无线传感器网络中基于多用户协作的物理层安全研究
关键词 分布式无线系统 物理层安全 协同通信 保密率
毕业设计说明书（论文）外文摘要
Title Research of cooperation-based physical layer security in wireless networks
Abstract
The physical layer security technology exploits the channel fading and noise signal during wireless transferring, to secure the information's transmission on the physical layer. In order to receive the source information more effectively and safely, the channel's quality between source and destination should be improved which based on the collaborative technology of the relay node. This paper first studies two basic collaborative technology - Cooperative Relaying and Cooperative Jamming，and also compare their performance. Based on research above，this paper pays attention to a hybrid scheme with relaying and jamming, which be analyzed of the application environment to maximize the advantages. With the hybrid scheme with relaying and jamming, the transmission power of the repeater is pided into two parts: one transports the information signals, the other transports the jamming signal. The hybrid scheme with relaying and jamming could improve the privacy rate of wireless communication system. However, in the same time, the requirement of hardware and the cost of application are both higher than using of a single strategy.
Keywords Distributed wireless systems; Physical layer security; Cooperative communication; Secrecy rate
目 次
1 绪论 1
1.1选题的背景与意义 1
1.2 国内外研究现状 1
1.3 论文的重要工作及安排 2
2 基本协同策略 4
2.1 直接传输 4
2.2 协同中继 4
2.3 协同干扰 6
3 协同中继与协同干扰的比较 7
3.1系统模型 7
3.2多天线中继节点的发送策略比较7
3.3 数值结果和分析 10
4 混合协同策略的性能分析 15
4.1 混合协同策略的算法设计 15
4.2 各种环境因素对混合协同策略性能的影响16
4.3 混合协同策略性能的适用范围 19
结论 20
致谢 21
参考文献22
1 绪论
1．1 选题的背景与意义
随着现代社会科学技术发展的日新月异，人们对于数据和信息的要求以及依赖程度也逐渐增强。通信网络的规模也在逐年扩大，为了保证覆盖率无线通信逐渐成为了国家信息基础建设的重要组成部分。
安全通信的目的是：在使源节点所发出信息信号可以被目的节点接收、并成功解调的同时窃听者无法得到有用信息。
传统的保密通讯主要是以密码学为基础的加密技术，主要是建立在计算量的基础上。只是随着计算机技术的发展，计算机运算能力呈指数增长，应用于网络层及以上各层的加密技术逐渐遇到瓶颈。这时应用于物理层的安全技术逐渐得到学者的关注，作为上层加密技术的补充出现，极大地增强了整个系统的安全性能。