摘要： 基于非最佳用户级联（UC）方案，研究多层异构网络（HetNets）的物理层安全性能。利用随机几何运算将网络节点建模为齐次泊松点过程，并借助概率统计数学工具，推导出多层HetNets的系统安全概率表达式，分析发射功率、安全门限及窃听者密度对系统安全概率的影响。仿真结果表明，当基站发射功率较小时，非最佳UC方案的安全性能优于传统最佳UC方案，当基站发射功率较大时，两者安全性能趋于相同，且非最佳UC方案下的系统安全概率随着发射功率的增大先减小后增大，稳定性更高。

关键词: 异构网络, 用户级联, 平均偏置接收功率, 齐次泊松点过程, 随机几何, 安全性能

Abstract: Based on the non-optimal User Cascade(UC) scheme,the physical layer security performance of multi-layer Heterogeneous Networks(HetNets) is studied.The network nodes are modeled as homogeneous Poisson Point Process(PPP) by using stochastic geometry operations,and the system security probability expression of multi-layer HetNets is derived by means of probability and statistics mathematical tools.The influence of transmission power,security threshold and eavesdropper density on the system security probability is analyzed.Simulation results show that when Base Station(BS) transmission power is relatively small,the security performance of the non-optimal UC scheme outperforms the traditional optimal UC scheme.When transmission power is relatively large,the security performance of the two schemes tends to be the same.Then,the system security probability of the non-optimal UC scheme decreases first and then increases with the increase of the transmit power,and the stability is higher.

Key words: Heterogeneous Networks(HetNets), User Cascade(UC), Average Biased Received Power(ABRP), homogeneous Poisson Point Process(PPP), stochastic geometry, security peformance

中图分类号: 

• TN929.5