摘要可见光通信技术是基于白光LED的一项新兴的无线光通信技术,在室内可见光系统中,白光LED兼有照明和通信两种功能,与其他无线光通信技术相比,可见光通信技术较容易消除阴影效应,没有发射功率的限制,无电磁干扰,提供了一种安全、布局简单的通信方式。63701
本文在对室内可见光通信系统结构整体把握的基础上,对室内可见光通信系统的关键技术做了研究,探讨了可见光通信系统的信道特性,详细分析了室内可见光的通信链路链接方式和直流增益分析,另外提出了一种基于正交频分复用调制方式来消除码间干扰的问题,接着探讨了白光LED的特性、室内光源的合理布局及其推导,最后重点研究了光发射和接收技术,对光发射端的驱动电路原理进行了探讨,在把握光接收机内部构造的基础上,对光集中器做了改进,设计菲涅尔透镜代替普通的平凸透镜。
毕业论文关键词:室内可见光通信 白光LED OFDM 光源布局 菲涅尔透镜
毕业设计说明书(论文)外文摘要
Title The research of visible light communication techniques based on White LED
Abstract
Visible light communication(VLC) is a emerging wireless communication technology which based on White LED .White LED combines two functions of lighting and communication .Compared to others wireless optical communication technology , VLC is more easier to eliminate the shadow effect ,and it has no limit of transmitted power ,which provides a safe ,simple means of communication.
In this paper, first, introduce the overall structure of indoor visible light communication system, we research on the key techniques of indoor visible light communication system, explore the channel characteristics of VLC, analysis the link mode and its DC gain of VLC. Furthermore ,we propose use orthogonal frequency pision multiplexing modulation (OFDM)to eliminate inter-symbol interference(ISI).We discuss the characteristics of white LED ,the distribution of indoor lighting. Finally, we mainly analyze the light emitting and receiving technology; include the principle of drive circuit. After comprehended the internal structure of optical receiver, we design a Fresnel lens to replace the common lens to improve the optical concentrator.
Key words : Indoor visible light communication White LED OFDM Distribution of lighting Fresnel lens
目 次
1 绪论 1
1.1 基于白光LED室内可见光通信系统研究背景 1
1.3 论文研究主要内容 3
1.4 论文的章节安排 4
2 室内可见光通信系统整体结构 5
2.1 光源 5
2.2 无线集线器 5
2.3 无线适配器 6
2.4 光码分多址技术(OCDMA) 7
2.5 本章小结 7
3 室内可见光通信信道分析 8
3.1 信道模型 8
3.2室内可见光的链路 10
3.3 两种光传输信道 10
3.3.1 两种光传输信道的概念 10
3.3.2两种光传输信道的直流增益 12
3.4 信道的传播特征