时变OFDM系统中基于基扩展模型的物理层认证  

Physical-layer authentication based on basis expansion model in time-variant OFDM systems

作　　者：张金玲[1] 潘绯[1] 张争光[1] 章露萍 文红[1] 

机构地区：[1]电子科技大学通信抗干扰国家级重点实验室,四川成都611731

出　　处：《电子技术应用》2016年第12期97-99,共3页Application of Electronic Technique

基　　金：国家863项目(2015AA01A707);四川省科技支撑项目(2015GZ0090)

摘　　要：基于信道信息的物理层认证是一种对传统认证技术的有效补充和增强,实质上是利用了丰富的无线信道资源。提出一种适合解决时变情况下的物理层认证方法。在时变信道中,可分径的各个抽样值在块传输时间内存在相关性,基于基扩展模型的信道探测方法采用变化的相互正交的基函数结合不变的基系数来逼近该可分径的状态。因此,基于基扩展模型的信道探测方法的物理层认证算法能有效提高时变环境下认证准确率。通过在OFDM系统中进行的仿真实验,证明该认证方法的有效性,且相对于传统的LS信道探测的物理层认证,获得2~4 d B性能提升。Physical-layer authentication based on the channel information can be used to complement and enhance traditional authentication, which uses the wealth of the wireless channel resources essentially. In this paper,a physical layer authentication method is proposed to suit to time-variant wireless channels. Each sampling values of separable paths is related within a block transmission time in time-variant channels, and the channel detection method based on the basis expansion model takes advantage of the varied mutually orthogonal basis functions and the constant basis coefficients to approximate the state of separable paths. Therefore, the authentication accuracy can be improved using the channel detection method based on the basis expansion model for physical-layer authentication algorithm under time-variant conditions. Simulation experiments in orthogonal frequency division multiplexing （OFDM） system proves the validity of the authentication method and that it makes 2-4 dB improvement compared to the physical-layer authentication using conventional Least Square（LS） channel sounding.

关 键 词：基扩展模型 时变信道 物理层认证 OFDM系统 

分 类 号：TN929.53[电子电信—通信与信息系统]