本文選題：白光LED　切入點：室內模型　出處：《哈爾濱工程大學》2014年碩士論文

【摘要】：隨著云技術及移動通信技術的高速發(fā)展,用戶對通信的帶寬及質量要求越來越高。與此同時,白光LED以其輻射能量高,功耗低,使用壽命長,可靠性高等特點被認為是未來取代白熾燈和熒光燈的下一代照明光源,同時由于白光LED具有高速調制的特性,因而使得利用其實現(xiàn)高速數據通信成為可能。本論文主要對基于白光LED的室內可見光通信系統(tǒng)進行了研究。首先對白光LED的組成結構和發(fā)光原理作了簡要介紹,然后重點對其為滿足照明和通信功能的發(fā)光特性和調制特性作了比較深入的討論。接著建立了室內可見光通信系統(tǒng)模型,通過數值優(yōu)化得到了照明光源的最佳布局。然后在最佳布局下采用具有優(yōu)良性能最新的LED進行了建模仿真,然后在這個模型下對照明度、接收功率、均方時延以及室內信噪比分布進行了仿真,驗證了模型的可行性。并通過與之前采用性能一般的LED所建立模型對比,驗證了采用最新的LED可以全面提高系統(tǒng)的性能。然后研究了光通信中幾種常見的調制方式,在這幾種調制方式的基礎上本文提出了一種新的調制方式,即數字脈沖周期調制(DPCM),接著從發(fā)射功率、碼元長度、傳輸速率、碼間干擾以及誤碼率等角度將DPCM調制和常用的調制方式進行了比較,通過比較分析了這種調制方式的優(yōu)缺點及應用在室內可見光通信系統(tǒng)中的優(yōu)勢,為其在實際中的應用奠定了理論基礎。最后我們介紹了 DPCM調制的FPGA實現(xiàn)原理,使用QuartusII軟件對DPCM調制方式進行了 FPGA仿真,正確的進行了調制和解調,驗證了這種調制方式硬件實現(xiàn)的可行性,為建立實際的系統(tǒng)做好了基礎工作。本文研究了室內可見光通信系統(tǒng)的相關技術,使用最新的高性能的LED建立了室內可見光通信系統(tǒng)模型,驗證了模型的可行性,提出了一種新的調制方式,通過比較驗證了其優(yōu)勢,并進行了硬件仿真,為建立實際的應用系統(tǒng)奠定了基礎。
[Abstract]:With the rapid development of cloud technology and mobile communication technology, the bandwidth and quality of communication are becoming more and more demanding by users. At the same time, white LED has high radiation energy, low power consumption and long service life. The characteristics of high reliability are considered to be the next generation of lighting sources to replace incandescent and fluorescent lamps in the future. At the same time, the white LED has the characteristics of high speed modulation. So it is possible to realize high speed data communication by using it. This paper mainly studies the indoor visible light communication system based on white light LED. Firstly, the composition structure and luminous principle of white light LED are introduced briefly. Then, the luminescence and modulation characteristics of the indoor visible light communication system are discussed in detail to satisfy the lighting and communication functions. Then, the model of indoor visible light communication system is established. The optimal layout of the illumination source is obtained by numerical optimization. Then the LED with excellent performance is used to model and simulate, and then the illumination and the receiving power are obtained under this model. The simulation results of mean square delay and indoor signal-to-noise ratio distribution verify the feasibility of the model. It is verified that the performance of the system can be improved by using the latest LED. Then, several common modulation methods in optical communication are studied, and a new modulation method is proposed based on these modulation methods. That is, digital pulse period modulation (DPCM). Then, the DPCM modulation is compared with the usual modulation methods in terms of transmission power, symbol length, transmission rate, inter-symbol interference and bit error rate. The advantages and disadvantages of this modulation method and its application in indoor visible light communication system are compared and analyzed, which lays a theoretical foundation for its practical application. Finally, we introduce the FPGA realization principle of DPCM modulation. The FPGA simulation of DPCM modulation is carried out by using QuartusII software, and the modulation and demodulation are correctly carried out, which verifies the feasibility of the hardware implementation of this modulation mode. In this paper, the related technologies of indoor visible light communication system are studied, and the model of indoor visible light communication system is established by using the latest high-performance LED, which verifies the feasibility of the model. A new modulation method is proposed, its advantages are verified by comparison, and the hardware simulation is carried out, which lays a foundation for the establishment of practical application system.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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本文編號：1655630