基于能量收集和人工加扰的认知无线电网络安全中断性能分析

Secrecy Outage Performance of Cognitive Radio Networks with Energy Harvesting and Artificial Jamming

基于能量收集中继的认知无线电网络,研究了存在一个窃听者的情况下系统的物理层安全问题。考虑一个两跳的通信网络,包括一个能量收集中继,采用时间切换策略从次级网络无线电传输中获取能量,中继采用解码转发协议向目的端转发机密信息。如果中继解码失败,则采用源到目的地的直接链路通信。此外,在向合法接收节点和非合法接收节点发送消息信号的同时,发送干扰信号以降低窃听链路的容量。对底层模式下认知网络的安全中断概率进行,分析了干扰阈值、能量采集时间、功率分配因子、目标数据速率和目标安全速率对该网络安全中断概率的影响。

The physical layer security in terms of secrecy outage of an energy harvesting(EH)relay-based underlay cognitive radio network in the presence of an eavesdropper is examined.A dual-hop communication network consisting of an energy harvesting relay that harvests energy from radio transmission of secondary user network by using a time switching relay scheme is explored.The relay works in decode and forward mode,and forwards the confidential message to the destination if it is successfully decoded at the relay.The advantage of the direct link from source to destination is exploited if the relay link is in outage.Furthermore,while the message signal is simultaneously transmitted to the legitimate nodes and illegitimate node,the jamming signal is also sent,so as to degrade the capacity of eavesdropping links.SOP(secrecy outage probability)of cognitive network under underlying mode is evaluated,and the impacts of interference threshold,energy harvesting time,power allocation factor,target data rate,target secrecy rate and direct link on SOP of this proposed network are investigated and explored.