本文選題：頻譜感知　切入點(diǎn)：感知鏈路干擾　出處：《電子科技大學(xué)》2017年碩士論文

【摘要】：頻譜感知是一個(gè)實(shí)時(shí)檢測(cè)授權(quán)頻段使用狀態(tài)的過(guò)程。次級(jí)用戶利用頻譜感知可實(shí)時(shí)觀測(cè)目標(biāo)頻段的狀態(tài)。這使得次級(jí)用戶機(jī)會(huì)性接入授權(quán)頻段和避免干擾主用戶成為可能。但是,惡意用戶通過(guò)在次級(jí)用戶的頻譜感知過(guò)程中發(fā)射干擾信號(hào),增加次級(jí)用戶對(duì)其所處環(huán)境中頻譜使用狀態(tài)做出誤判的概率,降低目標(biāo)系統(tǒng)的頻譜利用率。惡意用戶在目標(biāo)次級(jí)用戶的感知鏈路中,主動(dòng)發(fā)射干擾信號(hào)的方式,稱為感知鏈路干擾。本文針對(duì)感知鏈路的干擾問(wèn)題,從如何實(shí)施最優(yōu)干擾、如何對(duì)抗感知鏈路干擾這兩個(gè)方面,分別展開(kāi)了研究。首先,針對(duì)干擾機(jī)的不同地理位置,對(duì)目標(biāo)次級(jí)用戶的感知性能影響相應(yīng)不同的問(wèn)題,研究了干擾機(jī)的最優(yōu)干擾位置。具體而言,以最大化次級(jí)用戶網(wǎng)絡(luò)的平均誤檢概率為目標(biāo),分水平位置固定、水平位置可變兩種情況,從理論上給出了干擾機(jī)的最優(yōu)干擾位置,探討了不同干擾功率、不同次級(jí)用戶數(shù)量對(duì)最優(yōu)位置影響的規(guī)律,并通過(guò)計(jì)算機(jī)仿真進(jìn)行了驗(yàn)證。另一方面,論文針對(duì)重放攻擊,研究了如何對(duì)抗感知鏈路干擾的問(wèn)題。提出一種基于哈希驗(yàn)證碼的抗干擾策略。推導(dǎo)了所提方法在重放攻擊存在環(huán)境下的抗干擾性能。計(jì)算機(jī)仿真表明,在多種場(chǎng)景下,所提出方法的感知鏈路抗干擾性能優(yōu)于現(xiàn)有方法。本文對(duì)感知鏈路最優(yōu)干擾位置以及感知鏈路抗干擾策略的研究,豐富了現(xiàn)有的頻譜感知理論,為設(shè)計(jì)安全可靠的頻譜感知系統(tǒng)提供理論依據(jù)。
[Abstract]:Spectrum sensing is a process of detecting the state of authorized frequency band in real time. Secondary users can use spectrum sensing to observe the state of target frequency band in real time. This enables secondary users to access the authorized frequency band opportunistically and avoid interfering with primary users. It's possible. But, Malicious users transmit interference signals in the process of spectrum sensing of secondary users, thus increasing the probability of secondary users making misjudgment of spectrum usage status in their environment. The way that malicious users actively transmit interference signals in the target secondary users' perceptual links is called perceptual link interference. This paper aims at the interference problem of perceptual links and discusses how to implement optimal interference. How to counteract the perceptual link interference is studied separately. Firstly, aiming at the different geographical location of the jammer, it affects the perceived performance of the target secondary user. In this paper, the optimal jamming position of the jammer is studied. Specifically, aiming at maximizing the average false detection probability of the secondary user network, the optimal jamming position of the jammer is given theoretically, in which the horizontal position is fixed and the horizontal position is variable. The influence of different interference power and number of secondary users on the optimal position is discussed and verified by computer simulation. On the other hand, the paper aims at replay attack. In this paper, the problem of how to counteract perceptual link interference is studied, and an anti-jamming strategy based on hash verification code is proposed. The anti-jamming performance of the proposed method in the presence of replay attack is deduced. Computer simulation shows that, in many scenarios, The performance of the proposed method is better than that of the existing methods. In this paper, the research on the optimal interference location of the perceptual link and the anti-jamming strategy of the perceptual link enriches the existing spectrum sensing theory. It provides a theoretical basis for the design of a safe and reliable spectrum sensing system.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN97

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李方偉;馮德俊;朱江;;一種基于PUE惡意干擾的認(rèn)知無(wú)線電態(tài)勢(shì)感知方案[J];電信科學(xué);2013年12期

相關(guān)博士學(xué)位論文 前1條

1 彭啟航;認(rèn)知無(wú)線電頻譜感知干擾理論與方法研究[D];電子科技大學(xué);2011年

相關(guān)碩士學(xué)位論文 前1條

1 李紹元;有限任意形狀區(qū)域干擾建模研究[D];北京交通大學(xué);2013年

，

本文編號(hào)：1659482