基于可见光通信和无线局域网联合的上下行传输切换方案研究与实现

发布时间：2018-06-24 16:24

本文选题：可见光通信 + 无线局域网　；参考：《南京邮电大学》2017年硕士论文

【摘要】：可见光通信(VLC)采用白光LED作为光源,具有无需授权的较高带宽,可在无线射频(RF)敏感的环境中使用,是室内短距无线接入的重要解决方案之一。在实际的网络应用中,上行链路传输方案还面临许多问题,无线局域网(如WiFi)提供了较大范围的覆盖区域,可有效补充VLC受视距传输(LOS)的限制。论文针对典型室内无线接入应用环境中的VLC+WiFi异构融合网络进行了研究。论文首先简述了VLC系统原理和关键技术,包括白光LED及其工作特性、室内信道传输特性等。然后详细分析了基于VLC+WiFi协同的室内无线接入网,对双向链路传输方案、组网方式及切换策略等进行了深入研究,分析得出了基于VLC和WiFi异构组网的切换策略以及布局方案。论文提出了一种等价信噪比切换算法。改进算法根据WiFi信噪比与VLC等价信噪比间的差值与设定切换门限的对比结果进行切换触发,使切换算法能精确感知并比较不同传输方式的性能;同时引入了驻网定时器机制,进行判决切换的短暂保持,以保证判决的准确性。论文最后针对可见光通信与无线局域网技术联合光源端收发机和移动端收发机进行了设计,设计实现了Demo系统,实际切换测试验证了设计方案的可行性。
[Abstract]:Visible light communication (VLC), which uses white LED as light source, has high bandwidth without authorization and can be used in radio frequency (RF) sensitive environment. It is one of the most important solutions for indoor short-range wireless access. In practical network applications, uplink transmission schemes also face many problems. Wireless local area networks (WLAN), such as WiFi, provide a wide range of coverage areas, which can effectively supplement VLC with the limitation of line-of-sight transmission (Los). This paper studies the VLC WiFi heterogeneous fusion network in the typical indoor wireless access application environment. Firstly, the principle and key technologies of VLC system are briefly introduced, including white LED and its working characteristics, indoor channel transmission characteristics and so on. Then, the indoor wireless access network based on VLC WiFi collaboration is analyzed in detail, and the two-way link transmission scheme, networking mode and handover strategy are deeply studied, and the handover strategy and layout scheme based on VLC and WiFi heterogeneous network are obtained. In this paper, an equivalent signal-to-noise ratio switching algorithm is proposed. By comparing the difference between WiFi signal-to-noise ratio (SNR) and VLC equivalent signal-to-noise ratio (VLC) and setting the switching threshold, the improved algorithm can accurately perceive and compare the performance of different transmission modes. Make a short stay of the decision switch to ensure the accuracy of the decision. In the end, the paper designs the transceiver and transceiver on the mobile side and the transceiver on the combination of visible light communication and wireless local area network technology. The Demo system is designed and realized. The feasibility of the design is verified by the actual switch test.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92;TN929.1

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