基于有限反馈的非可信中继系统的物理层安全性能分析

摘要

在基于有限反馈获得部分信道状态信息的条件下，研究了放大转发非可信中继系统的物理层安全传输技术。通过目的节点发送人工噪声干扰信息，使系统获得了正安全容量。推导了安全中断概率和传输中断概率的闭合表达式，分析了反馈比特数对系统安全性和可靠性的影响，进而提出了能同时兼顾系统安全性和可靠性的最优反馈比特数的自适应选择方案。%Under the condition of partial channel state information that is obtained from limited feedback,a physical layer se-curity transmission technique is investigated for amplify-and-forward untrusted relay systems,where the positive secrecy capacity is obtained through the artificial noise interference information transmitted by the destination node.Closedform expressions for security outage probability and transmission outage probability are derived,and the impacts of the number of feedback bits on security and reliability are analyzed.Furthermore,an adaptive selection scheme for the optimal number of feedback bits is proposed in order to si-multaneously satisfy both required security and reliability.