Mean physical-layer secrecy capacity in mobile communication systems

LI Tao; ZHANG Yan; XU Xibin; ZHOU Shidong

doi:10.16511/j.cnki.qhdxxb.2015.21.013

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (11) : 1241-1245,1252. DOI: 10.16511/j.cnki.qhdxxb.2015.21.013

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Mean physical-layer secrecy capacity in mobile communication systems

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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.

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

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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

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