认知无线电网络中的动态权值频谱切换判定算法  

Spectrum handoff decision algorithm with dynamic weights for cognitive radio networks

作　　者：谢显中[1] 杨光[1] 马彬[1] 

机构地区：[1]重庆邮电大学宽带接入网络研究所,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2012年第1期1-7,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(60872037);重庆市自然科学基金(CSTC 2010BB2415;CSTC 2011JJA40006);重庆市教委科学研究计划基金(KJ110530)~~

摘　　要：为了克服认知无线电网络中衬垫传输覆盖范围的限制,基于对衬垫传输范围的估计,提出了多小区的频谱切换机制。当认知用户超出衬垫传输范围时,采用动态权值调整的简单加权判定算法选择最优目标小区,进行频谱切换,继续保持数据传输。理论分析和仿真结果表明,该方案和算法能够降低认知用户的切换失败概率和服务中断概率,提高认知用户的服务质量。To overcome the problem of coverage of underlay in cognitive radio networks,a multi-cell spectrum handoff scheme based on evaluation of coverage of underlay is proposed.Simple additive weights decision algorithm with dynamic weights（SAW-DW） in spectrum handoff is used to select a best target cell for continuing data transmission when secondary users exceed underlay constraint.Theoretical analysis and simulation results show that the scheme and algorithm can reduce probability of handoff failure and probability of service interrupt of secondary users and improve quality of service of secondary users.

关 键 词：认知无线电 频谱切换 衬垫传输 判定算法 动态权值 

分 类 号：TN929.5[电子电信—通信与信息系统]