物理层认证PHY-PCRAS应用于OFDM传输的性能分析

Performance Analysis of Physical Layer Challenge-response Authentication with OFDM Transmission

物理层认证是在无线物理层对通信用户身份的识别,与网络上层安全协议相结合进一步加强无线网络的安全性。文中基于物理层相位激励-响应认证方案(PHY-PCRAS),研究无线正交频分复用(OFDM)传输系统中,子信道频域相关性对认证性能的影响。针对3GPP标准中的典型Urban信道模型,采用随机时延推导OFDM子信道频域的相关性,并进行了仿真验证。仿真结果表明,子信道频域的相关性随着子信道间距的增大呈指数趋势减小,且相关性越小,PHY-PCRAS认证性能越好。文中还将PHY-PCRAS和另一种激励响应型物理层认证机制(PHY-CRAM)进行了对比,结果表明:即使子信道相关,PHY-PCRAS仍然接近理想的效果,比PHY-CRAM算法具有更好的认证性能。

The physical- layer authentication recognizes the identities of communication users in the wireless physical layer,and it combines the network upper security protocols to further strengthen the security of wireless networks. Based on physical layer challenge- response authentication scheme（ PHY- PCRAS）,the influence of sub- channels frequency domain correlation with wireless OFDM transmission on the authentication performance was studied. For the 3GPP typical Urban channel model,the random delay was adopted to deduce the correlation of OFDM frequency domain sub- channels,and verified it through the simulation. The simulation results showthat the frequency domain sub- channels correlation decreases exponentially with the increasing of sub- channel space,and the smaller the correlation is,the better the authentication performance of PHY- PCRAS is. Compared PHY- PCRAS with another physical layer challenge- response authentication mechanism（ PHY- CRAM）,the simulation results showthat even if sub- channels are related,PHY-PCRAS is still close to the ideal performance,better than the PHY- CRAM algorithm.