无线Ad-Hoc网络平面移动模型及网络容量分析
发布时间：2019-02-15 13:37
【摘要】：随着大规模无线通信系统的广泛应用,用户以及接入点的空间位置往往并非完全规则部署。由于无线Ad-Hoc网络具有良好的自组织性,动态拓扑性及无中心性使其有迅速组网,快速部署等优点,成为国内外研究者的研究热点。无线Ad-Hoc网络中接收机接收信号的强度以及所承受的干扰强度都直接依赖于网络中节点的空间位置,无线Ad-Hoc网络的节点空间拓扑结构及其变动成为影响网络性能的关键。因此本文着重研究无线Ad-Hoc网络平面移动模型及时延,并分析了无线Ad-Hoc网络在通信过程中的干扰,最终通过网络容量来评价模型及网络的性能。在建立平面移动模型时,无线Ad-Hoc网络基于全双工双向通信系统(BFD)并采用IEEE802.11 DCF(RTS/CTS模式)标准。本文将无线Ad-Hoc网络分解为若干链路即网络中每两个节点组成一组节点对,节点对间的传输采用双向的多输入多输出技术(Two-Way MIMO)。本文通过节点间的距离定义通信状态,以连续两次运动的角度差判断运动方向,计算出不同通信状态的概率分布函数从而确立了无线Ad-Hoc网络的平面移动模型。在分析移动模型时延时,本文运用了二维Markov模型及排队理论,其中二维Markov模型中每个状态由尝试传输次数与竞争窗口大小两个指标构成,在进行信道竞争时采用M/G/1排队理论。最终得到了移动模型的平均时延并对其进行了模拟分析。而在干扰评估中,提出两种干扰评估方法,即节点干扰评估法和链路干扰评估法。其中节点干扰评估以节点对中的接收节点为研究对象,并以其为中心建立干扰评估范围,在干扰评估范围中搜索可能对其产生干扰的发送节点。在链路干扰评估中对网络中节点分为不同集合:发送节点集、接收节点集、重传发送节点集、重传接收节点集,分析发送端与接收端的链路进行干扰评估。本文推导出无线Ad-Hoc网络中干扰的概率分布函数并计算了SIR值。本文建立的无线Ad-Hoc网络平面移动模型及干扰分布函数最终通过网络容量进行综合分析,因为无线Ad-Hoc网络的传输容量是保证网络服务质量的关键性质之一。本文以中断概率、数据包到达率和网络时延作为主要指标推导出了基于全双工(BFD)双向移动Ad-Hoc网络的传输容量表达式。通过数值模拟验证无线Ad-Hoc网络平面移动模型及干扰分析的有效性及普遍性。
[Abstract]:With the wide application of large-scale wireless communication systems, the spatial location of users and access points is often not fully regular deployment. Because of its good self-organization, dynamic topology and non-centrality, wireless Ad-Hoc network has the advantages of rapid networking and rapid deployment, so it has become a research hotspot at home and abroad. The intensity of receiver received signals and the intensity of interference in wireless Ad-Hoc networks are directly dependent on the spatial location of nodes in the network. The spatial topology of nodes in wireless Ad-Hoc networks and their changes are the key factors affecting the performance of the networks. Therefore, this paper focuses on the planar mobile model and delay of wireless Ad-Hoc network, analyzes the interference of wireless Ad-Hoc network in the communication process, and finally evaluates the performance of the model and network through network capacity. When building the planar mobile model, the wireless Ad-Hoc network is based on the full duplex two-way communication system (BFD) and adopts the IEEE802.11 DCF (RTS/CTS mode) standard. In this paper, the wireless Ad-Hoc network is decomposed into several links, that is, each two nodes in the network form a set of node pairs. The transmission between node pairs is based on bi-directional multiple-input and multiple-output (Two-Way MIMO).) technology. In this paper, the communication state is defined by the distance between nodes, the direction of motion is judged by the angle difference of two successive motions, the probability distribution function of different communication states is calculated, and the planar moving model of wireless Ad-Hoc network is established. In analyzing the delay of the mobile model, this paper applies the two-dimensional Markov model and queuing theory, in which each state in the two-dimensional Markov model is composed of two indexes: the number of attempts to transmit and the size of the competing window. M/G/1 queuing theory is used in channel competition. Finally, the average delay of the mobile model is obtained and simulated. In the process of interference evaluation, two methods are proposed, namely, node interference evaluation and link interference evaluation. The node interference evaluation takes the receiving node in the node pair as the research object, and establishes the interference evaluation range with it as the center, and searches for the sending node that may interfere with it in the interference evaluation range. In the link interference evaluation, the nodes in the network are divided into different sets: sending node set, receiving node set, retransmitting transmitting node set, retransmitting receiving node set, and analyzing the link interference evaluation between the sender and receiver. In this paper, the probability distribution function of interference in wireless Ad-Hoc network is derived and the SIR value is calculated. The planar mobile model and interference distribution function of wireless Ad-Hoc network established in this paper are analyzed synthetically by network capacity, because the transmission capacity of wireless Ad-Hoc network is one of the key properties to guarantee the quality of service of the network. Based on the outage probability, packet arrival rate and network delay, this paper derives the expression of transmission capacity based on full-duplex (BFD) bidirectional mobile Ad-Hoc network. The effectiveness and universality of planar mobility model and interference analysis of wireless Ad-Hoc network are verified by numerical simulation.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
本文编号：2423412
[Abstract]:With the wide application of large-scale wireless communication systems, the spatial location of users and access points is often not fully regular deployment. Because of its good self-organization, dynamic topology and non-centrality, wireless Ad-Hoc network has the advantages of rapid networking and rapid deployment, so it has become a research hotspot at home and abroad. The intensity of receiver received signals and the intensity of interference in wireless Ad-Hoc networks are directly dependent on the spatial location of nodes in the network. The spatial topology of nodes in wireless Ad-Hoc networks and their changes are the key factors affecting the performance of the networks. Therefore, this paper focuses on the planar mobile model and delay of wireless Ad-Hoc network, analyzes the interference of wireless Ad-Hoc network in the communication process, and finally evaluates the performance of the model and network through network capacity. When building the planar mobile model, the wireless Ad-Hoc network is based on the full duplex two-way communication system (BFD) and adopts the IEEE802.11 DCF (RTS/CTS mode) standard. In this paper, the wireless Ad-Hoc network is decomposed into several links, that is, each two nodes in the network form a set of node pairs. The transmission between node pairs is based on bi-directional multiple-input and multiple-output (Two-Way MIMO).) technology. In this paper, the communication state is defined by the distance between nodes, the direction of motion is judged by the angle difference of two successive motions, the probability distribution function of different communication states is calculated, and the planar moving model of wireless Ad-Hoc network is established. In analyzing the delay of the mobile model, this paper applies the two-dimensional Markov model and queuing theory, in which each state in the two-dimensional Markov model is composed of two indexes: the number of attempts to transmit and the size of the competing window. M/G/1 queuing theory is used in channel competition. Finally, the average delay of the mobile model is obtained and simulated. In the process of interference evaluation, two methods are proposed, namely, node interference evaluation and link interference evaluation. The node interference evaluation takes the receiving node in the node pair as the research object, and establishes the interference evaluation range with it as the center, and searches for the sending node that may interfere with it in the interference evaluation range. In the link interference evaluation, the nodes in the network are divided into different sets: sending node set, receiving node set, retransmitting transmitting node set, retransmitting receiving node set, and analyzing the link interference evaluation between the sender and receiver. In this paper, the probability distribution function of interference in wireless Ad-Hoc network is derived and the SIR value is calculated. The planar mobile model and interference distribution function of wireless Ad-Hoc network established in this paper are analyzed synthetically by network capacity, because the transmission capacity of wireless Ad-Hoc network is one of the key properties to guarantee the quality of service of the network. Based on the outage probability, packet arrival rate and network delay, this paper derives the expression of transmission capacity based on full-duplex (BFD) bidirectional mobile Ad-Hoc network. The effectiveness and universality of planar mobility model and interference analysis of wireless Ad-Hoc network are verified by numerical simulation.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
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