有源智能反射面辅助的无线安全网络能效优化

Energy Efficiency Optimization of Wireless Security Network Assisted by Active Intelligent Reflector

由于“双重衰落”效应,使得含有IRS系统的链路传输过程面临两段较大的链路损耗,为了解决该效应,引入有源IRS辅助系统安全。基于此提出了物理层安全领域下有源IRS辅助系统安全保密能量效率优化问题,并考虑用户保密速率约束、基站发射功率约束、IRS功率约束以及反射原件放大系数约束。为了解决该多变量耦合的非线性优化问题,采用交替优化技术、Dinkelbach方法、SDR技术联合处理。对比有源IRS、无源IRS以及无IRS辅助三种方案,仿真结果显示,所提出的有源IRS辅助方案能够达到更好的保密能效,从而使系统安全性得到保证。

Due to the"double fading"effect,the link transmission process of a system containing Intelligent Reflecting Surface(IRS)faces two large link losses.In order to solve this effect,an active IRS assistant system is introduced.Based on this,the security energy efficiency optimization problem of active IRS auxiliary system in the field of physical layer security is proposed,and the user security rate constraint,base station transmission power constraint,IRS power constraint and reflection element amplification factor constraint are considered.In order to solve the nonlinear optimization problem of multi-variable coupling,alternate optimization technique,Dinkelbach method and SDR technique are used to deal with it.Compared with active IRS,passive IRS and no IRS,the simulation results show that the proposed active IRS assistant scheme can achieve better security efficiency,so as to ensure the system security.