Experimental performance evaluation of weak turbulence channel models for FSO links
Experimental performance evaluation of weak turbulence channel models for FSO links
复制标题
FSO链路弱湍流通道模型的实验性能评估
DOI：
10.1016/j.optcom.2021.126776
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发表时间：
2021
影响因子：
2.4
通讯作者：
M. Esmail
中科院分区：
文献类型：
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作者：
M. Esmail
室外无线通信受多种室外环境条件的影响。其中，每天都会发生的大气湍流会引入信号衰落，降低系统性能。文献中提出了许多信道模型来模拟自由空间光通信系统中的湍流衰落。在这项工作中，我们的目标是在弱湍流条件下评估FSO系统的一些关键信道模型的性能。首先，利用室外实验装置测量湍流衰落并建立数据集。该装置是全光学的，这给了我们在测量过程中隔离太阳辐射噪声的优势。其次，使用获得的数据集来研究声称在弱湍流条件下表现良好的五个关键FSO信道模型的性能。结果表明，对于闪烁指数(SI)< 10−3的极弱湍流，4个声称在此条件下工作良好的模型无法拟合数据集。对于SI> 0 0−3的弱湍流，除IK模型外，其余模型均与数据集拟合。第三，我们利用获得的数据集提出了一个新的经验通道模型，该模型在弱湍流条件下具有良好的性能。利用该模型，研究了弱湍流和雾衰减共同作用下FSO系统的中断概率。
Outdoor wireless communication is subject to several outdoor environment conditions. Among them, atmospheric turbulence which happens on a daily basis, introduces signal fading and degrades the system performance. Many channel models have been proposed in the literature to model the turbulence fading in free space optic (FSO) communication systems. In this work, we aim to evaluate the performance of some key proposed channel models for FSO systems under weak turbulence condition. First, an outdoor experimental setup is utilized to measure the turbulence fading and build a dataset. The setup is all-optical, which gives us the advantage of isolating the solar radiation noise during measurements. Second, the obtained dataset is used to investigate the performance of five key FSO channel models claimed to perform well under weak turbulence conditions. The results show that for very weak turbulence with scintillation index (SI)< 1 0− 3, four models that claim to work well under such condition failed to fit the dataset. For weak turbulence with SI> 1 0− 3, all the models fit the dataset except IK model. Third, we exploited the obtained dataset to propose a new empirical channel model that has good performance under weak turbulence conditions. Using this model, we studied the outage probability of FSO system under the joint effect of weak turbulence and fog attenuation.