基于LED的无线数据传输技术研究与设计实现

发布时间：2018-02-08 17:37

本文关键词： 可见光通信 OOK调制 PPM调制无线语音通信　出处：《大连海事大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着计算机的普及和智能设备的发展,无线接入网频谱资源越来越紧张,光纤到户面临着“最后一公里”的困境。为此,寻求新型宽带接入技术便成为无线通信领域的研究热点。可见光通信(Visible Light Communication, VLC)技术采用第四代环保节能照明LED作为光源,利用其发出的高速明暗变化的信号传输信息,在照明的同时仍能通信,是一种可以拓宽频谱资源、绿色节能、可移动的接入方式,推动了下一代照明和接入网的发展与技术进步,已经引起国内外的广泛关注。论文首先概述了VLC技术研究的国内外进展情况,并对VLC技术特性及应用进行了描述。其次,介绍了VLC无线数据传输物理模型,并对室内通信链路结构及直射链路信道特性进行了详细的分析。分别提出了基于开关键控(On-Off Keying, OOK)调制和脉冲位置调制(Pulse Position Modulation, PPM)的VLC系统的设计实现方案,具体包括通信协议、硬件电路、微控制器软件程序等的设计。其中,OOK调制系统最终实现了通信速率为14.4kbps.通信距离为2米的语音及文本传输功能；基于JEITA-CP1222通信协议的4PPM调制系统实现了协议规定的4.8kbps的通信速率,并能够在正常照明环境下实现通信距离为3米的本文数据传输功能。论文针对所实现的系统进行了实验测试,给出了两种系统在不同通信距离、不同通信角度、不同背景噪声和不同发射功率下的通信性能实验结果,并进行了详细分析,验证了系统设计方案的可行性及有效性。此外,论文还提出了一种基于MATLAB控制PC机声卡进行语音数据采集和播放的可见光语音通信系统设计方法,实验验证表明系统能够实现正常的无线语音通信。本论文研究了可见光OOK调制系统、PPM调制系统的设计方法,初步实现了可见光无线语音通信功能,为进一步进行可见光通信应用的研究提供了一定的理论依据和实验基础。
[Abstract]:With the popularization of computers and the development of intelligent devices, the spectrum resources of wireless access network are becoming more and more tight, and the fiber-optic home is facing the dilemma of "last kilometer". Seeking new broadband access technology has become a research hotspot in the field of wireless communication. Visible Light Communication (VLC) technology uses 4th generation environmental protection and energy saving lighting LED as the light source. It is a kind of access mode which can broaden the spectrum resource, save energy and move. It promotes the development of the next generation lighting and access network and the progress of technology. It has attracted wide attention at home and abroad. Firstly, this paper summarizes the development of VLC technology at home and abroad, and describes the characteristics and applications of VLC technology. Secondly, the physical model of VLC wireless data transmission is introduced. The indoor communication link structure and the channel characteristics of direct link are analyzed in detail. The design and implementation of VLC system based on on-Off key modulation and pulse position modulation (PPMM) are presented respectively, including the communication protocol. The design of hardware circuit, software program of microcontroller and so on. Finally, the OOK modulation system realizes the communication rate of 14.4 kbps.The communication distance is 2 meters and the voice and text transmission function is realized. The 4PPM modulation system based on JEITA-CP1222 protocol realizes the communication rate of 4.8 kbps, and can realize the data transmission function of this paper with the communication distance of 3 meters under the normal lighting environment. The experimental results of communication performance of two systems under different communication distances, different communication angles, different background noise and different transmit power are given, and detailed analysis is made to verify the feasibility and effectiveness of the system design. This paper also proposes a design method of the visible light voice communication system based on the MATLAB control PC sound card for voice data acquisition and playback. The experimental results show that the system can realize the normal wireless voice communication. In this paper, the design method of visible light OOK modulation system is studied, and the function of visible light wireless voice communication is preliminarily realized, which provides a certain theoretical basis and experimental basis for further research on the application of visible light communication.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM923.34;TN92

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