室内可见光通信系统研究光源最优布局及OOK调制方式
毕业论文关键词 白光 LED 可见光通信 OOK 调制编码
Title The research in the indoor visible light wireless communication system
Abstract Recently，the indoor visible light wireless communications technology is emerged companied with the blooming white light-emitting diode(LED) lighting technology．Thanks to the white LED's excellent properties such as low power consumption， long lifetime， high reliability and short response time，it is possible to upgrade the indoor white LED illumination source to a wireless optical communication system. Analyzed and compared domestic and foreign , indoor and outdoor visible light communication Technology history, current situation and trends，the dissertation discussed the key technologies of communication system based on white LED array light source. We do a in-depth analysis on white LED's structure and lighting principle, including its physical characteristics when used as a communication source. Then we build a model to calculate the luminosity distribution of the white LED light source，and then find out the best lighting layout of white LEDs through numerical simulate．Finally, the OOK modulation encoding mode is chosen to do a feasibility study. By using system view to simulate, it was carried out that that the OOK modulation coding mode can do pretty well in visible light communication in low-speed transmission.
Keywords white LED visible light communication the OOK modulation coding mode
目次
1绪论1
1.1光通信系统概述.1
1.2几种无线光通信的比较.1
1.3本论文的主要内容.5
2室内可见光通信系统6
2.1室内VLC系统的组成.6
2.2LED可见光通信关键技术7
2.3可见光通信的国内外研究发展动态.8
3LED工作特性和布局设计13
3.1白光LED发光原理.13
3.2白光LED工作特性.14
3.3室内灯光布局.18
4室内可见光通信OOK调制方式研究.28
4.1OOK调制编码28
4.2OOK信道编码性能分析34
结论38
致谢39
参考文献.40
1 绪论 20 世纪90 年代后期，人们对无线宽带通信速度的要求越来越高，全光接入技术日新月异,一种信息储量大、操作灵活、修理方便、安全性突出的无线光通信技术，逐渐被人们接受。它为无线宽带接入的结构布局供应了一种较好的解决方案，其使用范围不仅涉及军用和航天领域，更扩展到民用领域。 最近几年，半导体(LED)照明技术日新月异。由于半导体(LED)器件具有高速点灭的发光响应特性，将信号调制到 LED 可见光上进行传输，使可见光通信与LED 照明相结合构建出LED 照明和通信两用灯，为光通信提供一种全新的宽带接入方式[1]。无线 LED 光通信是以大气作为传输媒质来进行光信号传送的，只需在收发端之间存在无遮挡的视距路径和足够的光发射功率。