;泉州市科技计划项目(2019C010R、2020G18、2020C069)资助;福建武平工业园区管理委员会创新创业升级项目资助。

摘　　要：针对自由空间光(FSO)通信在雾天时系统性能急剧下降的现象和大气中雾天的衰减数据采集困难的问题,创新性地在室内搭建了FSO通信系统来模拟激光在雾天的传输,研究了雾天FSO通信的衰减情况,构建了该室内FSO通信系统的信道概率模型。在室内FSO通信系统中模拟了1550 nm波长激光在不同能见度下传输的衰减情况,分析了不同能见度下FSO信号的统计特性,选用Gamma拟合分布建立了信道概率模型,采用强度调制/直接探测的开关键控调制方式推导出该FSO通信系统在不同链路长度、不同能见度和不同发射功率下的误码率性能,实验验证了模拟信道的可行性。Aiming at the problem of the phenomenon that the system performance of free space optical(FSO)communication drops sharply and the difficult problem of attenuation data acquisition in the fog environment,this paper sets up an innovative indoor FSO communication system to simulate the transmission of laser in foggy weather.The attenuation condition of FSO communication in foggy weather is studied and the channel probability model of the indoor FSO communication system is constructed.In the indoor FSO communication system,this paper simulates the 1550 nm wavelength laser under different visibility of transmission attenuation condition,analyzes the statistical characteristics of FSO signals under different visibility,chooses Gamma fitting distribution to establish channel probability model.By using intensity modulation/direct detection and on-off keying modulation method,the bit error rate of the FSO communication system under different link length、different visibility and different transmission power is deduced.The experiment verifies the feasibility of the analog channel.

关 键 词：自由空间光通信 雾信道 能见度 衰减概率 

分 类 号：TN256[电子电信—物理电子学]