基于极化滤波的物理层安全技术研究
发布时间：2018-09-17 18:39
【摘要】：无线通信网络安全是一个不可忽视的问题。近年来,随着无线通信技术的普及程度越来越高,无线通信网络种类不断增多,用户在使用无线通信业务时的安全性正面临着严峻的挑战。由于无线信道所具有的广播特性,在无线网络覆盖范围内的恶意用户可以通过窃听的方式截获到所传输的信号。如果传输的信息中涉及商业或者军事领域的重要机密,其结果就会造成巨大的损失。物理层安全就是为解决这个问题为目的而被提出和研究的。在物理层安全技术的框架下,本文将研究重点放在中继窃听信道的物理层安全问题上。在中继窃听信道中,为了提升整个窃听信道网络中的安全性能,发送者会选择通过中继节点转发信息或者协作干扰的方式来提升系统安全性能。但是,如果处理不当,中继节点在转发模式时可能会同时提升窃听者的接收性能,或者在协作干扰模式时,干扰信号也会对合法接收者的接收性能产生不利影响。在这种情况下,合法用户无法得到较高的安全容量。针对这个问题,本文对如何进一步提升中继窃听信道的安全容量做了深入的研究,对研究主要结果可概括为:(1)针对中继窃听信道中,由于中继模式单一所导致的安全容量可能降低的问题,提出了基于多中继节点协作的联合中继传输机制。在所提出的机制中,多个中继节点根据网络环境,分别负责转发和协作干扰工作,从而达到在提升安全容量的目标;(2)针对协作干扰信号对合法接受者产生有害影响而使网络安全容量降低的问题,提出了基于极化滤波技术的DF-CJ混合传输机制传输机制。在所提出的机制中,中继节点和合法用户接受者能够通过极化滤波技术消除合法接受者端的干扰信号,从而进一步提升网络的安全容量。除此之外,通过引入计划天线,一个中继节点可同时具有转发和协作干扰双重功能。该特点能够为安全信息传输提供了更多的传输策略选择,提高了系统对网络环境的适应能力;(3)最后,针对所提出的DF-CJ混合传输机制,分析了两阶段信号传输过程,并建立了以安全容量为目标的最优化问题模型,并通过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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN918
本文编号：2246772
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN918
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