Blind Authentication at the Physical Layer Under Time-Varying Fading Channels
Blind Authentication at the Physical Layer Under Time-Varying Fading Channels
复制标题
时变衰落信道下物理层盲认证
DOI：
10.1109/jsac.2018.2824583
复制
发表时间：
2018-07-01
影响因子：
16.4
通讯作者：
Zhang, Shengli
中科院分区：
文献类型：
--
作者：
Xie, Ning;Zhang, Shengli
身份验证是现代无线系统中安全通信的关键要求。与使用加密工具的传统上层认证相比，物理层认证具有许多优点，包括通过向对手引入不确定性来增强安全性，以及通过避免上层操作来提高效率和兼容性，特别是在异构共存环境中，例如5G无线系统。本文研究时变衰落信道下的物理层认证问题。传统的物理层认证方案在快速衰落或频率选择性衰落信道下的性能较差。此外，传统的方案需要额外复杂的预处理，如信道估计和通过解调和解码恢复消息符号。本文提出了一种新的物理层盲认证方案，该方案将盲已知干扰消除（BKIC）和差分处理技术相结合，在不需要任何上述预处理的情况下实现认证。该方案利用平滑（SM）技术和信念传播（BP）技术，通过在导频（bsup）上叠加标签的不同盲认证方案（分别称为BSUP-SM和BSUP-BP）来实现BKIC。该方案不仅能有效抑制衰落信道的恶化效应，而且对不知情用户具有隐蔽性、抗干扰性和身份验证安全性。讨论和分析了使用所提出的系统对各种目标的权衡。BSUP-SM方案的性能取决于信道衰落和导频簇的长度，而BSUP-BP方案的性能对上述因素不敏感，而是取决于所采用的量化步长。BSUP-BP方案在快速衰落信道中，即使在频率选择性衰落信道中，也能很好地工作。
Authentication is a key requirement for secure communications in modern wireless systems. Compared with the conventional authentication at the upper layer using a cryptographic tool, authentication at the physical layer has many advantages, including enhanced security through the introduction of uncertainty to adversaries and increased efficiency and compatibility through the avoidance of operations at the upper layer, particularly in heterogeneous coexistence environments, e.g., 5G wireless systems. In this paper, we investigate authentication at the physical layer under time-varying fading channels. Conventional authentication schemes at the physical layer operate poorly under fast fading or frequency selective fading channels. Furthermore, conventional schemes require additional complicated preprocessing such as channel estimation and message symbol recovery through demodulation and decoding. This paper proposes a new blind authentication scheme at the physical layer that combines the techniques of blind known interference cancellation (BKIC) and differential processing to implement authentication without requiring any of the above-described preprocessing. The proposed scheme utilizes both the smoothing (SM) technique and belief propagation (BP) technique to achieve BKIC through the distinct blind authentication schemes with a superimposed tag over pilots (BSUPs) referred to, respectively, as BSUP-SM and BSUP-BP. The proposed scheme not only effectively suppresses the deteriorate effect of fading channels without any additional preprocessing but is also covert to unaware users, robust to interference, and secure for identity verification. The tradeoffs of using the proposed system with respect to various goals are discussed and analyzed. The performance of the BSUP-SM scheme depends on the channel fading and the length of the pilot cluster, while the performance of the BSUP-BP scheme is not sensitive to the above factors but depends instead on the quantization step used. The BSUP-BP scheme works well in fast fading channels, even in frequency selective fading channels.