相对距离对人工噪声辅助安全传输的影响

Hao Deng, Huiming Wang, Yi Zhang, Qian Yang, Xueqin Jiang, Wenjie Wang
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引用次数: 0

摘要

本文研究了合法用户和窃听者的相对距离和大规模衰落对多输入单输出窃听信道中人工噪声(AN)辅助保密方案的影响。我们证明了AN并不总是提高可实现的遍历保密率(ESR),并提供了一个精确的信噪比(SNR)阈值,低于该阈值AN就不起作用。我们还导出了AN保密增益的近似封闭表达式,它被定义为带AN和不带AN的ESR之差。分析和数值结果验证了相对距离对信噪比阈值和AN保密增益的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The impact of relative distance on artificial-noise-aided secure transmission
In this paper, we investigate the impact of relative distance and large-scale fading of legitimate user and eavesdropper on the artificial noise (AN) assisted secrecy scheme in a multiple-input single-output (MISO) wiretap channel. We show that AN does not always improve the achievable ergodic secrecy rate (ESR), and provide an exact signal-to-noise ratio (SNR) threshold below which AN does not work. We also derive approximately closed-form expressions of AN secrecy gain, which is defined as the difference between the ESR with AN and without AN. Analytical and numerical results verify that the relative distance impacts greatly on the SNR threshold and the AN secrecy gain.
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