基于白光LED的室内可见光通信系统研究

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	基于白光LED的室内可见光通信系统研究
	唐丹颖
学位类型	硕士
导师	裴为华研究员
	2014-05-24
学位授予单位	中国科学院研究生院
学位授予地点	北京
学位专业	微电子学与固体电子学
关键词	可见光通信光电探测器平衡编码可见光音频传输
其他摘要	LED由于其节能、环保、高效、寿命长的特性，在照明领域中得到推广，并占据越来越重要的位置。以LED作为通信光源的可见光通信技术在近年也成为了研究热点。可见光通信技术用于商场、家庭可作为传统射频无线通信的补充，还可用于飞机、医院、矿井等电磁敏感区，填补这类地区无线通信的空白。可见光作为一种传输媒介，可以在照明的同时实现文本、声音、图像、视频等信息的传播，为人们提供一种新的信息交流方式。可见光音频传输是可见光通信技术是一个很重要的应用研究。本文对可见光通信系统中涉及的关键技术进行了建模和理论分析，对LED稳定照明技术作了编码上的改进，并对可见光音频传输相关技术进行深入的研究。本文的创新点和主要研究成果如下：1.对室内可见光通信系统的结构、编码方式、光源等进行性能分析，并建立了可见光通信系统接收端光电探测器的P-I特性非线性模型，基于该模型研究了探测器工作于饱和区对可见光通信系统幅频响应的影响。2.研究了可见光通信系统稳定照明编码技术，提出了针对大数据量传输的改进型直流平衡编码，在大数据量传输的情况下提高编码效率，降低编码冗余，保证了音频信号传输的流畅度。3.提出了即时播放的单片机控制音频传输系统和存储播放的现场可编程门阵列控制音频传输两种可见光音频传输系统的实现方案，对比两种方案的优缺点，重点对第二种方案进行研究和分析，结合掉电非易失存储设备进行音频信息的存储，实现既存储又播放的功能。对可见光音频传输系统软件设计部分作了深入研究，分析系统的传输协议和检错纠错能力，并通过仿真测试进行验证。; Light Emitting Diodes(LEDs) are becoming more and more popular and has had its own space in the lighting field owing to its special characteristics. They are energy-saving, environmental-friendly, efficient and have a long lifetime. The visible light communication(VLC) technology based on semi-conductor lighting source has become popular too in recent years. It can be used in a supermarket or at home to provide a second choice for traditional wireless communication technologies. And it can also be used on plane, in the hospital and under the mine where traditional wireless communication technologies cannot be used. As a kind of transmitting method, visible light is able to transmit words, sounds, pictures and even videos, which provides people a new information exchanging approach. And it is of great benefit to do some research on transmitting audio through visible light communication technology.In this thesis, we focus on the VLC key technology. The researches establish the photodiodes’ models, do some analysis, improve the LED stable lightening method using a new balanced coding technology and do some research on the visible light audio transmitting system. The main innovation points and achievements are as follows.1. The researches first analyze the structure, the coding methods, the lighting source and so on in the indoor visible light communication system. Also, a nonlinearity model of the photodiode’s P-I characteristics is established at the receive end of the visible light communication, and the effects on the frequency response of the visible light communication system when photodiode becomes saturated is studied based on the nonlinearity model.2. The coding method of realizing stable lightening of the visible light communication is studied. The researches come up with the improved balanced coding under the circumstance of transmitting large amounts of data, in that case, the efficiency is improved and the coding redundancy is lowered to ensure the fluency of the audio transmition.3. Two methods of realizing visible light audio transmitting system are designed, and their advantages and disadvantages are discussed. Then the researches focus on the second method and realize the function of both storing and broadcasting the audio, with the help of power down non-volatile storage device storing the audio message. At the same time, we study hard on the software designation of the visible light audio transmitting system, analyze the transmitting protocol and the ability of correcting the errors, and check them through experiments.
学科领域	微电子学
语种	中文
公开日期	2014-05-27
文献类型	学位论文
条目标识符	http://ir.semi.ac.cn/handle/172111/25007
专题	光电子研究发展中心
推荐引用方式 GB/T 7714	唐丹颖. 基于白光LED的室内可见光通信系统研究[D]. 北京. 中国科学院研究生院,2014.

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