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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。
To improve the security of mobile communication system, the average physical layer security capacity when users move is studied. In the actual propagation environment, the user movement will lead to physical layer security capacity in a wide range of changes, so the legitimate user average physical layer security capacity to characterize the system’s secure communication performance. By analyzing the influence of eavesdropping position on the average physical layer security capacity, the distribution characteristics of average physical layer security capacity are obtained. According to the distribution characteristics, a plan to improve the average physical layer security capacity is proposed. The scheme ensures that the average physical layer security capacity of the user is not less than the specified value by limiting the existence area of the eavesdropper. The theoretical and numerical results show that the proposed scheme can effectively guarantee the average physical layer security capacity of mobile communication system.