本文選題：MIMO系統(tǒng)　切入點(diǎn)：波束成形　出處：《浙江大學(xué)》2017年碩士論文

【摘要】：隨著無線通信的發(fā)展,人們對于通信的安全性提出了越來越高的要求。物理層安全技術(shù)作為傳統(tǒng)密碼加密技術(shù)的補(bǔ)充與升級,成為當(dāng)下的研究熱點(diǎn)。目前,學(xué)者們主要考慮將波束成形、中繼和人工噪聲(ArtificialNoise,AN)這三種技術(shù)應(yīng)用在物理層安全的研究中。本文主要探索這三種物理層技術(shù)在具體系統(tǒng)下的聯(lián)合應(yīng)用,針對不同的系統(tǒng)提出了有效的設(shè)計(jì)方案,以保障通信的安全性。本文首先介紹了物理層安全領(lǐng)域的研究背景和發(fā)展現(xiàn)狀,研究了信息安全理論原理、經(jīng)典竊聽信道模型和凸優(yōu)化的基本知識,作為后續(xù)設(shè)計(jì)的理論基礎(chǔ)。本文還總結(jié)了目前波束成形、中繼和AN這三種物理層技術(shù)在安全通信方面的應(yīng)用情況,提出了改進(jìn)意見和進(jìn)一步探索的方向。在此基礎(chǔ)上,本文針對兩種不同的多輸入多輸出(Multiple Input MultipleOutput,MIMO)系統(tǒng),分別實(shí)現(xiàn)了波束成形技術(shù)和中繼、AN技術(shù)的聯(lián)合應(yīng)用,提出了具體的設(shè)計(jì)方案。對于單用戶多竊聽者的MIMO協(xié)作中繼系統(tǒng),本文以最大化合法接收者的信噪比(Signal to Noise Ratio,SNR)為目標(biāo),在滿足能量約束和一系列安全約束的條件下聯(lián)合設(shè)計(jì)波束成形向量和中繼放大轉(zhuǎn)發(fā)矩陣。針對合法信道和竊聽信道都是理想信道狀態(tài)信息(Channel State Information,CSI)的模型,提出了 基于迭代優(yōu)化(Alternating Optimization,AO)和轉(zhuǎn)換中繼(SwitchedRelaying,SR)的兩種算法。本文將這兩類算法推廣到了合法信道理想CSI而竊聽信道非理想CSI的情況,結(jié)合S-程序法完成了具有魯棒性的算法設(shè)計(jì)。此外,本文還探索了簡化的SR算法,給出了SR方案下置換矩陣碼本的設(shè)計(jì)方案,并對竊聽者模型進(jìn)行了簡單的擴(kuò)展。將所提出的算法與現(xiàn)有的基于半定松弛(Semi-Definite Relaxation,SDR)的AO算法、零空間法、單獨(dú)優(yōu)化波束成形向量的算法以及單獨(dú)優(yōu)化中繼放大轉(zhuǎn)發(fā)矩陣的算法進(jìn)行對比,發(fā)現(xiàn)無論在竊聽信道理想CSI條件下還是非理想CSI條件下,本文提出的算法相對于現(xiàn)有的算法和單獨(dú)優(yōu)化一個變量的算法而言,都具有更好的SNR性能和更低的復(fù)雜度。對于多用戶多竊聽者的MIMO安全通信系統(tǒng),本文考慮了兩種不同的假設(shè):(1)合法信道理想CSI、竊聽信道非理想CSI的情況;(2)合法信道和竊聽信道均為非理想CSI的情況。本文以最大化合法用戶總速率為目標(biāo),聯(lián)合應(yīng)用波束成形技術(shù)和AN技術(shù),在滿足能量約束和竊聽概率約束的條件下,提出了具有魯棒性的波束成形向量和AN聯(lián)合設(shè)計(jì)方案。本文首先將合法用戶總速率最大化問題等效為加權(quán)均方誤差最小化問題,同時(shí)利用Bernstein型不等式將竊聽概率約束轉(zhuǎn)化為一系列線性矩陣不等式(LinearMatrix Inequality,LMI)和二階錐(SecondOrderCone,SOC)約束,提出 了基于AO的算法。本文對兩種假設(shè)下所提出的算法進(jìn)行了復(fù)雜度分析和性能仿真。結(jié)果表明我們所提出的算法復(fù)雜度較低并且能夠有效地抵御信道CSI估計(jì)誤差對合法接收者總速率的影響,具有魯棒性。
[Abstract]:With the development of wireless communication, people put forward higher and higher requirements for the security of communication. As a supplement and upgrade of traditional cryptographic encryption technology, physical layer security technology has become the current research hotspot. The researchers mainly consider the application of beamforming, relay and artificial noise to the research of physical layer security. In order to ensure the security of communication, effective design schemes are proposed for different systems. Firstly, this paper introduces the research background and development status of physical layer security, and studies the theory of information security. The classical eavesdropping channel model and the basic knowledge of convex optimization are used as the theoretical basis for the subsequent design. The applications of the three physical layer technologies, beamforming, relay and an, in secure communication are also summarized in this paper. On the basis of this, this paper realizes the joint application of beamforming technology and relay an technology for two different multiple Input multiple output MOMOs. For the MIMO cooperative relay system with single user and multiple eavesdroppers, the aim of this paper is to maximize the signal-to-noise ratio (SNR) of the legitimate receiver. The beamforming vector and relay amplifying and forwarding matrix are designed jointly under the condition that energy constraints and a series of security constraints are satisfied. According to the model of both legitimate channel and eavesdropping channel which are ideal channel state information channel State information (CSI), the beamforming vector and relay amplification and forwarding matrix are designed. Two algorithms based on iterative optimization optimization (AOA) and switched relaying (SRS) are proposed. In this paper, the two algorithms are extended to the case of the legitimate channel ideal CSI and the eavesdropping channel non-ideal CSI. In addition, the simplified SR algorithm is explored, and the design scheme of permutation matrix codebook under SR scheme is given. And the eavesdropper model is simply extended. The proposed algorithm is combined with the existing AO algorithm based on semidefinite relaxation Semi-Definite Relationation.Zero-space method. By comparing the algorithms of single optimized beamforming vector and single optimization of relay amplification and forwarding matrix, it is found that, whether under the ideal CSI condition or the non-ideal CSI condition of eavesdropping channel, The algorithm proposed in this paper has better SNR performance and lower complexity than the existing algorithms and single optimization algorithms. For the MIMO secure communication system with multi-user and multi-eavesdropper, the proposed algorithm has better performance and lower complexity. In this paper, we consider two different assumptions: the ideal CSI in the legal channel, the non-ideal CSI in the eavesdropping channel, and the non-ideal CSI in both the lawful channel and the eavesdropping channel. In combination with beamforming and an technology, under the condition of energy constraint and eavesdropping probability constraint, A robust beamforming vector and an joint design scheme is proposed. Firstly, the problem of maximizing the total rate of legitimate users is equivalent to the weighted mean square error minimization problem. At the same time, the eavesdropping probability constraints are transformed into a series of linear matrix inequalities (LMIs) and second order order cones (SOC) constraints by using Bernstein type inequality. The algorithm based on AO is proposed. The complexity analysis and performance simulation of the two hypotheses are carried out. The results show that the proposed algorithm has lower complexity and can effectively resist channel CSI estimation. The effect of errors on the total rate of the legitimate receiver, It has robustness.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.3
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本文編號：1666895