基于FPGA的水下OFDM无线可见光通信系统

发布时间：2018-06-16 16:47

  本文选题：水下无线可见光通信 + OFDM　； 参考：《浙江大学》2017年硕士论文

【摘要】：随着社会的不断发展,陆地上的资源已经难以满足人类日益增长的物质需求,越来越多的国家将目光聚焦于海洋。海洋不仅蕴含着丰富的水产资源,而且蕴藏着难以估计的能源等其它资源,这使得各国掠夺海洋资源的竞争愈演愈烈。科学技术在这场竞争中发挥着重要的作用,为了能够实时监测海洋和智能开发海洋,越来越多的国家在海底布放了观测网络。在海底观测网络中,大量数据需要进行传输与存储,与水声、无线电通信相比较,水下无线可见光通信凭借着高速数据传输的优点而独树一帜。本文分析了当前水下通信技术的现状,详细介绍了正交频分复用(OFDM)关键技术的原理。首先,利用Matlab软件编写发射端信号产生和接收端信号解调的代码,并借助任意波形发生器和混合信号示波器验证了水下OFDM无线可见光通信系统的可行性。随后,使用Quartus Ⅱ 11.0来编写整个通信系统代码并实现基于FPGA的水下无线可见光通信系统。主要模块包括系统工作时钟模块、发射端控制信号模块、长短训练符号生成模块、并串转换模块、正交幅度调制(QAM)模块、快速傅里叶反变换模块、加窗与循环前缀模块、分组检测模块、符号同步模块、快速傅里叶变换模块、信道估计与均衡模块、QAM解调模块以及四位转八位转换模块。采用ModelSim-Altera来仿真整个通信系统,搭建了一套基于FPGA的水下OFDM无线可见光通信测试平台,并将实验结果与仿真结果相对比,验证了该系统能够实现通信功能。在9.375×10-3g/L的Mg(OH)2溶液中通信时,整个通信系统的传输速率能够达到80Mbps,误码率为2.24×10-3,传输距离为2米。
[Abstract]:With the development of society, the resources on land have been unable to meet the increasing material needs of human beings. More and more countries are focusing on the ocean. The ocean not only contains rich aquatic resources but also contains inestimable energy and other resources. Science and technology play an important role in this competition. In order to monitor the ocean in real time and develop the ocean intelligently, more and more countries have placed observation networks on the seabed. In the submarine observation network, a large number of data need to be transmitted and stored. Compared with underwater acoustic and radio communication, underwater wireless visible light communication is unique by virtue of the advantages of high-speed data transmission. In this paper, the present situation of underwater communication technology is analyzed, and the principle of OFDM (orthogonal Frequency Division Multiplexing) is introduced in detail. Firstly, the codes of signal generation and signal demodulation at the transmitter and receiver are compiled by Matlab software, and the feasibility of underwater OFDM wireless visible light communication system is verified by using arbitrary waveform generator and mixed signal oscilloscope. Then, Quartus 鈪，

本文编号：2027418