可见光通信系统设计实现与实验研究

发布时间：2018-01-06 22:29

本文关键词：可见光通信系统设计实现与实验研究　出处：《北京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：可见光通信技术采用白光LED作为光源,利用LED发出光波承载高速明暗变化的光信号来传输信息。可见光通信是照明与通信深度结合的一种通信技术,因其巨大频谱带宽,可以缓解无线频谱资源即将耗尽的问题；同时具备射频无线通信的移动、灵活特性和光纤通信的高速、大容量特性,并可以应用于电磁敏感环境或信息安全领域。以上这些特点使其具有重要的研究价值和广泛的应用前景。可见光通信作为一种新兴的无线通信技术尚存在一些关键问题有待解决。本文围绕可见光信道建模、背景噪声滤除及通信系统搭建等问题开展了大量的理论和实验研究,主要研究成果如下： (1)利用多径反射信道模型,通过蒙特卡罗射线追踪法推导得出脉冲响应函数,建立室内可见光通信信道模型。研究结果表明室内多径信道环境下不同波长信号有相似的路径损耗,蓝光波段具有更小的均方时延扩展,绿光波段具有更大的3dB信道带宽。 (2)通过测量和分析室内三种主要背景光噪声同时对比多种数字滤波器性能,选定凯塞窗作为系统数字滤波器。通过实验得到,凯塞窗可以有效滤除系统中的背景光噪声,性能最好情况下系统误码率可以降低一个数量级。 (3)全面研究可见光通信系统各组成器件原理,设计完成LED散热模块、LED光学设计及滤光片。利用选中器件设计完成高速发送模块和高速接收模块,搭建完成可见光通信系统,并成功实现高清视频传输实验。
[Abstract]:Visible light communication technology using white light LED as the light source, the use of LED light wave emitted from the optical signal carrying high-speed brightness change to transmit information. Visible light communication is a combination of lighting and communication depth of communication technology, because of its huge bandwidth, can ease the wireless spectrum resources will be depleted; at the same time with the mobile radio wireless communication high speed, flexible and optical fiber communication, high capability, and can be applied to electromagnetic environment sensitive or the field of information security. These features make it has important research value and broad application prospect.
As a new wireless communication technology, there are still some key problems to be solved. Visible and optical channel modeling, background noise filtering and communication system building have been carried out in a large number of theoretical and experimental studies.
(1) the use of multipath channel model, the tracking method is derived by Monte Carlo ray pulse response function, the establishment of indoor visible light communication channel model. The results show that the indoor multipath environments of different wavelength signals have similar path loss, the blue band has a smaller RMS delay spread, the green band with 3dB bandwidth greater.
(2) through the measurement and analysis of three main types of background noise and indoor light compared to a variety of digital filter, digital filter system as selected Kaiser window. Through the experiments, the Kaiser window can effectively filter out the background noise in the system, the best performance under the condition of the BER can be reduced by an order of magnitude.
(3) a comprehensive study of each component of visible light communication system principle, the design of LED thermal module, LED optical design and filter. Using the selected device design for high speed high-speed transmission module and receiver module, completed the visible light communication system, and the successful implementation of HD video transmission experiment.

【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1

【参考文献】