本文選題：物理層安全　切入點(diǎn)：人工干擾　出處：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：無線通信對現(xiàn)代人們的生活、工作和學(xué)習(xí)等方方面面產(chǎn)生日益巨大的影響,無線通信系統(tǒng)的兩個(gè)基本問題是數(shù)據(jù)的可靠性和有效性,然而,數(shù)據(jù)在空間中以電磁波的形式傳播,無線信道具有廣播、衰落和易接入的基本特征,非法的竊聽者試圖獲取正在進(jìn)行傳輸?shù)男畔⒍槐话l(fā)現(xiàn),甚至網(wǎng)絡(luò)中存在惡意的發(fā)送者或干擾者,試圖降低期望接收者的信號,數(shù)據(jù)的可靠通信將會(huì)面臨巨大的威脅。一直以來人們對物理層干擾策略有著很大興趣,尤其是在軍事網(wǎng)絡(luò)中,數(shù)據(jù)傳輸?shù)陌踩砸恢庇删W(wǎng)絡(luò)層基于密鑰的加密技術(shù)來保證的,加密體制的高計(jì)算復(fù)雜度和復(fù)雜的密鑰分配及管理問題,推動(dòng)了物理層安全通信人工干擾技術(shù)的產(chǎn)生和發(fā)展。物理層安全主要是指存在非法竊聽者的情況下,保證機(jī)密消息在無線媒質(zhì)中能夠安全可靠傳輸,而無需依賴于更高層的加密體制,物理層安全的基本原則是利用噪聲固有的隨機(jī)性和通信信道,在對手的計(jì)算資源不受限和已知網(wǎng)絡(luò)參數(shù)情況下,來限制對手可獲得的信息比特?cái)?shù),可達(dá)到的安全性以保密速率或保密容量精確量化。本文研究的是物理層安全通信方法中的一種,不需要產(chǎn)生密鑰,發(fā)送者在發(fā)送有用信號的同時(shí),利用一部分可用功率發(fā)送人工干擾信號,通過設(shè)計(jì)合理的發(fā)送預(yù)編碼機(jī)制,只降低竊聽者的信道,再考慮一些可獲得的信道狀態(tài)信息,達(dá)到安全通信。本文首先研究了單用戶MIMO系統(tǒng)人工干擾的應(yīng)用,介紹了lattice檢測理論,將人工干擾信號的模值歸一化到一個(gè)特定的值,強(qiáng)制干擾項(xiàng)位于竊聽者檢測區(qū)域的邊界,提高竊聽者的誤碼率,并克服了竊聽端天線數(shù)目必須小于發(fā)射端天線數(shù)目的限制。本文提出一個(gè)基于干擾對齊的人工干擾安全通信方法,系統(tǒng)模型為多用戶多竊聽者M(jìn)IMO干擾信道,發(fā)送者同時(shí)發(fā)送有用信號和人工干擾信號,通過設(shè)計(jì)合理的發(fā)送預(yù)編碼機(jī)制,即有用信號的預(yù)編碼矩陣滿足干擾對齊,消除了用戶間干擾,人工干擾預(yù)編碼矩陣用于干擾竊聽者,降低竊聽者的信道質(zhì)量,提高用戶的保密速率。本文用Matlab仿真軟件對以上兩種方法分別進(jìn)行了仿真,并對仿真結(jié)果進(jìn)行了分析。
[Abstract]:Wireless communication has great influence on many aspects of modern people's life, work and study. The two basic problems of wireless communication system are the reliability and validity of data. However, the data is transmitted in the form of electromagnetic wave in space. The wireless channel has the basic characteristics of broadcast, fading and easy access, illegal eavesdroppers try to obtain the information being transmitted without being found, and even the malicious sender or jammer exists in the network, trying to reduce the signal of the intended receiver. The reliable communication of data will face a great threat. People have always been interested in the interference strategy of physical layer, especially in military network, the security of data transmission has always been guaranteed by the encryption technology based on key in the network layer. The high computational complexity and complex key distribution and management problems of encryption system promote the production and development of physical layer security communication artificial interference technology. Physical layer security mainly refers to the presence of illegal eavesdroppers. The basic principle of physical layer security is to make use of the inherent randomness of noise and communication channel to ensure that confidential messages can be transmitted safely and reliably in wireless media without relying on a higher level encryption system. To limit the number of bits of information available to the opponent if the computing resources of the opponent are not limited and the network parameters are known, The reachable security is quantized precisely at the rate or capacity of security. In this paper, we study one of the physical layer secure communication methods, which does not need to generate the key, and the sender sends the useful signal at the same time. A part of available power is used to transmit artificial interference signal. By designing reasonable transmission precoding mechanism, only the channel of eavesdropper is reduced, and some available channel state information is considered. In order to achieve secure communication, this paper first studies the application of artificial interference in single user MIMO system, introduces the theory of lattice detection, normalizes the module value of artificial interference signal to a specific value, and forces the interference term to be located at the boundary of eavesdropping detection area. In order to improve the bit error rate of eavesdroppers and overcome the limitation that the number of antennas at the eavesdropping end must be smaller than the number of antennas at the transmitter, a secure communication method based on interference alignment is proposed in this paper. The system model is multi-user multi-eavesdropping MIMO interference channel. The sender sends both useful signal and artificial interference signal. By designing a reasonable transmission precoding mechanism, the pre-coding matrix of the useful signal meets the interference alignment. The interference between users is eliminated, the artificial interference precoding matrix is used to interfere with eavesdroppers, the channel quality of eavesdroppers is reduced, and the security rate of users is improved. The simulation results are analyzed.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN918.4

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相關(guān)碩士學(xué)位論文 前2條

1 梁利彥;基于人工干擾的物理層安全通信方法研究[D];西安電子科技大學(xué);2014年

2 張秀娟;基于人工干擾的物理層安全傳輸方案與容量優(yōu)化[D];重慶郵電大學(xué);2015年

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本文編號：1661255