室外远距离可见光通信系统设计与实现

发布时间：2019-03-30 19:57

【摘要】：可见光通信作为一种新兴无线光通信方式具有广泛的研究价值和应用前景。可见光通信将光作为信息的载体发送，以自由空间作为传输媒质。LED具有绿色安全、发射功率大、架设简单、无需无线电频谱认证等优点。可见光通信的研究方向主要集中在室内可见光通信和智能交通系统，但是对于室外的远距离的可见光通信的研究很少。近些年，室外远距离可见光通信领域得到了更多的关注。本文提出一种远距离可见光通信系统，将基带信号调制在LED发出的可见光上，以大气为信道传输，接收端使用CCD进行接收。论文首先介绍可见光通信系统结构、功能以及可见光在大气信道中传输特性。在发射端，分析可见光OOK调制解调技术以及LED响应特性，对单片机驱动光源电路和码字生成模块进行设计实现；在接收端，首先分析接收设备噪声、信噪比，然后介绍CCD相机接收数据原理，并且完成CCD相机数据接收模块编程设计。之后，基于发射端与和接收端的设计，给出可见光通信系统同步传输方案。最后搭建实验平台，测试背景光噪声，，并且进行信息传输实验。通过接收结果分析，验证了远距离可见光通信的可行性，达到预期目标。
[Abstract]:Visible light communication as a new wireless optical communication mode has a wide range of research value and application prospects. Visible light communication takes light as the carrier of information and uses free space as the transmission medium. Led has the advantages of green security, large transmission power, simple installation and no need for radio spectrum authentication. The research direction of visible light communication mainly focuses on indoor visible light communication and intelligent transportation system, but there is little research on long-distance visible light communication outside. In recent years, more and more attention has been paid to the field of outdoor remote visible light communication. In this paper, a long-distance visible light communication system is proposed. The baseband signal is modulated over the visible light emitted by the LED and transmitted over the atmosphere. The receiver uses CCD to receive it. Firstly, the structure and function of visible light communication system and the transmission characteristics of visible light in atmospheric channel are introduced. At the transmitting end, the visible light OOK modulation and demodulation technology and the characteristic of LED response are analyzed, and the driver light source circuit and the code word generating module are designed and realized. At the receiving end, the noise and signal-to-noise ratio of the receiving equipment are analyzed firstly, then the principle of receiving data for CCD camera is introduced, and the programming design of data receiving module for CCD camera is completed. Then, based on the design of transmitter and receiver, a synchronous transmission scheme of visible optical communication system is presented. Finally, the experiment platform is set up to test the background light noise and carry on the information transmission experiment. Through the analysis of receiving results, the feasibility of long-range visible light communication is verified, and the expected goal is achieved.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1

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