摘要可见光通信(Visible Light Communication, VLC)是利用白光LED发出高频率闪烁的光来进行通信的无线光通信技术，它具有对人体安全、保密性好、抗电磁干扰能力强和通信速率高等优势，同时能够兼顾原有的照明功能。目前，可见光通信技术得到了各国的关注和认可。68511

课题在研究白光LED的室内可见光通信基本理论及技术的基础上，重点研究可见光通信相关关键技术，为今后进一步研究、加快该技术的实用化奠定基础。先通过LED本身的伏安特性对驱动电路进行了研究。其次由于可见光的特殊性，需要着重考虑到发射光源的布局问题，分别从光源数量和距离两个种方面来进行讨论。对于信道编码方面，对解决突发错误的编码进行研究，其中级联码是很有效的一种编码方式。

  其次针对调制方式，文章分别介绍了通断键控(On-Off Keying, OOK)、脉冲位置调制(Pulse Position Modulation, PPM)、脉冲宽的调制(Pulse Width Modulation, PWM)、正交频分复用调制(Orthogonal Frequency Division Multiplexing, OFDM)。着重分析了能够有效应对多径效应的OFDM调制技术，最后对OFDM技术进行仿真，比较分析了各种技术的效果，得出OFDM技术能够有效的应对多径干扰的结论。

关键词  可见光通信  LED  正交频分复用

毕业设计说明书（论文）外文摘要

Title    Research on Key Technology of visible light    communication                                  

Abstract

Visible light communication is a new wireless optical communication technology which uses white LED to emit high frequency flashing light to communicate. It has lots of advantages including good confidentiality, strong ability of anti-electromagnetic interference and high communication rate. When it lights your room, it can transfer data at the same time. Nowadays, VLC has become the research hotspot in many countries.

The topic focuses on the key technologies of VLC to lay the foundation for further research and to accelerate the practical technology, based on research the basic theory. First, through voltage characteristics of the LED drive circuit has been studied. Second, because of the special nature of visible light, we should consider the layout problem of light source. The topic is pided into two aspects to discuss, respectively the number and distance. For the channel coding, this topic solved the in-depth study of burst error code. The cascade code is a very effective way.

For the modulation, the article introduced the OOK, PPM, PWM, OFDM modulation technique. Finally, the article simulates the OFDM technology and compares the effect of different kinds of technology. The conclusion is that OFDM technology is a very effective way to deal with the multipath interference.

Keywords  VLC  LED  OFDM

目 次

1  绪论 1

1.1  研究背景及研究意义 1

1.2  国内外发展和研究现状 2

1.3  本文的主要内容 4

2  LED驱动 6

2.1  LED调制特性 6

2.2  LED驱动电路 8

3  光源分布研究 10

3.1  LED光源的研究 10

3.2  光源距离分析 12

4  信道编码技术研究 13

4.1  VLC信道编码