蒙特卡洛仿真的水下激光通信信道特性

发布时间：2018-05-11 20:11

本文选题：水下激光通信 + 信道特性　；参考：《红外与激光工程》2017年04期

【摘要】：针对海洋激光通信信道复杂多变的问题,利用理论分析和蒙特卡洛模拟方法详细研究了水下光通信链路的信道特性。采用波长为532 nm的蓝绿激光,分析了典型海水中的信道脉冲响应,研究了接收光强与海水类型、衰减长度、发散角、波束宽度、接收视角及孔径等重要参数的关系,并通过蒙特卡洛仿真实验进行验证。理论分析与仿真结果表明:清澈海域中,传输距离40 m时,可认为无码间干扰信道,接收端不需要复杂的信号处理算法;但在海港浑浊海域,时延扩展随着接收视角和发散角的增大而增大,从而降低信道的传输效率。当衰减长度小于等于漫射长度时,接收光强随接收孔径的增大而减小;但当衰减长度大于漫射长度时,接收光强随着接收视角的增大呈现先增后恒的趋势。因此,研究结果将对建立准确的水下无线光通信信道模型具有重要的参考价值。
[Abstract]:Aiming at the complex and changeable channel of ocean laser communication, the channel characteristics of underwater optical communication link are studied in detail by theoretical analysis and Monte Carlo simulation method. The channel pulse response in typical seawater is analyzed by using a blue-green laser with wavelength of 532 nm. The relationship between the received light intensity and the important parameters such as the type of seawater, attenuation length, divergence angle, beam width, receiving angle of view and aperture is studied. It is verified by Monte Carlo simulation experiment. The theoretical analysis and simulation results show that when the transmission distance is 40 m in the clear sea area, it can be considered that there is no ISI channel and the receiving end does not need complicated signal processing algorithm, but in the turbid sea area of the harbour, The delay spread increases with the increase of the receiving angle and divergence angle, which reduces the transmission efficiency of the channel. When the attenuation length is less than or equal to the diffuse length, the received light intensity decreases with the increase of the receiving aperture, but when the attenuation length is larger than the diffuse length, the received light intensity increases first and then is constant with the increase of the receiving angle. Therefore, the results of the study will have an important reference value for the establishment of an accurate underwater wireless optical communication channel model.
【作者单位】：西北工业大学航海学院;
【基金】：国家自然科学青年基金(61404362) 西北工业大学校基础研究基金(3102016ZY005)
【分类号】：TN929.3

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