本文選題：物理層安全 + MBM調(diào)制��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：無線通信技術(shù)的不斷發(fā)展使得傳輸安全面臨嚴(yán)峻考驗(yàn)。物理層安全作為一種在實(shí)際應(yīng)用中開銷合理、切實(shí)可行的無線通信安全機(jī)制,正受到越來越多的關(guān)注。物理層安全利用信道隨機(jī)性確保非法對手無法獲取合法信息。這種基于信息論和信號處理實(shí)現(xiàn)數(shù)據(jù)安全傳輸?shù)募夹g(shù),為信息安全領(lǐng)域提供了新的研究思路。而探索基于新型無線通信技術(shù)的物理層安全問題,具有重要的研究價(jià)值。媒介調(diào)制(Media-BasedModulation,MBM)是一種新型調(diào)制方式,它利用豐富的散射環(huán)境產(chǎn)生一系列信道,并將發(fā)送信息包含在傳輸媒介中。該調(diào)制利用無線信道隨機(jī)性和獨(dú)特性的核心思想與物理層安全一致,因此可以研究基于該調(diào)制提高物理層安全的方法。大規(guī)模多輸入多輸出(Multiple Input Multiple Output,MIMO)技術(shù)是一種具有頻譜及功率效率優(yōu)勢的新興無線通信技術(shù)。通過在基站覆蓋區(qū)域布置數(shù)十根或上百根天線,它能極大地提升頻譜效率和數(shù)據(jù)傳輸速率。但是大量天線對物理層安全的作用卻很少有研究關(guān)注。本學(xué)位論文針對MBM系統(tǒng)和大規(guī)模MIMO系統(tǒng)特點(diǎn),圍繞基于兩種系統(tǒng)的物理層安全問題展開,具體研究內(nèi)容如下:在討論MBM系統(tǒng)物理層安全問題之前,我們首先研究該系統(tǒng)的基本原理、基本模型和接收檢測方法,為后續(xù)研究打下基礎(chǔ)。與傳統(tǒng)的相移鍵控(Phase Shift Keying,PSK)、正交振幅調(diào)制(Quadrature Amplitude Modulation,QAM)等源調(diào)制(Source-Based Modulation,SBM)不同,MBM的核心思想是將發(fā)送信息包含在傳輸媒介中,即利用信道的隨機(jī)性和獨(dú)特性來發(fā)送不同消息。所有傳輸信道將映射形成接收星座圖。文中首先研究了該調(diào)制系統(tǒng)的基本原理,然后介紹了單輸入和多輸入兩種類型的MBM系統(tǒng)及其傳輸特性,并提出該調(diào)制下接收機(jī)一種可行的信號檢測算法。針對MBM系統(tǒng)的物理層安全問題,我們主要研究存在單個(gè)被動(dòng)竊聽對手的情況下,提升系統(tǒng)安全性的方法。根據(jù)MBM系統(tǒng)可以自由選擇大量傳輸信道的特點(diǎn),我們提出了基于信道選擇來提升系統(tǒng)安全性能的方法,且該方法沒有在收發(fā)端之間進(jìn)行信道信息傳輸?shù)囊蟆；诓煌疤釛l件,我們提出了三種信道選擇方案,分別為理想條件下最優(yōu)信道選擇、實(shí)際條件下可行信道選擇和人工噪聲(Artificial Noise,AN)輔助信道選擇三種方案。我們詳細(xì)研究并仿真分析了三種信道選擇方案的保密中斷概率和保密級數(shù),并比較了其對安全性的提升作用。仿真結(jié)果證明,由于MBM有大量待選發(fā)送信道,只要通過一定條件的信道選擇,就能大幅提高系統(tǒng)的安全性能。我們研究了基于大規(guī)模MIMO系統(tǒng)的物理層安全問題。首先我們介紹了大規(guī)模MIMO系統(tǒng)的通信竊聽模型。該模型條件下,我們分析了多天線對手使用不同接收方式,并分別采用被動(dòng)竊聽和主動(dòng)攻擊導(dǎo)頻及數(shù)據(jù)部分時(shí)對系統(tǒng)保密速率的影響。通過對系統(tǒng)保密速率、保密中斷概率和保密級數(shù)的推導(dǎo)分析可知,由于大規(guī)模MIMO基站布置了大量天線并使用預(yù)編碼,被動(dòng)竊聽和針對數(shù)據(jù)部分的主動(dòng)攻擊對系統(tǒng)的安全性能幾乎不會(huì)造成影響。因此主動(dòng)攻擊成為威脅大規(guī)模MIMO系統(tǒng)安全性的有效手段。我們進(jìn)一步研究了大規(guī)模MIMO基站針對主動(dòng)攻擊的檢測方法。在分析已有的能量檢測法和導(dǎo)頻相關(guān)法之后,我們提出了一種將能量檢測與導(dǎo)頻相關(guān)相結(jié)合的簡易算法。仿真結(jié)果證明我們的算法具有魯棒性,并能夠有效提升檢測性能。
[Abstract]:The continuous development of wireless communication technology has made the transmission security face a severe test. Physical layer security, as a reasonable and feasible wireless communication security mechanism in practical applications, is receiving more and more attention. The physical layer is safe to use channel randomness to ensure that illegal hands are unable to obtain legal information. The technology of data security transmission with signal processing provides new research ideas for the field of information security, and it has important research value to explore the physical layer security problem based on new wireless communication technology. Media-BasedModulation (MBM) is a new mode of modulation. It produces a system using a rich scattering environment. The Multiple Input Multiple Output (MIMO) technology is a kind of spectrum and a method for improving the physical layer security based on the modulation, which is the core idea of the radio channel randomness and uniqueness and the physical layer. The power efficiency advantage of the new wireless communication technology. By laying dozens or hundreds of antennas in the base station coverage area, it can greatly improve the frequency efficiency and the data transmission rate. However, there is little research attention on the effect of a large number of antennas on the security of the physical layer. This dissertation focuses on the characteristics of the MBM system and the large-scale MIMO system. Based on the physical layer security problem of two systems, the specific research content is as follows: before discussing the physical layer security problem of the MBM system, we first study the basic principle of the system, the basic model and the reception detection method, which lays the foundation for the follow-up research. And the traditional phase shift keying (Phase Shift Keying, PSK), orthogonal amplitude modulation (Quadra). The ture Amplitude Modulation, QAM) equal source modulation (Source-Based Modulation, SBM) is different. The core idea of MBM is to include the transmission information in the transmission medium, that is to use the randomness and uniqueness of the channel to send different messages. All the transmission channels will be mapped to form a reception constellation. In this paper, the basic original of the modulation system is studied. Then, we introduce two types of MBM systems with single input and multiple inputs and their transmission characteristics, and propose a feasible signal detection algorithm under the modulated receiver. In view of the physical layer security problem of the MBM system, we mainly study the method of improving the security of the system under the presence of a single passive eavesdropping opponent. According to the MBM system, In order to select a large number of transmission channels freely, we propose a method to improve the security performance of the system based on channel selection, and this method does not require channel information transmission between the transceiver. Based on different preconditions, we propose three channel selection schemes, which are the optimal channel selection under ideal conditions, and the actual conditions are practical. The feasible channel selection and the artificial noise (Artificial Noise, AN) auxiliary channel selection are three schemes. We have studied and simulated the secrecy probability and the security series of the three channel selection schemes in detail, and compared its enhancement to the security. The simulation results show that as the MBM has a large number of channels to be selected to send, only through After a certain channel selection, the security performance of the system can be greatly improved. We have studied the physical layer security problem based on the large-scale MIMO system. First, we introduce the communication eavesdropping model of the large-scale MIMO system. Under this model, we analyze the multiple antenna opponents using different reception methods and use passive eavesdropping respectively. And the influence of the active attack on the system secrecy rate and the data part. Through the analysis of the system secrecy rate, the secrecy interrupt probability and the security series, it is found that the large-scale MIMO base station has a large number of antennas and used precoding, the passive eavesdropping and the active attack against the data division are almost not safe to the system. Therefore, active attack is an effective means to threaten the security of large-scale MIMO systems. We have further studied the detection methods of large-scale MIMO base stations for active attack. After analyzing the existing method of energy detection and pilot correlation, we put forward a simple calculation of combining the energy detection with the pilot correlation. Simulation results show that our algorithm is robust and can effectively enhance the detection performance.
【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】：TN918;TN919.3
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本文編號：2085617