摘要
研究了认知多中继网络的中断性能优化方法,提出了认知节点发射功率最大值受限和主用户干扰功率受限条件下的最优功率分配(OPA)方法,优化设计感知时间使认知中继网络的中断性能最优。仿真结果表明,最佳功率分配方案的中断性能优于等功率分配(EPA)方案,且存在最佳的感知时间使认知多中继网络的中断性能最优,在高信噪比区域采用多个认知中继协作传输可有效提高认知无线电网络的中断性能。
In this paper, we investigate the optimization method of outage performance based on cognitive multi-relay networks, and propose optimal power allocation （OPA） method under the constraint of maximum of average transmit power of secondary users and the constraint of average interference power of primary user. Optimal sensing time is designed to minimize the outage probabili ty of cognitive multi-relay networks. Finally, we conduct deep experiments which show that the outage performance of OPA scheme is superior to that of equal power allocation scheme. And there exists an optimal spectrum sensing time to optimize the outage per formance of cognitive multi-relay networks. Furthermore, increasing the number of secondary relays can efficiently improve the out age performance of cognitive relay networks in high SNR region.
出处
《电子技术应用》
北大核心
2014年第5期111-114,共4页
Application of Electronic Technique
基金
云南省科技厅应用基础研究计划(2011FB035
KKS0201303017)
关键词
最优功率分配
等功率分配
频谱感知
协作传输
optimal power allocation
equal power allocation
spectrum sensing
cooperative transmission
