【摘要】：無(wú)線通信網(wǎng)絡(luò)安全是一個(gè)不可忽視的問(wèn)題。近年來(lái),隨著無(wú)線通信技術(shù)的普及程度越來(lái)越高,無(wú)線通信網(wǎng)絡(luò)種類不斷增多,用戶在使用無(wú)線通信業(yè)務(wù)時(shí)的安全性正面臨著嚴(yán)峻的挑戰(zhàn)。由于無(wú)線信道所具有的廣播特性,在無(wú)線網(wǎng)絡(luò)覆蓋范圍內(nèi)的惡意用戶可以通過(guò)竊聽(tīng)的方式截獲到所傳輸?shù)男盘?hào)。如果傳輸?shù)男畔⒅猩婕吧虡I(yè)或者軍事領(lǐng)域的重要機(jī)密,其結(jié)果就會(huì)造成巨大的損失。物理層安全就是為解決這個(gè)問(wèn)題為目的而被提出和研究的。在物理層安全技術(shù)的框架下,本文將研究重點(diǎn)放在中繼竊聽(tīng)信道的物理層安全問(wèn)題上。在中繼竊聽(tīng)信道中,為了提升整個(gè)竊聽(tīng)信道網(wǎng)絡(luò)中的安全性能,發(fā)送者會(huì)選擇通過(guò)中繼節(jié)點(diǎn)轉(zhuǎn)發(fā)信息或者協(xié)作干擾的方式來(lái)提升系統(tǒng)安全性能。但是,如果處理不當(dāng),中繼節(jié)點(diǎn)在轉(zhuǎn)發(fā)模式時(shí)可能會(huì)同時(shí)提升竊聽(tīng)者的接收性能,或者在協(xié)作干擾模式時(shí),干擾信號(hào)也會(huì)對(duì)合法接收者的接收性能產(chǎn)生不利影響。在這種情況下,合法用戶無(wú)法得到較高的安全容量。針對(duì)這個(gè)問(wèn)題,本文對(duì)如何進(jìn)一步提升中繼竊聽(tīng)信道的安全容量做了深入的研究,對(duì)研究主要結(jié)果可概括為:(1)針對(duì)中繼竊聽(tīng)信道中,由于中繼模式單一所導(dǎo)致的安全容量可能降低的問(wèn)題,提出了基于多中繼節(jié)點(diǎn)協(xié)作的聯(lián)合中繼傳輸機(jī)制。在所提出的機(jī)制中,多個(gè)中繼節(jié)點(diǎn)根據(jù)網(wǎng)絡(luò)環(huán)境,分別負(fù)責(zé)轉(zhuǎn)發(fā)和協(xié)作干擾工作,從而達(dá)到在提升安全容量的目標(biāo);(2)針對(duì)協(xié)作干擾信號(hào)對(duì)合法接受者產(chǎn)生有害影響而使網(wǎng)絡(luò)安全容量降低的問(wèn)題,提出了基于極化濾波技術(shù)的DF-CJ混合傳輸機(jī)制傳輸機(jī)制。在所提出的機(jī)制中,中繼節(jié)點(diǎn)和合法用戶接受者能夠通過(guò)極化濾波技術(shù)消除合法接受者端的干擾信號(hào),從而進(jìn)一步提升網(wǎng)絡(luò)的安全容量。除此之外,通過(guò)引入計(jì)劃天線,一個(gè)中繼節(jié)點(diǎn)可同時(shí)具有轉(zhuǎn)發(fā)和協(xié)作干擾雙重功能。該特點(diǎn)能夠?yàn)榘踩畔鬏斕峁┝烁嗟膫鬏敳呗赃x擇,提高了系統(tǒng)對(duì)網(wǎng)絡(luò)環(huán)境的適應(yīng)能力;(3)最后,針對(duì)所提出的DF-CJ混合傳輸機(jī)制,分析了兩階段信號(hào)傳輸過(guò)程,并建立了以安全容量為目標(biāo)的最優(yōu)化問(wèn)題模型,并通過(guò)KKT算法得到了使安全容量最大的功率分配方案。
[Abstract]:The security of wireless communication network is a problem that can not be ignored. In recent years, with the increasing popularity of wireless communication technology and the increasing variety of wireless communication networks, the security of users in the use of wireless communication services is facing a severe challenge. Due to the broadcast characteristics of wireless channels, malicious users in the wireless network coverage can intercept the transmitted signals by eavesdropping. If the information transmitted involves important secrets in the commercial or military field, the result will be huge losses. Physical layer security is proposed and studied to solve this problem. In the framework of physical layer security, this paper focuses on the physical layer security of relay eavesdropping channel. In the relay eavesdropping channel, in order to improve the security performance of the whole eavesdropping channel, the sender will choose to transmit information or cooperative interference to improve the security performance of the system. However, if it is not handled properly, the relay node may improve the performance of the eavesdropper in the forwarding mode at the same time, or in the cooperative interference mode, the interference signal will also have a negative impact on the reception performance of the legitimate receiver. In this case, legitimate users can not get a higher security capacity. To solve this problem, this paper makes a deep research on how to further improve the security capacity of relay eavesdropping channel. The main results can be summarized as follows: (1) in the relay eavesdropping channel, Due to the problem that the security capacity may be reduced due to the single relay mode, a joint relay transmission mechanism based on multi-relay node cooperation is proposed. In the proposed mechanism, multiple relay nodes are responsible for forwarding and cooperating with each other according to the network environment. In order to achieve the goal of improving the security capacity. (2) aiming at the problem that cooperative interference signal has harmful effect on the legitimate receiver and reduces the network security capacity, a hybrid DF-CJ transmission mechanism based on polarization filtering technology is proposed. In the proposed mechanism, the relay node and the legitimate user receiver can eliminate the interference signals from the legitimate receiver through polarization filtering technology, which can further enhance the security capacity of the network. In addition, by introducing a planned antenna, a relay node can have both forwarding and cooperative interference functions. This feature can provide more choice of transmission strategy for secure information transmission, and improve the adaptability of the system to network environment. (3) finally, for the proposed DF-CJ hybrid transmission mechanism, the two-stage signal transmission process is analyzed. An optimization model with the goal of safe capacity is established, and the power allocation scheme to maximize the safe capacity is obtained by KKT algorithm.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN918

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