【摘要】：隨著人們對(duì)寬帶移動(dòng)通信需求的日益增長(zhǎng)和全光通信技術(shù)的發(fā)展,無(wú)線光通信技術(shù)(Wireless Optical Communication)因其無(wú)需頻帶申請(qǐng)、信息容量大、造價(jià)低、靈活方便、易于維護(hù)等特點(diǎn)受到人們的極大關(guān)注。它是一種以光信號(hào)為信息載體、大氣作為信息傳輸媒質(zhì)來(lái)傳送光信號(hào)的寬帶無(wú)線接入技術(shù),其結(jié)合了無(wú)線通信技術(shù)(Wireless Communication)和光通信技術(shù)(Communication)。進(jìn)入20世紀(jì)以來(lái),半導(dǎo)體照明技術(shù)發(fā)展迅猛,它具有穩(wěn)定性高、壽命長(zhǎng)、光效高、安全性好、功耗低、綠色環(huán)保、抗震、可靠耐用等特點(diǎn),成為新一代的照明光源。又因?yàn)槠漤憫?yīng)時(shí)間短、高速的發(fā)光響應(yīng)和調(diào)制的特性,可作為光通信系統(tǒng)的光源。德國(guó)的物理學(xué)家哈拉爾德·哈斯和其英國(guó)愛(ài)丁堡大學(xué)的團(tuán)隊(duì)利用LED光源發(fā)明了一種專利技術(shù)：“看不見(jiàn)”的網(wǎng)絡(luò)信號(hào)依賴一盞小小的燈變成“看得見(jiàn)”的網(wǎng)絡(luò)信號(hào),利用閃爍的燈光來(lái)傳輸數(shù)字信息。這個(gè)過(guò)程被稱為可見(jiàn)光通信技術(shù),人們親切地稱它為"Lifi". 本論文設(shè)計(jì)了一種室內(nèi)LED可見(jiàn)光通信系統(tǒng)。該系統(tǒng)利用LED作為通信光源,通過(guò)串口將發(fā)射端電腦的信源信息傳送到STM32,進(jìn)行信源調(diào)制。調(diào)制后的電信號(hào)驅(qū)動(dòng)LED發(fā)出人們?nèi)庋塾X(jué)察不出來(lái)的高速變換的光信號(hào)。光信號(hào)經(jīng)過(guò)自由空間傳輸后,通過(guò)菲涅爾透鏡聚光和藍(lán)色濾光片過(guò)濾投射到光電探測(cè)器上。光信號(hào)被光電探測(cè)器接收轉(zhuǎn)換得到電信號(hào),經(jīng)過(guò)均衡、判決和解碼等過(guò)程還原出信息,傳到接收端的電腦上,從而完成數(shù)據(jù)的傳輸。本論文首先對(duì)室內(nèi)LED可見(jiàn)光通信技術(shù)進(jìn)行了原理分析,特別是對(duì)室內(nèi)LED可見(jiàn)光通信系統(tǒng)信道進(jìn)行了深入分析,包括LED的光源特性、通信鏈路和信道分析。在此基礎(chǔ)上,設(shè)計(jì)了系統(tǒng)的總體方案,完成了數(shù)據(jù)的串口通信部分、功率放大部分、驅(qū)動(dòng)電路部分、接收機(jī)部分的設(shè)計(jì)和實(shí)現(xiàn)。
[Abstract]:With the increasing demand for broadband mobile communication and the development of all-optical communication technology, wireless optical communication technology (Wireless Optical Communication), because of its large information capacity, low cost, flexibility and convenience, is not required to apply for frequency band. People pay great attention to the characteristics of easy maintenance. It is a broadband wireless access technology which uses optical signal as information carrier and atmosphere as information transmission medium to transmit optical signal. It combines wireless communication technology (Wireless Communication) and optical communication technology (Communication). Since the 20th century, semiconductor lighting technology has developed rapidly. It has the characteristics of high stability, long life, high light efficiency, good security, low power consumption, green environmental protection, earthquake resistance, reliability and durability. Because of its short response time, high-speed luminous response and modulation, it can be used as the light source of optical communication system. Harald Haas, a German physicist, and his team at the University of Edinburgh in the UK have developed a patented technology using LED light sources: "invisible" network signals rely on a small lamp to become "visible" online signals. Use flashing lights to transmit digital information. This process is called visible light communication technology and is affectionately referred to as "Lifi". In this paper, an indoor LED visible light communication system is designed. The system uses LED as the communication light source and transmits the source information of the transmitter computer to STM32, through serial port for source modulation. The modulated signal drives the LED to emit a high-speed converted optical signal that is invisible to the naked eye. The optical signal is transmitted through free space and projected onto the photodetector through Fresnel lens and blue filter. The optical signal is received and converted by the photodetector to obtain the electrical signal. After equalization, decision and decoding, the information is restored to the computer at the receiving end, and the data is transmitted to the computer. In this paper, the principle of indoor LED visible light communication technology is analyzed, especially the channel of indoor LED visible light communication system, including the light source characteristic, communication link and channel analysis of LED. On this basis, the overall scheme of the system is designed, the serial communication part of the data, the power amplifier part, the driving circuit part and the receiver part are designed and implemented.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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