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非视距水下无线光通信传输信道脉冲响应特性研究
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Abstract:
非视距水下无线光通信利用光散射进行传输，可以缓解视距水下无线光通信对准的要求。脉冲响应可以很好的反映水下无线光通信系统的信道性能。本文提出了一种基于指向概率法改进的非视距水下无线光通信传输信道模型，基于此模型模拟了不同海水环境、不同收发机距离、不同波长对脉冲展宽的影响。仿真结果表明脉冲展宽效应随光波长的增大、海水浑浊度的减小、传输距离的减小而减小。文中所提出的非视距传输模型为水下非视距无线光通信传输信道特征描述提供了一种足够准确和现实的方法，对分析和开发有效的水下无线光通信系统具有一定参考价值。
Non-line-of-sight underwater wireless optical communication uses light scattering for transmission, which can alleviate the alignment requirements of line-of-sight underwater wireless optical communication. The impulse response can well reflect the channel performance of the underwater wireless optical communication system. In this paper, an improved non-line-of-sight underwater wireless optical communication transmission channel model based on the pointing probability method is proposed. Based on this model, the effects of different seawater environments, different transceiver distances, and different wavelengths on impulse response are simulated. The simulation results show that the pulse broadening effect decreases with the increase of light wavelength, seawater turbidity, and transmission distance. The proposed non-line-of-sight transmission model provides an accurate and realistic method for channel feature description of underwater non-line-of-sight wireless optical communication, which has a certain reference value for analyzing and developing an effective underwater wireless optical communication system.
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