| 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 |
| 1. 清华大学电子工程系, 微波与数字通信国家重点实验室, 北京 100084; 2. 北京理工大学信息与电子学院, 北京 100081; 3. 清华大学信息科学与技术国家实验室, 北京 100084 |
| Mean physical-layer secrecy capacity in mobile communication systems |
| LI Tao1, ZHANG Yan2, XU Xibin3, ZHOU Shidong1,3 |
| 1. State Key Lab on Microwave and Digital Communications, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; 2. School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China; 3. Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China |
摘要:
| 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。 | |||
| 关键词 ：移动通信,物理层安全,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. | |||
| Key words：mobile communicationphysical-layer securitymean physical-layer secrecy capacity | |||
| 收稿日期: 2015-03-06 出版日期: 2015-12-01 | |||
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| 通讯作者:周世东,教授,E-mail:zhousd@tsinghua.edu.cnE-mail: zhousd@tsinghua.edu.cn | |||
| 引用本文: |
| 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. LI Tao, ZHANG Yan, XU Xibin, ZHOU Shidong. Mean physical-layer secrecy capacity in mobile communication systems. Journal of Tsinghua University(Science and Technology), 2015, 55(11): 1241-1245,1252. |
| 链接本文: |
| http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2015.21.013或 http://jst.tsinghuajournals.com/CN/Y2015/V55/I11/1241 |
图表:
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| 图１ 单蜂窝小区示意图 |
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| 图２ 上行信道中用户安全容量的中断概率 |
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| 图３ 用户在某个扇区等概分布,下行信道的平均物理层安全容量随窃听者位置的变化 |
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| 图４ 用户在某个扇区等概分布,上行信道的平均物理层安全容量随窃听者位置的变化 |
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