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Cyclic feature suppression for physical layer security

机译：循环特征抑制可提高物理层的安全性

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摘要

Cyclic prefix (CP) deploying techniques such as orthogonal frequency division multiplexing (OFDM) and single carrier frequency domain equalization (SC-FDE) offer considerable advantages in terms of equalizing time dispersive effect of wireless channel at the expense of a reasonable spectral redundancy. However, CP introduces cyclic features to the signal which can also be exploited for signal interception, blind parameter estimation and synchronization, and therefore, compromises the security of the signal against eavesdropping attacks. In order to provide a covert communication against such attacks, in this paper, we present two novel techniques that suppress the cyclic features of the CP utilizing signals while maintaining their advantages in equalization without reducing spectral efficiency. The first technique is built on a CP selection strategy while the second one is based on randomizing the symbol time. We also performed peak-to-average power ratio mitigation and out-of-band leakage suppression along with the cyclic feature concealing in the second technique at the expense of a reasonable complexity and signaling. Subsequent to the presentation of the proposed techniques, their performances are discussed and compared for OFDM and SC-FDE in terms of complexity and bit-error-rate along with cyclic feature suppression.1
机译：诸如正交频分复用（OFDM）和单载波频域均衡（SC-FDE）之类的循环前缀（CP）部署技术在均衡无线信道的时间分散效应方面以牺牲合理的频谱冗余为代价提供了相当大的优势。但是，CP向信号引入了循环特征，这些循环特征也可用于信号拦截，盲参数估计和同步，因此会危及信号的安全性，防止窃听攻击。为了提供针对此类攻击的秘密通信，在本文中，我们提出了两种新颖的技术，可利用信号抑制CP的循环特征，同时在不降低频谱效率的情况下保持其均衡优势。第一种技术基于CP选择策略，而第二种技术则基于随机化符号时间。我们还以合理的复杂度和信令为代价，执行了峰均功率比缓解和带外泄漏抑制以及第二种技术中隐藏的循环特征。在介绍所提出的技术之后，就复杂性和误码率以及循环特征抑制方面，讨论并比较了OFDM和SC-FDE的性能。1

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