基于白光LED的可见光通信系统的设计与实现

发布时间：2018-11-14 12:20

【摘要】：可见光通信(VLC)是基于第四代环保节能照明光源LED而新兴的一种新型的通信方式。它将载波频率上调到了无线电波中的可见光频段,能极好的解决无线射频通信频谱资源问题。同时,可见光通信可以广泛用于对电磁波敏感的场合,如飞机、医院等。另一方面,可见光通信作为一种新的通信方式,可以与传统射频通信兼容,丰富和增强无线通信接入的方式及效果。现阶段可见光通信已经成为通信领域的研究热点,其应用具有广阔的发展前景。本文针对适用于室内的可见光通信系统进行深入研究。论文首先对白光LED和光电检测(PD)二极管的工作原理及特性进行了阐述,并针对这些特性对可·见光通信系统的性能影响进行了分析；其次,基于室内可见光点对点直射视距(LOS)通信模型,研究了室内信道环境下可见光通信系统信道特性,分析了室内可见光通信链路构成结构,详细阐述了系统各个组成部分所需实现的功能。在此基础上,本文重点研究了适用于室内应用的可见光通信系统的设计与实现方案,提出了一种基于单片机为控制核心、采用IM/DD检测技术的室内可见光通信系统。系统设计包括了硬件电路设计方面的LED驱动电路、信号调制电路,PIN前置放大电路、滤波电路等；嵌入式软件编程方面的PPM调制解调技术算法实现、CRC校验技术的实现等。论文研究搭建了室内可见光通信系统实验平台,完成了室内环境下的文本信息传输,并且对设计搭建的实验系统平台完成了相应的通信性能的测试,针对距离、角度、背景光等信道参数对系统通信性能影响的实验结果进行了分析,获得了对室内VLC原理及系统性能的深入理解。系统测试验证了设计方案的可行性及有效性。论文研究工作为进一步进行可见光通信应用的研究提供了具体的理论依据和实验基础。
[Abstract]:Visible light communication (VLC) is a new communication method based on the fourth generation environmental protection and energy saving lighting source LED. It upregulated the carrier frequency to the visible light band in the radio wave, which can solve the problem of radio frequency spectrum resource. At the same time, visible light communication can be widely used for electromagnetic wave sensitive occasions, such as aircraft, hospitals and so on. On the other hand, as a new communication mode, visible light communication can be compatible with the traditional radio frequency communication, enrich and enhance the way and effect of wireless communication access. At present, visible light communication has become a research hotspot in the field of communication, and its application has broad development prospects. In this paper, we study the visible light communication system which is suitable for indoor. Firstly, the working principle and characteristics of white LED and (PD) diode are described, and the influence of these characteristics on the performance of visible optical communication system is analyzed. Secondly, based on the indoor visible point-to-point direct line-of-sight (LOS) communication model, the channel characteristics of the indoor visible light communication system are studied, and the structure of the indoor visible light communication link is analyzed. The functions of each component of the system are described in detail. On this basis, this paper focuses on the design and implementation of visible light communication system, which is suitable for indoor application, and puts forward a kind of indoor visible light communication system based on single chip microcomputer and IM/DD detection technology. The system design includes the LED drive circuit, signal modulation circuit, PIN preamplifier circuit, filter circuit and so on, the realization of PPM modulation and demodulation technology in embedded software programming, the realization of CRC check technology and so on. The thesis studies and builds the indoor visible light communication system experiment platform, completes the text information transmission under the indoor environment, and completes the corresponding communication performance test to the designed experimental system platform, aiming at the distance and the angle. The experimental results of the influence of the background light and other channel parameters on the communication performance of the system are analyzed, and an in-depth understanding of the indoor VLC principle and the performance of the system is obtained. The system test verifies the feasibility and effectiveness of the design. The research work in this paper provides a theoretical and experimental basis for further research on the application of visible light communication.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1

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