可见光无线局域网接入技术及仿真实现

发布时间：2018-09-10 05:52

【摘要】：本文分析了国内外对已有的室内无线光网络系统,并针对性的提出了多信道接入策略,在组网中分析了多信道无线光网络的跨层路由协议,用以解决传统的分层结构不适用室内无线光网络组网的实际,提出根据不同信道之间的差异性选择较好的信道用于传输数据的方法,并进行了深入分析;通过对进程信任模型进行仿真,仿真结果表明,该方法在无线光网络组网过程中的信道选择方面具有一定优势。论文主要分为四个部分:(1)分析了室内可见光通信信道的接收信号光功率分布特性,引入Phong模型,通过模型仿真分析发现,与常用的朗伯模型相比,基于Phong模型的仿真分析结果能更准确的反映室内光功率的强度分布特性;针对实际室内照明环境,研究了多光源情况下基于Phong模型的室内可见光信道冲激响应;在此基础上,以OOK调制为例对不同传输速率下的室内多径噪声进行了分析和仿真。(2)对白光LED发光原理和调制特性进行了分析,设计实现了LED的发送和接收电路,测试了目前市场上多种LED在不同调制度下的调制带宽,根据LED频响特性,设计了均衡电路,提高了系统带宽;测试研究了可见光通信系统的环境噪声及干扰。(3)基于制约可见光通信系统性能的因素考虑,主要包括多径噪声带来的码间串扰,背景光噪声带来的干扰,以及LED调制带宽限制等因素,对OOK、PPM、OFDM三种无线光调制技术在实际可见光通信系统中的性能进行分析和仿真。(4)研究跨层设计在多信道无线光网络中的应用。传统的多信道无线光网络路由协议只是对路由判据或者多信道MAC协议进行了改进,但在协议结构上还是采用分层结构。本文设计了一种适用于多信道无线光网络的跨层机会路由协议CLRP(Cross-Layer Routing Protocol)。该协议结合了本文提出的CAPC多信道MAC协议和ORBA路由协议,并进行了相应的修改,使其两者之间能够实现有效的信息交互。仿真结果表明,本文提出的CLRP协议在网络吞吐量、数据包成功投递率和路由收敛时间方面都优于传统的分层结构协议。
[Abstract]:This paper analyzes the existing indoor wireless optical network systems at home and abroad, and puts forward a multi-channel access strategy. In the networking, the cross-layer routing protocol of the multi-channel wireless optical network is analyzed to solve the problem that the traditional layered structure is not suitable for indoor wireless optical network networking, and the difference between different channels is proposed. Through the simulation of process trust model, the simulation results show that the method has certain advantages in the channel selection in the process of wireless optical network. The paper mainly consists of four parts: (1) The received letter of indoor visible light communication channel is analyzed. Phong model is introduced to simulate the signal power distribution characteristics. Compared with Lambert model, the simulation results based on Phong model can more accurately reflect the intensity distribution characteristics of indoor light power. On this basis, the indoor multipath noise at different transmission rates is analyzed and simulated with OOK modulation as an example. (2) The luminous principle and modulation characteristics of white LED are analyzed, the transmitting and receiving circuits of LED are designed and realized, and the modulation bandwidth of various LED in different modulation degrees is tested according to LE. D-frequency response characteristics, design equalization circuit, improve the system bandwidth; test and study the environmental noise and interference of the visible light communication system. (3) Considering the factors that restrict the performance of the visible light communication system, mainly including inter-symbol interference caused by multipath noise, interference caused by background light noise, and the limitation of LED modulation bandwidth and other factors, OK, P The performance of three wireless optical modulation technologies, PM and OFDM, is analyzed and simulated in practical visible optical communication systems. (4) The application of cross-layer design in multi-channel wireless optical networks is studied. A cross-layer opportunistic routing protocol CLRP (Cross-Layer Routing Protocol) for multi-channel wireless optical networks is designed in this paper. This protocol combines the CAPC multi-channel MAC protocol and ORBA routing protocol and makes corresponding modifications to enable effective information exchange between them. It is shown that the proposed CLRP protocol outperforms the traditional hierarchical protocol in terms of network throughput, packet delivery rate and routing convergence time.
【学位授予单位】：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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