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基于白光LED的室内可见光通信系统研究

发布时间:2018-03-23 23:12

  本文选题:白光LED 切入点:室内模型 出处:《哈尔滨工程大学》2014年硕士论文


【摘要】:随着云技术及移动通信技术的高速发展,用户对通信的带宽及质量要求越来越高。与此同时,白光LED以其辐射能量高,功耗低,使用寿命长,可靠性高等特点被认为是未来取代白炽灯和荧光灯的下一代照明光源,同时由于白光LED具有高速调制的特性,因而使得利用其实现高速数据通信成为可能。本论文主要对基于白光LED的室内可见光通信系统进行了研究。首先对白光LED的组成结构和发光原理作了简要介绍,然后重点对其为满足照明和通信功能的发光特性和调制特性作了比较深入的讨论。接着建立了室内可见光通信系统模型,通过数值优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优良性能最新的LED进行了建模仿真,然后在这个模型下对照明度、接收功率、均方时延以及室内信噪比分布进行了仿真,验证了模型的可行性。并通过与之前采用性能一般的LED所建立模型对比,验证了采用最新的LED可以全面提高系统的性能。然后研究了光通信中几种常见的调制方式,在这几种调制方式的基础上本文提出了一种新的调制方式,即数字脉冲周期调制(DPCM),接着从发射功率、码元长度、传输速率、码间干扰以及误码率等角度将DPCM调制和常用的调制方式进行了比较,通过比较分析了这种调制方式的优缺点及应用在室内可见光通信系统中的优势,为其在实际中的应用奠定了理论基础。最后我们介绍了 DPCM调制的FPGA实现原理,使用QuartusII软件对DPCM调制方式进行了 FPGA仿真,正确的进行了调制和解调,验证了这种调制方式硬件实现的可行性,为建立实际的系统做好了基础工作。本文研究了室内可见光通信系统的相关技术,使用最新的高性能的LED建立了室内可见光通信系统模型,验证了模型的可行性,提出了一种新的调制方式,通过比较验证了其优势,并进行了硬件仿真,为建立实际的应用系统奠定了基础。
[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.
【学位授予单位】:哈尔滨工程大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN929.1

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