【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)點在生活中發(fā)揮著重要作用。因此采用白光LED作為室內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注。本文首先提出采用白光LED作為室內可見光通信光源的思路,即白光LED室內可見光通信,并與紅外光通信和射頻通信進行對比。然后分析了白光LED可見光通信的應用領域和目前室內白光LED通信技術的研究趨勢。最后我們詳細的整理了國內外相關的文獻,掌握了國內外的發(fā)展現(xiàn)狀。通過詳細的分析白光LED的發(fā)光原理及工作特性,確定采用光強度調制-直接探測的方案來實現(xiàn)白光LED室內可見光通信系統(tǒng)。本室內白光LED可見光通信系統(tǒng)包括發(fā)射機和接收機兩部分。采用FPGA實現(xiàn)基帶數(shù)字信號的OFDM調制,數(shù)模轉換器將OFDM調制信號轉換為模擬信號,通過LED驅動電路轉變?yōu)殡娏餍盘柤虞d在白光LED上,使白光LED的光強度隨著電流信號的變化而線性變化,完成了電光轉換過程,這就是發(fā)射機的功能;接收機用來實現(xiàn)光電轉換,即信號的解調,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計、模數(shù)轉換模塊。其中,光電檢測電路模塊實現(xiàn)光信號轉換為電流信號,后置放大電路將電流轉換為電壓并放大,低通濾波電路濾除電壓信號中的毛刺和噪聲�？傊�,白光LED室內可見光通信系統(tǒng)就是實現(xiàn)電-光-電的轉換過程。文章最后將發(fā)射機電路和接收機電路的各個模塊分別集成到單板上,對各個模塊進行分析和調試,并對發(fā)射機和接收機進行整體的調試,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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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相關期刊論文 前1條

1 丁德強;柯熙政;;一種通用白光LED數(shù)學發(fā)光模型研究[J];光學學報;2010年09期

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本文編號：2215224