红外与激光工程, 2017, 46 (4): 0422004, 网络出版: 2017-06-30   

蒙特卡洛仿真的水下激光通信信道特性

Monte Carlo simulation on channel characteristics of underwater laser communications
作者单位
西北工业大学 航海学院, 陕西 西安 710129
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
The channel characteristics were investigated for underwater laser communications based on Monte Carlo simulation method. Using the blue-green laser with wavelength 532 nm, the impulse response of link was discussed both in theorem and simulation. Also the channel parameters such as the water type, attenuation length, divergence angle, beam width, received field-of-view(FOV), received aperture were taken into account. Monte Carlo simulation experiment was verified. Simulation results suggest that in clear water, the channel can effectively be considered as non ISI when working distance less than 40 m. Therefore, it practically did not need to perform computationally complex signal processing at the received end. However, in harbor water, the channel delay spread enlarged with larger received FOV or divergence angle, and the data transmission efficiency was reduced. When the attenuation length was smaller than the diffused length, the received intensity decreased with received aperture enlarged. In contrast, the received intensity enhances with larger received aperture at the small FOV, however, they trend to similar regardless of the apertures at large FOV. Therefore, the results give us some insight in terms of what constitutes an accurate underwater laser communication channel.

黄爱萍, 张莹珞, 陶林伟. 蒙特卡洛仿真的水下激光通信信道特性[J]. 红外与激光工程, 2017, 46(4): 0422004. Huang Aiping, Zhang Yingluo, Tao Linwei. Monte Carlo simulation on channel characteristics of underwater laser communications[J]. Infrared and Laser Engineering, 2017, 46(4): 0422004.

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