Matlab白光LED可见光通信系统研究仿真

摘要可见光通信技术是一种在白光LED发明及应用后发展起来的新兴的无线光通信技术。LED不仅可以提供室内照明，而且可以应用到无线光通信系统中满足室内个人网络需求。论文主要对基于白光LED的室内可见光通信系统进行了研究。
本文在对白光LED用作通信光源时的伏安特性和调制特性等物理特性做深入分析的基础上，重点研究了白光LED照明光源通信系统的组成结构，并给出了白光LED调制和发射电路。给出了一种求LED照明灯室内布局的方法，该方法可以较好地解决可见光通信系统的室内LED照明灯的最优布局问题。
本文引入了一种基于正交频分复用（OFDM）调制与解调的方案，用于减弱高速通信时由多径效应带来的码间串扰，并在Matlab环境下对白光LED室内通信系统接收端的接收功率、信噪比、误码率的关系进行仿真，验证其在白光LED室内通信系统中的抗干扰作用,说明OFDM适合白光LED可见光通信系统。9170
关键词：室内可见光通信白光LED   正交频分复用
毕业设计说明书（论文）外文摘要
Title Visible light communication System based on White LED
Abstract
Visible light communication is a new wireless optical communication technology and is rose with development of white LED fabrication techniques. White LED devices are used not only for illuminating rooms but also for an optical wireless communication system which is suitable for indoor private networks. It is proposed in the thesis that a receiving and transmitting link for indoor visible light communication system based on white LED lights .
In the thesis, basic studies have been done on voltage to current characteristic and modulation property of white LED when they are used as optical transmitters. Then the configuration and systematic design techniques are concentrated concerning white LED lighting source communication as well as high speed modulation techniques, visible light transceiver circuit. An optical design of lightings layout of the visible light communication system is discussed.
Because of the inherent robustness of OFDM(Orthogonal Frequency Division Multiplexing) against intersymbol interference, OFDM is considered in combination with higher order modulation schemes in the thesis. The relationship of optical power , SNR and BER of the receiver system.Is simulated based on Matlab. In conclusion,the results of computer simulation show that OFDM is good for the Indoor visible light communication systems.
Keywords：Indoor visible light communication   White LED    OFDM
目     次
1 绪论   1
1.1白光LED室内通信系统概述   1
1.2国内外研究现状   3
1.3本文研究主要内容   6
2白光LED可见光通信系统传输链路、收发电路研究   7
2.1室内光传输链路   7
2.2室内可见光发射电路   8
2.3室内可见光接收电路及接收数据分析   10
3 LED结构原理特性及系统灯光布局   14
3.1 LED结构和发光原理   14
3.2 LED的调制特性   16
3.3 灯光布局   17
4 正交频分复用在可见光通信系统中的应用   20
4.1 正交频分复用（OFDM）基本原理   20
4.2 OFDM在室内可见光通信中的Matlab仿真分析   22
5总结和展望   25
5.1 总结   25
5.2 展望   25
致谢   27
参考文献   28
1 绪论
1.1白光LED室内通信系统概述
    现代通信系统主要利用电磁波进行无线或有线通信，在光类无线通信中的应用较少。无线光通信技术与射频无线通信相比．有无需频带申请、造价低等许多优点。白光LED可见光通信系统是光类无线通信系统的一种，是一种的新型光类无线通信系统。 Matlab白光LED可见光通信系统研究仿真:http://www.youerw.com/tongxin/lunwen_7798.html