移动通信系统平均物理层安全容量

李涛, 张焱, 许希斌, 周世东

清华大学学报（自然科学版） ›› 2015, Vol. 55 ›› Issue (11) : 1241-1245,1252.

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清华大学学报（自然科学版） ›› 2015, Vol. 55 ›› Issue (11) : 1241-1245,1252. DOI: 10.16511/j.cnki.qhdxxb.2015.21.013
电子工程

移动通信系统平均物理层安全容量

  • 李涛1, 张焱2, 许希斌3, 周世东1,3
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Mean physical-layer secrecy capacity in mobile communication systems

  • LI Tao1, ZHANG Yan2, XU Xibin3, ZHOU Shidong1,3
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摘要

为提升移动通信系统的安全性,研究了用户移动时的平均物理层安全容量。在实际传播环境中,用户移动会导致物理层安全容量在大范围内变化,因此提出合法用户平均物理层安全容量以刻画系统的安全通信性能。通过分析窃听者位置对平均物理层安全容量的影响,得到了平均物理层安全容量的分布特征。根据分布特征,提出了一种改善平均物理层安全容量的方案。该方案通过限制窃听者存在区域,保证用户平均物理层安全容量不低于指定值。理论和数值分析结果表明:所提方案可以有效地保障移动通信系统的平均物理层安全容量。

Abstract

The security of mobile communication systems depends on the mean physical-layer secrecy capacity as the user moves. In realistic propagation environments, the physical-layer secrecy capacity varies over a vast range because of the user motion. A mean physical-layer secrecy capacity of a legitimate user is defined to characterize the secure communication performance of the system. The distribution characteristics of the mean physical-layer secrecy capacity are derived based on the impact of the eavesdropper's position on the mean physical-layer secrecy capacity. A scheme is then given to improve the mean physical-layer secrecy capacity according to the distribution characteristics. The mean physical-layer secrecy capacity can be made to be not lower than a specified value by limiting the eavesdropper's positions. Theoretical and numerical results demonstrate that this scheme can effectively guarantee the mean physical-layer secrecy capacity in mobile communication systems.

关键词

移动通信 / 物理层安全 / 平均物理层安全容量

Key words

mobile communication / physical-layer security / mean physical-layer secrecy capacity

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李涛, 张焱, 许希斌, 周世东. 移动通信系统平均物理层安全容量[J]. 清华大学学报（自然科学版）. 2015, 55(11): 1241-1245,1252 https://doi.org/10.16511/j.cnki.qhdxxb.2015.21.013
LI Tao, ZHANG Yan, XU Xibin, ZHOU Shidong. Mean physical-layer secrecy capacity in mobile communication systems[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(11): 1241-1245,1252 https://doi.org/10.16511/j.cnki.qhdxxb.2015.21.013
中图分类号： TP929.5   

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