本文關(guān)鍵詞： 可見光通信 OOK調(diào)制 PPM調(diào)制 無線語音通信　出處：《大連海事大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著計算機的普及和智能設(shè)備的發(fā)展,無線接入網(wǎng)頻譜資源越來越緊張,光纖到戶面臨著“最后一公里”的困境。為此,尋求新型寬帶接入技術(shù)便成為無線通信領(lǐng)域的研究熱點�？梢姽馔ㄐ�(Visible Light Communication, VLC)技術(shù)采用第四代環(huán)保節(jié)能照明LED作為光源,利用其發(fā)出的高速明暗變化的信號傳輸信息,在照明的同時仍能通信,是一種可以拓寬頻譜資源、綠色節(jié)能、可移動的接入方式,推動了下一代照明和接入網(wǎng)的發(fā)展與技術(shù)進步,已經(jīng)引起國內(nèi)外的廣泛關(guān)注。 論文首先概述了VLC技術(shù)研究的國內(nèi)外進展情況,并對VLC技術(shù)特性及應用進行了描述。其次,介紹了VLC無線數(shù)據(jù)傳輸物理模型,并對室內(nèi)通信鏈路結(jié)構(gòu)及直射鏈路信道特性進行了詳細的分析。分別提出了基于開關(guān)鍵控(On-Off Keying, OOK)調(diào)制和脈沖位置調(diào)制(Pulse Position Modulation, PPM)的VLC系統(tǒng)的設(shè)計實現(xiàn)方案,具體包括通信協(xié)議、硬件電路、微控制器軟件程序等的設(shè)計。其中,OOK調(diào)制系統(tǒng)最終實現(xiàn)了通信速率為14.4kbps.通信距離為2米的語音及文本傳輸功能；基于JEITA-CP1222通信協(xié)議的4PPM調(diào)制系統(tǒng)實現(xiàn)了協(xié)議規(guī)定的4.8kbps的通信速率,并能夠在正常照明環(huán)境下實現(xiàn)通信距離為3米的本文數(shù)據(jù)傳輸功能。論文針對所實現(xiàn)的系統(tǒng)進行了實驗測試,給出了兩種系統(tǒng)在不同通信距離、不同通信角度、不同背景噪聲和不同發(fā)射功率下的通信性能實驗結(jié)果,并進行了詳細分析,驗證了系統(tǒng)設(shè)計方案的可行性及有效性。此外,論文還提出了一種基于MATLAB控制PC機聲卡進行語音數(shù)據(jù)采集和播放的可見光語音通信系統(tǒng)設(shè)計方法,實驗驗證表明系統(tǒng)能夠?qū)崿F(xiàn)正常的無線語音通信。 本論文研究了可見光OOK調(diào)制系統(tǒng)、PPM調(diào)制系統(tǒng)的設(shè)計方法,初步實現(xiàn)了可見光無線語音通信功能,為進一步進行可見光通信應用的研究提供了一定的理論依據(jù)和實驗基礎(chǔ)。
[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.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM923.34;TN92

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本文編號：1495990