基于随机几何的认知Ad Hoc网络性能研究

发布时间：2018-03-27 11:03

本文选题：Ad　切入点：Hoc网络　出处：《南京邮电大学》2014年硕士论文

【摘要】：Ad Hoc网络的快速自组织性使得它成为当下研究的热点和普遍使用的网络模型,它可以用于很多紧急极端场景,解决很多实际问题；另一方面,认知无线电技术也是目前解决无线资源频谱紧俏问题的一个关键技术,认知用户使用频谱检测技术查找频谱空穴并通过该空穴进行通信,以提高频谱的利用率,避免大量频谱空闲但很多用户却无法通信的情况发生。鉴于二者各自的优点,认知Ad Hoc网络将两种技术进行结合使用,各节点通过空闲频谱进行通信,提高了频谱利用率的同时也带来了干扰,这部分干扰严重影响了网络的性能。本文主要研究了认知Ad Hoc网络的干扰及其网络性能,通过对干扰的统计分析建模,获得相关的性能表达式,并仿真分析。首先,本文研究了一般Ad Hoc网络的干扰统计方法,在随机几何的基础上计算所有用户引入的累积干扰,在路径损耗和网络几何两个关键因素的影响下得出不同网络的累积干扰统计表达式,并给出了一维和二维空间网络的中断性能。其次,根据统计表达式对认知Ad Hoc网络中的累积干扰进行建模,构建了不同衰落信道下的干扰模型,并分别计算出模型特征参数、中断性能,以及网络的整体性能。仿真结果表明,理论分析与仿真结果基本一致,证明了所构建干扰模型的正确性。最后,以认知主用户的中断概率作为约束条件,从认知次用户的角度定义描述次用户通信密度的传输容量,分别在非衰落信道下和衰落信道下进行推导,结果给出了两种情况下的中断概率和传输容量,还对衰落信道进行深度分析,获得了瑞利信道和Nakagami信道中的性能表达式,分析结果和仿真结果不仅具有数学意义,对实际网络布置也具有很重要的实用意义。
[Abstract]:The rapid self-organization of Ad Hoc network makes it a hot topic in current research and a widely used network model. It can be used in many emergency extreme scenarios and solve many practical problems; on the other hand, Cognitive radio technology is also a key technology to solve the problem of spectrum scarcity of wireless resources. Cognitive users use spectrum detection technology to find spectrum holes and communicate through them to improve the efficiency of spectrum utilization. In view of their respective advantages, cognitive Ad Hoc networks combine the two technologies to communicate through idle spectrum. This paper mainly studies the interference of cognitive Ad Hoc network and its network performance. The related performance expressions are obtained and simulated. Firstly, the interference statistical method of general Ad Hoc network is studied, and the cumulative interference introduced by all users is calculated on the basis of random geometry. Under the influence of two key factors, path loss and network geometry, the statistical expressions of cumulative interference of different networks are obtained, and the interruption performance of one and two dimensional space networks is given. Based on the statistical expressions, the cumulative interference in cognitive Ad Hoc networks is modeled, and the interference models in different fading channels are constructed. The characteristic parameters of the model, the interrupt performance and the overall performance of the network are calculated respectively. The simulation results show that, The theoretical analysis is in agreement with the simulation results, which proves the correctness of the interference model. Finally, using the interrupt probability of the cognitive primary user as the constraint condition, the transmission capacity of the communication density of the secondary user is defined from the perspective of the cognitive secondary user. The outage probability and transmission capacity are derived in both non-fading channel and fading channel, and the performance expressions in Rayleigh channel and Nakagami channel are obtained by analyzing the depth of fading channel. The results of analysis and simulation are not only of mathematical significance, but also of practical significance to the actual network layout.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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