發(fā)布時(shí)間：2018-03-27 11:03

  本文選題：Ad　切入點(diǎn)：Hoc網(wǎng)絡(luò)　出處：《南京郵電大學(xué)》2014年碩士論文

【摘要】：Ad Hoc網(wǎng)絡(luò)的快速自組織性使得它成為當(dāng)下研究的熱點(diǎn)和普遍使用的網(wǎng)絡(luò)模型,它可以用于很多緊急極端場(chǎng)景,解決很多實(shí)際問題；另一方面,認(rèn)知無線電技術(shù)也是目前解決無線資源頻譜緊俏問題的一個(gè)關(guān)鍵技術(shù),認(rèn)知用戶使用頻譜檢測(cè)技術(shù)查找頻譜空穴并通過該空穴進(jìn)行通信,以提高頻譜的利用率,避免大量頻譜空閑但很多用戶卻無法通信的情況發(fā)生。鑒于二者各自的優(yōu)點(diǎn),認(rèn)知Ad Hoc網(wǎng)絡(luò)將兩種技術(shù)進(jìn)行結(jié)合使用,各節(jié)點(diǎn)通過空閑頻譜進(jìn)行通信,提高了頻譜利用率的同時(shí)也帶來了干擾,這部分干擾嚴(yán)重影響了網(wǎng)絡(luò)的性能。本文主要研究了認(rèn)知Ad Hoc網(wǎng)絡(luò)的干擾及其網(wǎng)絡(luò)性能,通過對(duì)干擾的統(tǒng)計(jì)分析建模,獲得相關(guān)的性能表達(dá)式,并仿真分析。首先,本文研究了一般Ad Hoc網(wǎng)絡(luò)的干擾統(tǒng)計(jì)方法,在隨機(jī)幾何的基礎(chǔ)上計(jì)算所有用戶引入的累積干擾,在路徑損耗和網(wǎng)絡(luò)幾何兩個(gè)關(guān)鍵因素的影響下得出不同網(wǎng)絡(luò)的累積干擾統(tǒng)計(jì)表達(dá)式,并給出了一維和二維空間網(wǎng)絡(luò)的中斷性能。其次,根據(jù)統(tǒng)計(jì)表達(dá)式對(duì)認(rèn)知Ad Hoc網(wǎng)絡(luò)中的累積干擾進(jìn)行建模,構(gòu)建了不同衰落信道下的干擾模型,并分別計(jì)算出模型特征參數(shù)、中斷性能,以及網(wǎng)絡(luò)的整體性能。仿真結(jié)果表明,理論分析與仿真結(jié)果基本一致,證明了所構(gòu)建干擾模型的正確性。最后,以認(rèn)知主用戶的中斷概率作為約束條件,從認(rèn)知次用戶的角度定義描述次用戶通信密度的傳輸容量,分別在非衰落信道下和衰落信道下進(jìn)行推導(dǎo),結(jié)果給出了兩種情況下的中斷概率和傳輸容量,還對(duì)衰落信道進(jìn)行深度分析,獲得了瑞利信道和Nakagami信道中的性能表達(dá)式,分析結(jié)果和仿真結(jié)果不僅具有數(shù)學(xué)意義,對(duì)實(shí)際網(wǎng)絡(luò)布置也具有很重要的實(shí)用意義。
[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.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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