基于STM32的室内LED可见光通信系统研究

发布时间：2018-11-10 18:03

【摘要】：随着人们对宽带移动通信需求的日益增长和全光通信技术的发展,无线光通信技术(Wireless Optical Communication)因其无需频带申请、信息容量大、造价低、灵活方便、易于维护等特点受到人们的极大关注。它是一种以光信号为信息载体、大气作为信息传输媒质来传送光信号的宽带无线接入技术,其结合了无线通信技术(Wireless Communication)和光通信技术(Communication)。进入20世纪以来,半导体照明技术发展迅猛,它具有稳定性高、寿命长、光效高、安全性好、功耗低、绿色环保、抗震、可靠耐用等特点,成为新一代的照明光源。又因为其响应时间短、高速的发光响应和调制的特性,可作为光通信系统的光源。德国的物理学家哈拉尔德·哈斯和其英国爱丁堡大学的团队利用LED光源发明了一种专利技术：“看不见”的网络信号依赖一盏小小的灯变成“看得见”的网络信号,利用闪烁的灯光来传输数字信息。这个过程被称为可见光通信技术,人们亲切地称它为"Lifi". 本论文设计了一种室内LED可见光通信系统。该系统利用LED作为通信光源,通过串口将发射端电脑的信源信息传送到STM32,进行信源调制。调制后的电信号驱动LED发出人们肉眼觉察不出来的高速变换的光信号。光信号经过自由空间传输后,通过菲涅尔透镜聚光和蓝色滤光片过滤投射到光电探测器上。光信号被光电探测器接收转换得到电信号,经过均衡、判决和解码等过程还原出信息,传到接收端的电脑上,从而完成数据的传输。本论文首先对室内LED可见光通信技术进行了原理分析,特别是对室内LED可见光通信系统信道进行了深入分析,包括LED的光源特性、通信链路和信道分析。在此基础上,设计了系统的总体方案,完成了数据的串口通信部分、功率放大部分、驱动电路部分、接收机部分的设计和实现。
[Abstract]:With the increasing demand for broadband mobile communication and the development of all-optical communication technology, wireless optical communication technology (Wireless Optical Communication), because of its large information capacity, low cost, flexibility and convenience, is not required to apply for frequency band. People pay great attention to the characteristics of easy maintenance. It is a broadband wireless access technology which uses optical signal as information carrier and atmosphere as information transmission medium to transmit optical signal. It combines wireless communication technology (Wireless Communication) and optical communication technology (Communication). Since the 20th century, semiconductor lighting technology has developed rapidly. It has the characteristics of high stability, long life, high light efficiency, good security, low power consumption, green environmental protection, earthquake resistance, reliability and durability. Because of its short response time, high-speed luminous response and modulation, it can be used as the light source of optical communication system. Harald Haas, a German physicist, and his team at the University of Edinburgh in the UK have developed a patented technology using LED light sources: "invisible" network signals rely on a small lamp to become "visible" online signals. Use flashing lights to transmit digital information. This process is called visible light communication technology and is affectionately referred to as "Lifi". In this paper, an indoor LED visible light communication system is designed. The system uses LED as the communication light source and transmits the source information of the transmitter computer to STM32, through serial port for source modulation. The modulated signal drives the LED to emit a high-speed converted optical signal that is invisible to the naked eye. The optical signal is transmitted through free space and projected onto the photodetector through Fresnel lens and blue filter. The optical signal is received and converted by the photodetector to obtain the electrical signal. After equalization, decision and decoding, the information is restored to the computer at the receiving end, and the data is transmitted to the computer. In this paper, the principle of indoor LED visible light communication technology is analyzed, especially the channel of indoor LED visible light communication system, including the light source characteristic, communication link and channel analysis of LED. On this basis, the overall scheme of the system is designed, the serial communication part of the data, the power amplifier part, the driving circuit part and the receiver part are designed and implemented.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1

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