發(fā)布時(shí)間：2018-08-16 10:10

【摘要】：LED自由空間光通信技術(shù)(LED based free space optical communication,簡(jiǎn)稱LED FSO)是一種以LED作為傳輸載體的無(wú)線光通信技術(shù)。在LED FSO系統(tǒng)中,信號(hào)以直接強(qiáng)度調(diào)制的方式調(diào)制LED光強(qiáng)并通過(guò)光學(xué)發(fā)射天線發(fā)送至自由空間光通信信道中。本文從系統(tǒng)實(shí)現(xiàn)和性能研究的角度出發(fā),對(duì)LED自由空間光通信這種新興的無(wú)線光通信技術(shù)展開研究。針對(duì)成像LED自由空間光通信技術(shù),研究了單輸入單輸出方式下基于圖像處理技術(shù)的解調(diào)算法;為了提升系統(tǒng)整體性能,提出了基于多輸入多輸出(Multi-input Multi-output,簡(jiǎn)稱MIMO)技術(shù)的解調(diào)算法,并分析了成像系統(tǒng)中雜散光對(duì)通信性能的影響。針對(duì)非成像LED自由空間光通信技術(shù),研究了大功率LED驅(qū)動(dòng)電路和信號(hào)接收處理電路的設(shè)計(jì),以實(shí)現(xiàn)系統(tǒng)遠(yuǎn)距離通信的應(yīng)用;介紹了系統(tǒng)的整體設(shè)計(jì)與實(shí)現(xiàn),研究了光學(xué)系統(tǒng)的能量計(jì)算,在外場(chǎng)實(shí)驗(yàn)的基礎(chǔ)上對(duì)系統(tǒng)整體性能作出了進(jìn)一步的分析。針對(duì)LED的非線性對(duì)系統(tǒng)性能的影響,研究了非線性的產(chǎn)生機(jī)理,提出了基于高斯函數(shù)的非線性模型,并在此基礎(chǔ)上提出一種預(yù)失真算法,達(dá)到了減輕LED非線性影響、提升系統(tǒng)性能的目的。
[Abstract]:LED free space optical communication technology (LED based free space optical communication, is a wireless optical communication technology based on LED. In LED FSO system, the signal modulates the intensity of LED in a direct intensity modulation mode and transmits it to the free space optical communication channel via an optical transmitting antenna. From the point of view of system implementation and performance research, this paper studies the LED free space optical communication, a new wireless optical communication technology. Aiming at the imaging LED free space optical communication technology, the demodulation algorithm based on image processing technology in single input and single output mode is studied, and in order to improve the overall performance of the system, a demodulation algorithm based on Multi-input Multi-Output (MIMO) technology is proposed. The effect of stray light on communication performance in imaging system is analyzed. Aiming at the non-imaging LED free-space optical communication technology, the design of high-power LED driving circuit and signal receiving and processing circuit is studied to realize the application of remote communication, and the whole design and implementation of the system are introduced. The energy calculation of the optical system is studied, and the overall performance of the system is further analyzed on the basis of the field experiments. Aiming at the influence of LED nonlinearity on the system performance, the mechanism of nonlinear generation is studied, and a nonlinear model based on Gao Si function is proposed. Based on this, a predistortion algorithm is proposed, which can reduce the nonlinear effect of LED. The purpose of improving system performance.
【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】：2017
【分類號(hào)】：TN929.1

【參考文獻(xiàn)】

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本文編號(hào)：2185666