本文選題：可見光通信　切入點(diǎn)：白光LED　出處：《華北電力大學(xué)(北京)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：可見光通信(Visible Light Communication,簡(jiǎn)稱VLC)是基于白光LED新興的一種無(wú)線光通信技術(shù)。通常分為：室內(nèi)可見光通信和室外可見光通信。VLC技術(shù)有很多優(yōu)點(diǎn),它可以解決射頻(Radio Frequency, RF)通信快速發(fā)展導(dǎo)致的頻譜資源短缺問(wèn)題,還可應(yīng)用于射頻信號(hào)不能到達(dá)或使用受限的環(huán)境中,滿足人們特定的通信需求。調(diào)頻(Frequency Modulation)廣播自出世就受到各國(guó)的重視和廣泛的應(yīng)用,技術(shù)日益成熟。調(diào)頻廣播利用高頻電磁波將信號(hào)發(fā)射出去,覆蓋范圍廣、設(shè)備簡(jiǎn)單,但目前面臨一些問(wèn)題。例如接收容易受到其他設(shè)備的電磁干擾、高大建筑物的電磁屏蔽、醫(yī)院和飛機(jī)等環(huán)境使用受限等。針對(duì)以上問(wèn)題,本文給出了基于可見光通信的解決方法。本文主要在學(xué)習(xí)白光LED的物理特性和調(diào)制特性的基礎(chǔ)上,利用光載波調(diào)制方式,建立室內(nèi)光載FM廣播通信系統(tǒng),在提供照明的同時(shí)實(shí)現(xiàn)室內(nèi)FM廣播通信。在信道通信鏈路和信道建模研究的基礎(chǔ)上,分析了室內(nèi)照度分布。論文研究的一個(gè)創(chuàng)新點(diǎn)是提出LED非線性對(duì)FM廣播信號(hào)的影響,通過(guò)實(shí)驗(yàn)數(shù)據(jù)測(cè)量出LED輸入電流和輸出光功率的非線性曲線擬合出傳輸函數(shù),首次給出了LED非線性對(duì)光載FM廣播信號(hào)的理論分析。本文給出的可見光載FM廣播可以充分利用現(xiàn)有調(diào)頻廣播設(shè)備,利用可見光通信本身的優(yōu)點(diǎn),克服射頻廣播的電磁干擾和使用受限等缺點(diǎn)進(jìn)行室內(nèi)通信。基于系統(tǒng)設(shè)計(jì)、理論分析和計(jì)算機(jī)軟件MATLAB對(duì)系統(tǒng)進(jìn)行仿真和論證,得出調(diào)頻指數(shù)和調(diào)制指數(shù)對(duì)載噪比和信噪比的影響程度和此系統(tǒng)更適合傳輸寬帶調(diào)頻信號(hào)的結(jié)論。最后在實(shí)驗(yàn)室的環(huán)境下,搭建了基于白光LED的室內(nèi)可見光載FM調(diào)頻廣播通信系統(tǒng)實(shí)驗(yàn)平臺(tái),通過(guò)實(shí)驗(yàn)論證系統(tǒng)可行性。
[Abstract]:Visible Light Communication (VLC) is a new wireless optical communication technology based on white light LED. It can solve the problem of spectrum resource shortage caused by the rapid development of radio frequency frequency (RF) communication, and it can also be applied in the environment where radio frequency signal can not reach or use is limited. To meet the specific communication needs of people, FM Frequency Modulation (FM) broadcasting has been paid attention to and widely used in many countries since its birth, and the technology is becoming more and more mature. FM broadcasting uses high frequency electromagnetic waves to transmit signals, which has a wide range of coverage and simple equipment. But at present there are some problems. For example, the reception is vulnerable to electromagnetic interference from other equipment, the electromagnetic shielding of tall buildings, the restriction of environmental use such as hospitals and aircraft, etc. In view of the above problems, This paper presents a solution based on visible light communication. Based on the study of the physical and modulation characteristics of white light LED, an indoor optical FM broadcast communication system is established by means of optical carrier modulation. The indoor FM broadcast communication is realized while providing illumination. Based on the research of channel communication link and channel modeling, the indoor illumination distribution is analyzed. One innovation of this paper is to propose the influence of LED nonlinearity on FM broadcast signal. The nonlinear curves of the input current and output optical power of LED are measured by experimental data to fit the transfer function. The theoretical analysis of LED nonlinear FM broadcasting signal is presented for the first time. The visible light FM broadcast can make full use of the existing FM broadcasting equipment and make use of the advantages of visible light communication. The system is simulated and demonstrated based on system design, theoretical analysis and computer software MATLAB. The influence of FM index and modulation index on carrier noise ratio and signal-to-noise ratio and the conclusion that this system is more suitable for transmitting wideband FM signal are obtained. Finally, in the laboratory environment, The experiment platform of indoor visible FM broadcasting communication system based on white light LED is built, and the feasibility of the system is proved by experiment.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.1;TN934.2

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本文編號(hào)：1637762