基于反馈控制的分布式安全波束成型算法研究

发布时间：2018-01-23 07:39

本文关键词： 物理层安全分布式安全波束成型人造噪声单比特反馈　出处：《深圳大学》2017年硕士论文　论文类型：学位论文

【摘要】：近些年来,物理层安全技术受到广泛关注与研究,是未来通信系统中的关键技术之一。其基本思想是利用合法接收端较窃听端有更好的信号接收质量(如:信噪比),来实现安全通信。另外,传统的分布式波束成型技术经过多年的发展,已日趋成熟,但是针对安全通信的分布式波束成型技术仍是一个挑战。本学位论文主要研究基于物理层安全技术的分布式波束成型问题。在物理层安全技术研究的最新进展中,基于衰落窃听信道的研究成为热点。在这些研究中,绝大部分需要利用合法接收端将信道信息反馈给发射端。在实际应用中,发射端要获得准确的实时信道信息往往是十分困难的,这使得现有的物理层安全技术在实际应用中受到了很大限制。而引入误差的原因主要分为三大类:第一类、估计误差;第二类、延时;第三类、反馈链路容量受限。本学位论文提出了基于单比特反馈信息的分布式安全波束成型系统。在新系统中,合法接收端除了反馈单比特控制信息外,不需要反馈其它任何形式的信道信息,只需要较少的网络资源就能使得系统的安全容量得到提升。基于新系统,本学位论文设计出一个与之对应的分布式安全波束成型算法,称为分布式相位失配安全波束成型算法。新算法的优势如下:第一、利用合法接收端反馈的单比特信息来控制每个分布式发射节点发射人造噪声的相位,并通过连续负反馈与累加正反馈机制来提升算法的收敛速度,具有很高的实际应用价值;第二、新算法在分布式发射节点与合法收发端都引入了人造噪声,即使在窃听端装备多天线时,新算法仍可以干扰窃听端对信道方向信息的估计准确度,使得系统的安全容量得到进一步提升;第三、当通信环境存在信道漂移时,由于累加正反馈机制的作用,新算法可以追踪信道漂移,使得新算法在复杂通信环境中仍能实现分布式安全通信。最后,新算法在其参数选取上具有较好的鲁棒性。通过大量的仿真实验,本学位论文通过仿真实验对新算法进行了深入研究,证明了其有效性与优越性。
[Abstract]:In recent years, physical layer security technology has received extensive attention and research. It is one of the key technologies in the future communication system. Its basic idea is that the legitimate receiver has better signal reception quality than the eavesdropping terminal, such as signal-to-noise ratio (SNR), to achieve secure communication. The traditional distributed beamforming technology has become more and more mature after years of development. But the distributed beamforming technology for secure communication is still a challenge. This dissertation focuses on distributed beamforming based on physical layer security technology. . The research based on fading eavesdropping channel has become a hot topic. In these studies, most of them need to use the legitimate receiver to feedback the channel information to the transmitter. It is very difficult for the transmitter to obtain accurate real-time channel information. As a result, the existing physical layer security technology has been greatly restricted in practical application. The reasons for introducing errors are divided into three categories: first, estimation error; Second, delay; Third, the feedback link capacity is limited. In this dissertation, a distributed secure beamforming system based on single bit feedback information is proposed. In the new system, the legitimate receiver only feedback the single bit control information. There is no need to feedback any other form of channel information, only a small amount of network resources can improve the security capacity of the system based on the new system. This dissertation designs a corresponding distributed secure beamforming algorithm called distributed phase mismatch secure beamforming algorithm. The advantages of the new algorithm are as follows: first. The phase of artificial noise emitted by each distributed transmitting node is controlled by using the single bit information feedback from the legal receiver, and the convergence rate of the algorithm is improved by continuous negative feedback and cumulative positive feedback. It has high practical application value; Second, the new algorithm introduces artificial noise in both the distributed transmitting node and the legal transceiver. Even when the eavesdropping terminal is equipped with multiple antennas, the new algorithm can still interfere with the estimation accuracy of the channel direction information of the eavesdropping terminal. The security capacity of the system is further enhanced; Third, when the channel drift exists in the communication environment, the new algorithm can track the channel drift because of the effect of the cumulative positive feedback mechanism, so that the new algorithm can still achieve distributed security communication in the complex communication environment. The new algorithm has good robustness in the selection of its parameters. Through a large number of simulation experiments, this thesis makes a deep research on the new algorithm through simulation experiments, and proves its effectiveness and superiority.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN918

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