發(fā)布時間：2018-08-04 08:45

【摘要】：無線Ad Hoc網(wǎng)絡(luò)是一種自組織的移動網(wǎng)絡(luò),相對于傳統(tǒng)蜂窩網(wǎng)絡(luò),它無需固定基礎(chǔ)設(shè)施進(jìn)行集中控制,由于其靈活的組網(wǎng)、高生存性的特點(diǎn),廣泛應(yīng)用于軍事、民用和商業(yè)領(lǐng)域。Ad Hoc網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)是動態(tài)的,所以網(wǎng)絡(luò)的連通性至關(guān)重要,它是Ad Hoc網(wǎng)絡(luò)的先決條件,是所有網(wǎng)絡(luò)頂層設(shè)計的基礎(chǔ)。本文基于隨機(jī)幾何中的相關(guān)知識,研究了Ad Hoc網(wǎng)絡(luò)的連通性問題,對影響網(wǎng)絡(luò)連通性的因素進(jìn)行分析�；谶B通網(wǎng)絡(luò)對鏈路有效性進(jìn)行分析,研究了一維和二維Ad Hoc網(wǎng)絡(luò)的二連通性問題。從概率的角度分析一維Ad Hoc網(wǎng)絡(luò)實(shí)現(xiàn)二連通的基本條件,并給出了網(wǎng)絡(luò)二連通概率。針對二維網(wǎng)絡(luò),利用Ad Hoc網(wǎng)絡(luò)節(jié)點(diǎn)的可移動性,研究了一種提高鏈路有效性的節(jié)點(diǎn)移動算法,該算法在使用盡可能少的能耗下實(shí)現(xiàn)將一連通的網(wǎng)絡(luò)轉(zhuǎn)化為二連通的網(wǎng)絡(luò),增強(qiáng)了網(wǎng)絡(luò)的連通性以及抗毀性。分析衰落信道下的網(wǎng)絡(luò)連通性,基于泊松點(diǎn)過程建立網(wǎng)絡(luò)節(jié)點(diǎn)分布模型,在瑞利衰落信道模型下,將信噪比(SNR)作為成功通信的條件,推導(dǎo)給出了網(wǎng)絡(luò)中任意節(jié)點(diǎn)成為孤立節(jié)點(diǎn)的概率,進(jìn)而得出網(wǎng)絡(luò)的連通概率,并且分析了網(wǎng)絡(luò)基本參數(shù)對網(wǎng)絡(luò)連通性的影響。研究干擾對網(wǎng)絡(luò)連通性的影響,基于散粒噪聲理論建立干擾模型,得到干擾的統(tǒng)計特性,以信干比(SIR)作為節(jié)點(diǎn)成功通信的條件,推導(dǎo)給出了網(wǎng)絡(luò)中不存在孤立節(jié)點(diǎn)的概率,仿真結(jié)果驗(yàn)證了理論推導(dǎo)的正確性,并表明密集的網(wǎng)絡(luò)所帶來的干擾也將增大,合理有效分布節(jié)點(diǎn)位置將提高網(wǎng)絡(luò)的連通性。研究MAC層協(xié)議對干擾的有效抑制,采用CSMA協(xié)議,在瑞利衰落信道下,基于Matern過程建立網(wǎng)絡(luò)節(jié)點(diǎn)分布模型,得出網(wǎng)絡(luò)的節(jié)點(diǎn)密度,建立了CSMA機(jī)制下的干擾模型,分析干擾的統(tǒng)計規(guī)律,在信干比(SIR)模型下,推導(dǎo)給出了網(wǎng)絡(luò)不含孤立節(jié)點(diǎn)的概率。從仿真結(jié)果來看,CSMA機(jī)制對干擾有較好的抑制作用,能夠有效提高網(wǎng)絡(luò)連通性。
[Abstract]:Wireless Ad Hoc network is a kind of self-organizing mobile network. Compared with traditional cellular network, wireless Ad Hoc network does not need fixed infrastructure for centralized control. Because of its flexible network and high survivability, wireless Ad Hoc network is widely used in military. The topology of the civil and commercial domain. Ad Hoc network is dynamic, so the connectivity of the network is very important. It is the precondition of Ad Hoc network and the foundation of all the top-level design of Ad Hoc network. In this paper, based on the knowledge of random geometry, the connectivity of Ad Hoc networks is studied, and the factors affecting the connectivity of Ad Hoc networks are analyzed. Based on the analysis of link efficiency in connected networks, the two-connectivity problem of one-dimensional and two-dimensional Ad Hoc networks is studied. In this paper, the basic conditions for the realization of two-connectivity in one-dimensional Ad Hoc networks are analyzed from the point of view of probability, and the probability of two-connected networks is given. Based on the mobility of nodes in Ad Hoc networks, a node mobility algorithm is proposed to improve the link efficiency. The algorithm can transform a connected network into a two-connected network with as little energy consumption as possible. The connectivity and invulnerability of the network are enhanced. The network connectivity in fading channel is analyzed, and the network node distribution model is established based on Poisson point process. In Rayleigh fading channel model, SNR (SNR) is taken as the condition of successful communication. The probability of any node becoming an isolated node in the network is derived and the connectivity probability of the network is obtained. The influence of the basic network parameters on the connectivity of the network is analyzed. The influence of interference on network connectivity is studied. Based on the theory of granular noise, the interference model is established, and the statistical characteristics of interference are obtained. The signal-to-interference ratio (SIR) is used as the condition for successful communication between nodes, and the probability of the absence of isolated nodes in the network is derived. The simulation results verify the correctness of the theoretical derivation and show that the interference caused by the dense network will increase and the connectivity of the network will be improved by reasonably and effectively distributing the location of nodes. The effective suppression of interference by MAC layer protocol is studied. In Rayleigh fading channel, using CSMA protocol, the network node distribution model is established based on the Matern process, the node density of the network is obtained, and the interference model under the CSMA mechanism is established. The statistical law of interference is analyzed and the probability of the network without isolated nodes is derived under the signal-to-interference ratio (SIR) model. The simulation results show that CSMA mechanism can suppress interference and improve network connectivity effectively.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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