摘要
针对交叉共享方式下的两跳协作感知网络,研究了多个感知用户的协作感测策略,推导了在放大转发传输协议下感知系统的中断概率表达式,并提出了一种联合优化方案.在保证一定频谱感测性能指标的前提下,通过联合优化感测门限、感测时长等参数最小化感知系统的中断概率.理论分析与仿真结果表明,此优化方案能有效改善感知系统的中断性能,提升感知网络传输的可靠性.
By investigating the two-hop cooperative cognitive network in an overlay sharing（OS） mode,a cooperative detection strategy for the multiple cognitive user system is considered and outage probability formulation on the Amplify-and-Forward（AF） protocol is deduced.By optimizing the parameters such as sensing time and threshold,an optimization scheme has been proposed,which is proven to minimize the outage probability on the premise of guaranteeing fixed detection performance.Theoretical analysis and simulation result show that the optimal scheme can improve outage performance of the cognitive system and enhance transmission reliability of the cognitive network.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2013年第1期177-182,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(60872157)
云南省社会发展科技计划资助项目(2009CA027)
云南省科技厅应用基础研究计划资助项目(2011FB035)
云南省应用基础研究计划资助项目(KKSY201203029)
关键词
感知无线电
交叉共享
协作感测
协同传输
中断概率
cognitive radio
overlay sharing
cooperative sensing
cooperative transmission
outage probability
