基于海洋湍流效应的水下可见光通信技术研究

RESEARCH ON UNDERWATER WIRELESS OPTICAL COMMUNICATION TECHNOLOGY BASED ON OCEANIC TURBULENCE EFFECT

贺归

11930558

硕士

材料工程

邱成峰

2021-05-20

2021-06-07

南方科技大学

深圳

目前常用的水下无线通信方式有水下声波通信和水下无线电通信，但这两种 通信方式均存在一定的限制。水下声波通信由于声波在水下传播速率的限制，其 传输速率无法得到有效地提升;水下无线电通信由于无线电在海水当中的趋肤效 应，其传输距离往往较短;而水下可见光通信(Underwater Wireless Optical Communication, UWOC)可以在水下实现中长距离的高速通信，因此也成为了研 究热点。目前对 UWOC 的信道研究多数集中在海水的吸收和散射效应。但海洋环境复 杂多变，更是存在远比吸收和散射效应对 UWOC 系统影响更为严重的海洋湍流效 应。目前对海洋湍流的研究还比较少，且多数以仿真和理论模型为主。为了研究 真实海洋湍流下 UWOC 系统的性能，本文基于 Micro-LED 光源的 UWOC 系统， 研究了海洋湍流对 UWOC 系统的影响。主要工作如下:(1) 采用基于水-空气界面全反射的通信链路来进行水下可见光通信，实现了7°全 反射角下通信速率为 300 Mbps，对应 BER 值为 3.10×10-3 的 UWOC 系统。并 基于 7°全反射角研究了水面波动的频率和幅度对 UWOC 系统的影响。(2) 使用长直水管、三通管、软管和潜水泵组成一个封闭循环系统，并使用涡轮流 量计测量了不同的水流流速。利用 NaCl 来模拟吸收型海水，氢氧化镁和氢氧 化铝的混合物来模拟散射型海水，测试了在不同类型的海水和不同水流流速下 UWOC 系统的性能。

Underwater acoustic communication and underwater radio-frequency communication are the commonly used underwater wireless communication methods, but both of these two communication methods have certain limitations. The data rate of underwater acoustic communication cannot be effectively improved due to the limitation of the propagation rate of sound waves under water. The transmission distance of underwater radio-frequency communication is too short due to the skin effect of radio-frequency in seawater. While the Underwater Wireless Optical Communication (UWOC) can realize medium and long-distance high-speed data rate, it has become a research hotspot. At present, the UWOC research is focus on the transceiver devices and modulation methods. For the underwater communication channels, the main research is about the absorption and scattering effects of seawater. However, the ocean environment is complex and changeable, and there are oceanic turbulence effects that are far more serious than absorption and scattering effects on the UWOC system. But there are still relatively few studies on oceanic turbulence, and most of them are based on simulation and theoretical models. To study the performance of the UWOC system under real oceanic turbulence, this paper studied the impact of oceanic turbulence on the UWOC system using Micro-LED as the light source. The main work is as follows: (1)this paper used a communication link based on the total reflection at the water-air interface, and had realized an UWOC system that the data rate of 300 Mbps and corresponding BER value is 3.10×10-3 at a total reflection angle of 7°. Based on the 7° total reflection angle, we studied the influence of the frequency and amplitude of water surface fluctuations on the UWOC system. (2)this paper used long straight water pipes, three-way pipes, hoses, and submersible pumps to form a closed circulation system, and a turbine flow meter was used to measure different water flow velocities. Salt and a mixture of magnesium hydroxide and aluminum hydroxide were used to simulate absorbing seawater and scattering seawater, separately. Then the performance of the UWOC system was tested under different types of seawater and different water flow velocities.

水下可见光通信 水-空气界面全反射 海洋湍流 盐度

underwater wireless optical communication total reflection at the air-water interface oceanic turbulence salinity

中文

独立培养

南方科技大学

贺归. 基于海洋湍流效应的水下可见光通信技术研究[D]. 深圳. 南方科技大学,2021.