【摘要】：白光LED以其體積小、價格低、無電磁輻射和無污染等優(yōu)點(diǎn)在生活中發(fā)揮著重要作用。因此采用白光LED作為室內(nèi)光通信的光源是一個可行又新奇的思路,引起了越來越多研究人員的關(guān)注。本文首先提出采用白光LED作為室內(nèi)可見光通信光源的思路,即白光LED室內(nèi)可見光通信,并與紅外光通信和射頻通信進(jìn)行對比。然后分析了白光LED可見光通信的應(yīng)用領(lǐng)域和目前室內(nèi)白光LED通信技術(shù)的研究趨勢。最后我們詳細(xì)的整理了國內(nèi)外相關(guān)的文獻(xiàn),掌握了國內(nèi)外的發(fā)展現(xiàn)狀。通過詳細(xì)的分析白光LED的發(fā)光原理及工作特性,確定采用光強(qiáng)度調(diào)制-直接探測的方案來實現(xiàn)白光LED室內(nèi)可見光通信系統(tǒng)。本室內(nèi)白光LED可見光通信系統(tǒng)包括發(fā)射機(jī)和接收機(jī)兩部分。采用FPGA實現(xiàn)基帶數(shù)字信號的OFDM調(diào)制,數(shù)模轉(zhuǎn)換器將OFDM調(diào)制信號轉(zhuǎn)換為模擬信號,通過LED驅(qū)動電路轉(zhuǎn)變?yōu)殡娏餍盘柤虞d在白光LED上,使白光LED的光強(qiáng)度隨著電流信號的變化而線性變化,完成了電光轉(zhuǎn)換過程,這就是發(fā)射機(jī)的功能;接收機(jī)用來實現(xiàn)光電轉(zhuǎn)換,即信號的解調(diào),包括光電檢測電路模塊、后置放大電路模塊和低通濾波器設(shè)計、模數(shù)轉(zhuǎn)換模塊。其中,光電檢測電路模塊實現(xiàn)光信號轉(zhuǎn)換為電流信號,后置放大電路將電流轉(zhuǎn)換為電壓并放大,低通濾波電路濾除電壓信號中的毛刺和噪聲�？傊�,白光LED室內(nèi)可見光通信系統(tǒng)就是實現(xiàn)電-光-電的轉(zhuǎn)換過程。文章最后將發(fā)射機(jī)電路和接收機(jī)電路的各個模塊分別集成到單板上,對各個模塊進(jìn)行分析和調(diào)試,并對發(fā)射機(jī)和接收機(jī)進(jìn)行整體的調(diào)試,驗證了采用白光LED實現(xiàn)光通信是一個正確的思路。
[Abstract]:White LED plays an important role in life because of its small size, low price, no electromagnetic radiation and no pollution. Therefore, using white LED as a light source for indoor optical communication is a feasible and novel idea, which has attracted more and more researchers' attention. In this paper, the idea of using white LED as the light source of indoor visible light communication, namely, white light LED indoor visible light communication, is put forward, and compared with infrared light communication and radio frequency communication. Then, the application field of white LED visible light communication and the research trend of indoor white light LED communication technology are analyzed. Finally, we collate the relevant literature at home and abroad in detail, grasp the current situation of development at home and abroad. Based on the detailed analysis of the luminescence principle and working characteristics of white LED, the scheme of light intensity modulation-direct detection is adopted to realize the visible light communication system in white light LED. The indoor white LED visible light communication system consists of transmitter and receiver. The OFDM modulation of baseband digital signal is realized by FPGA, and the OFDM modulation signal is converted into analog signal by digital-to-analog converter, and the current signal is changed into current signal by LED driving circuit, which is loaded on white light LED. The light intensity of white light LED changes linearly with the change of current signal, which completes the process of electro-optic conversion, which is the function of transmitter, and the receiver is used to realize photoelectric conversion, that is, demodulation of signal, including the module of photoelectric detection circuit. Post amplifier circuit module and low-pass filter design, A-D conversion module. The photoelectric detection circuit module converts the optical signal to the current signal, the post-amplifier circuit converts the current to the voltage and amplifies the current, and the low-pass filter circuit filters the burr and noise in the voltage signal. In a word, the white light LED indoor visible light communication system is to realize the electric-optical-electric conversion process. Finally, each module of transmitter circuit and receiver circuit is integrated into single board, each module is analyzed and debugged, and the transmitter and receiver are debugged as a whole. It is verified that using white LED to realize optical communication is a correct idea.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 丁德強(qiáng);柯熙政;;一種通用白光LED數(shù)學(xué)發(fā)光模型研究[J];光學(xué)學(xué)報;2010年09期

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本文編號：2215224