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
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.
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.
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2015, Vol. 55 
