Enghiyad Nima, Ghorban Sabbagh Abbasali
J Opt Soc Am A Opt Image Sci Vis. 2022 Jan 1;39(1):115-126. doi: 10.1364/JOSAA.435288.
Recently, compared with acoustic and radio methods, underwater optical wireless communications has been considered as a high-speed and high-bandwidth transmitting method at a lower cost. Absorption, scattering, and optical turbulence are three destructive phenomena that affect the performance of underwater optical communication systems. In this work, we use computer simulations to mimic the statistical behavior of underwater media employing the Monte Carlo method. Our simulation results for optical turbulence are in good agreement with the lognormal probability density function, which describes weak turbulence well, and they deviate as the turbulence moves away from weak. By considering the combined effect of absorption, scattering, and turbulence (AST) phenomena, we obtain the underwater channel's impulse response (IR). We demonstrate that there is no noticeable difference between the mean of ensemble IRs of the AST channel and the IR of the channel when turbulence is not taken into account. Moreover, our results predict that tripling the coastal link length from 10 to 30 m increases the average variance of sample IRs of the AST channel from their ensemble average by more than five times.
最近，与声学和无线电方法相比，水下光无线通信被视为一种低成本的高速、高带宽传输方法。吸收、散射和光学湍流是影响水下光通信系统性能的三种破坏性现象。在这项工作中，我们使用计算机模拟，采用蒙特卡罗方法来模拟水下介质的统计行为。我们对光学湍流的模拟结果与对数正态概率密度函数吻合良好，该函数能很好地描述弱湍流，而随着湍流偏离弱湍流状态，模拟结果会出现偏差。通过考虑吸收、散射和湍流（AST）现象的综合影响，我们得到了水下信道的脉冲响应（IR）。我们证明，在不考虑湍流时，AST信道的总体IR均值与信道的IR之间没有明显差异。此外，我们的结果预测，将沿海链路长度从10米增加到30米，AST信道样本IR的平均方差相对于其总体平均值增加了五倍多。
