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arXiv 0901.3130cs.ITmath.IT
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低信噪比下的保密通信:能量-保密性权衡的一个特征

Secure Communication in the Low-SNR Regime: A Characterization of the Energy-Secrecy Tradeoff

Mustafa Cenk Gursoy

摘要:

研究了低信噪比条件下多天线窃听信道的保密容量。推导了在SNR = 0时保密容量对SNR的一阶和二阶导数的表达式。确定了实现这些衍生物所需的传输策略。特别地,在低信噪比情况下,在最大特征值特征空间H_m * H_m-N_m/N_e H_e * H_e中传输是最优的,其中H_m和H_e分别表示与合法接收者和窃听者相关的信道矩阵,N_m和N_e分别表示接收者和窃听者处的噪声方差。通过找到安全可靠通信所需的最小比特能量以及宽带斜率来分析能量效率。在保密约束下增加的比特能量需求被量化。最后,衰落的影响进行了研究。

英文摘要:

Secrecy capacity of a multiple-antenna wiretap channel is studied in the low signal-to-noise ratio (SNR) regime. Expressions for the first and second derivatives of the secrecy capacity with respect to SNR at SNR = 0 are derived. Transmission strategies required to achieve these derivatives are identified. In particular, it is shown that it is optimal in the low-SNR regime to transmit in the maximum-eigenvalue eigenspace of H_m* H_m - N_m/N_e H_e* H_e where H_m and H_e denote the channel matrices associated with the legitimate receiver and eavesdropper, respectively, and N_m and N_e are the noise variances at the receiver and eavesdropper, respectively. Energy efficiency is analyzed by finding the minimum bit energy required for secure and reliable communications, and the wideband slope. Increased bit energy requirements under secrecy constraints are quantified. Finally, the impact of fading is investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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