| 引用本文： |
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吴越梅,魏冬,黄伟庆,张巧遇,李静.时不变信道下基于信道极化响应的物理层认证[J].信息安全学报,已采用 [点击复制]
- WU Yuemei,WEI Dong,HUANG Weiqing,ZHANG Qiaoyu,LI Jing.Physical Layer Authentication Based on Channel Polarization Response in Time-invariant Channels[J].Journal of Cyber Security,Accept [点击复制]
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| 摘要: |
| 身份认证是现代无线系统安全通信的一个关键要求。与上层加密认证相比，物理层认证由于利用物理层本质特性认证发送方，有着高安全性、低计算复杂度以及高兼容性的优点。现阶段关于基于信道的物理层认证研究主要集中在基于信道脉冲响应(channel impulse response, CIR)和信道频率响应(channel frequency response, CFR)的方案。然而这些方案有以下不足：第一，认证性能依赖于导频信号长度和密度并与其成正比，而通过增大导频信号长度和密度来提高认证性能会带来大的通信开销；第二，认证前需要对接收信号进行同步和解调，当接收信号来自非法发送方时，会带来不必要的资源开销；第三，CIR和CFR只反映了信道中散射体的空间分布特性。为了有效克服以上不足，本文提出了一种基于信道极化响应(channel polarization response, CPR)的物理层认证方案。CPR表征了散射体的本质物理属性，相比于CIR和CFR刻画了更细粒度的信道信息，此外CPR可以直接从接收信号极化状态中估计，不需要同步、解调等。我们使用频率相关的对数极化比表征CPR，并使用统计信号处理、矩阵分析和假设测试，建立时不变信道下基于CPR的认证方案，此外理论推导了所提方案的错误报警概率、检测概率、最优阈值以及计算复杂度。通过大量的仿真实验，验证了所提方案的理论正确性和在时不变信道下的有效性。仿真结果表明，在相同的信道条件下，所提方案相比于基于CFR的方案认证精度更高、计算复杂度更低，并且在低信噪比下仍可以取得高的认证精度。 |
| 关键词: 物理层认证 无线安全 时不变衰落信道 信道极化响应 信道频率响应 |
| DOI：10.19363/J.cnki.cn10-1380/tn.2024.02.15 |
| 投稿时间：2022-01-14修订日期：2022-03-10 |
| 基金项目: |
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| Physical Layer Authentication Based on Channel Polarization Response in Time-invariant Channels |
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WU Yuemei, WEI Dong, HUANG Weiqing, ZHANG Qiaoyu, LI Jing
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| (School of Cyberspace Security,University of Chinese Academy of Sciences) |
| Abstract: |
| Authentication is a key requirement for secure communication in modern wireless systems. Compared with the upper-layer authentication scheme based on encryption technology, physical layer authentication has the advantages of low computational complexity, high security, and good compatibility, since it exploits intrinsic and unique features of the physical layer to authenticate the transmitter. At present, the researches on physical layer authentication mainly focus on the schemes based on channel impulse response (CIR) and channel frequency response (CFR). However, those schemes have three limitations. First, the authentication performance depends on and is proportional to the length and density of the pilot signal, but increasing the length and density of the pilot signal to improve the authentication performance will bring large communication overhead. Second, the received signal needs to be synchronized and demodulated before authentication. When the received signal comes from an illegal transmitter, it will bring unnecessary resource overhead. Third, the CIR and CFR reflect the spatial distribution of scatterers in the channel. In this paper, we propose a physical layer authentication scheme based on channel polarization response (CPR) to effectively overcome the aforementioned limitations. The CPR represents the essential physical properties of the scatterer and depicts finer channel information than CIR and CFR. In addition, CPR can be directly estimated from the polarization state of the received signal without synchronization and demodulation. Using statistical signal processing, matrix analysis and hypothesis test, we establish a CPR based authentication model in time invariant channel, and theoretically deduce the false alarm probability, detection probability, optimal threshold, and computational complexity of the scheme. Through extensive simulation experiments, the theoretical correctness and effectiveness of the proposed scheme in time-invariant channel are verified. Simulation results show that under the same channel, the proposed scheme has higher authentication accuracy and lower computational complexity than CFR based schemes, and can still achieve high authentication accuracy under low SNR. |
| Key words: physical layer authentication wireless security time-invariant fading channel channel polarization response channel frequency response |
