This paper investigates physical layer security (PLS) in the intelligent reflecting surface (IRS)-assisted multiple-user uplink channel. Since the instantaneous eavesdropper's channel state information (CSI) is unavailable, the secrecy rate can not be measured. In this case, existing investigations usually focus on the maximization of the minimum (max-min) of signal to interference plus noise power ratio (SINRs) among multiple users, and do not consider secrecy outage probability caused by eavesdroppers. In this paper, we first formulate the minimization of the maximum (min-max) secrecy outage probability among multiple users. The formulated problem is solved by alternately optimizing receiving matrix and phase shift matrix. Simulations demonstrate that the maximum secrecy outage probability is significantly reduced with the proposed algorithm compared to max-min SINR strategies, meaning our scheme has a higher security performance.
翻译:本文调查智能反射表面(IRS)协助的多用户上链接频道中的物理层安全(PLS) 。 由于即时窃听器的频道状态信息( CSI) 不存在, 无法测量保密率 。 在此情况下, 现有调查通常侧重于多个用户对干扰信号最小值( 最大值) 最大值( 最大值) 的干扰信号加上噪音功率( SIRS ), 不考虑窃听器造成的保密故障概率 。 在本文中, 我们首先将多个用户的最大( 最小值) 保密超值概率( 最小值) 设定为最小值 。 设定的问题可以通过替代优化接收矩阵和 分阶段转移矩阵来解决 。 模拟显示, 与最大值的 SINR 战略相比, 最大值的保密超值概率大大降低, 意味着我们的计划具有更高的安全性能 。