室内VLC多用户网络模型及其网络策略

发布时间：2018-04-19 23:20

本文选题：VLC + 网络策略　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：目前,关于固态发光二极管(LED)材料和设备方面的研究取得了一定进展,这预示LED将成为未来主要的照明光源。由于具有大容量、免频谱申请、抗电磁干扰、安全性高,低成本等优势,使得基于LED的可见光通信吸引了越来越多的注意。为了建立室内可见光网络,我们需要提出合理的全双工通信方式。一些学者提出使用红外通信作为上行链路来避免上下行链路之间的相互干扰。这对于用户不多的情况可能适用,但对于多用户(尤其是动态用户)的室内可见光网络,用户之间的接入干扰,用户自身下行可见光链路的接收干扰将会更加明显。在本文中,为解决全双工通信质量和多用户网络构建的关键问题,我们重点研究了室内可见光网络模型和网络策略。首先,为了充分利用红外频谱资源和消除多用户之间红外链路的相互干扰,我们提出“多波长-空间管理”方案来管理室内移动用户。方案规定了用户链路管理准则,即用户的上行链路由波长匹配的LED终端管理,下行链路由所在VLC区域的终端管理。其次,我们设计了多收发照明/通信终端模型,在终端各个方向上集成了一定数量相同波长的红外接收器。因为终端的尺寸大小限制,所有适用的红外波长接收器被集成若干个终端上。同时,我们设计了合理的多终端的拓扑结构,以达到照明均匀和消除用户接收干扰(或消除照明重叠区域)的目的。再次,我们提出基于CSMA/CA技术的改进方法以提高可见光带宽利用率和消除多用户接入干扰。基于上述理论,我们给出了多用户接入策略和用户之间建立连接策略。同时,我们也呈现了在接入碰撞概率,吞吐量,用户接入网络时间和用户建立连接时间方面的网络性能。最后,我们进行了数值仿真,结果显示我们提出的网络方案和路由策略在室内多用户可见光网络中是适用的和可行的。
[Abstract]:At present, some progress has been made in the research of solid-state light-emitting diode (LED) materials and devices, which indicates that LED will become the main lighting source in the future. Due to the advantages of large capacity, spectrum free, anti-electromagnetic interference, high security and low cost, visible light communication based on LED attracts more and more attention. In order to establish indoor visible light network, we need to propose a reasonable mode of full duplex communication. Some scholars propose to use infrared communication as uplink to avoid interference between uplink and downlink. This may be applicable to the situation where there are not many users, but for the indoor visible light networks with multiple users (especially dynamic users), the interference between the users and the reception interference of the users' own downlink visible light link will be more obvious. In this paper, in order to solve the key problems of full-duplex communication quality and multi-user network construction, we focus on the indoor visible light network model and network strategy. Firstly, in order to make full use of the infrared spectrum resources and eliminate the interferences between multiple users, we propose a multi-wavelength space management scheme to manage indoor mobile users. The scheme provides the user link management criteria, that is, the uplink of the user is managed by the wavelength matched LED terminal, and the downlink is managed by the terminal in the VLC region. Secondly, we design a multi-transceiver illumination / communication terminal model and integrate a certain number of infrared receivers with the same wavelength in each direction of the terminal. Due to the size of the terminal, all applicable infrared wavelength receivers are integrated into several terminals. At the same time, we design a reasonable topology of multi-terminal to achieve the goal of uniform illumination and eliminating user interference (or overlapping area of illumination). Thirdly, we propose an improved method based on CSMA/CA technology to improve the utilization of visible light bandwidth and eliminate multi-user access interference. Based on the above theory, we present a multi-user access strategy and a user-to-user connection strategy. At the same time, we also present the network performance in terms of access collision probability, throughput, user access time and user setup time. Finally, numerical simulation results show that the proposed network scheme and routing strategy are applicable and feasible in indoor multi-user visible light networks.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1

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