分布式环境中协作分集的移动中继动态选择和切换策略研究  

Selection and handoff Scheme of mobile Relay in Distributed Cooperative Wireless Networks

作　　者：谢显中[1] 张鑫[1] 雷维嘉[1] 

机构地区：[1]重庆邮电大学个人通信研究所,重庆400065

出　　处：《信号处理》2011年第3期387-394,共8页Journal of Signal Processing

基　　金：国家自然科学基金(60872037);重庆市自然科学基金(2008BB2411);重庆市教委应用基础研究基金(KJ080508)资助

摘　　要：在协作无线通信系统中,中继节点的移动会大大降低系统的性能,目前该方面的结果很少。本文探讨分布式环境中协作分集的移动中继选择算法,在放大转发(AF)协作通信模式下,给出了基于信道统计状态信息的功率分配和中继的动态选择策略。针对单中继情况提出了中继切换方案,针对多中继情况提出了动态剔除、补充中继的方案,并导出了分集增益及系统容量的计算公式。通过模拟仿真分析,该方案能有效的降低中断概率,提高系统分集增益,扩大系统容量,实现良好的整体性能。The mobility of the cooperative relay will greatly affect the performance of a cooperative system.Selection and handoff scheme of mobile relay is of great importance in distributed cooperation wireless networks.The paper proposes a mobile relay selection scheme under amplify-and-forward mode based on average channel gain to minimize the outage probability.For a single relay scenarios the handoff scheme is given.For other situations（multiple relay） the relay selection scheme is used to eliminate and add relays automatically so as to maintain the reliability of the cooperative mobile relay system.Simulation results show that the proposed relay handoff and selection scheme effectively reduces the outage probability,increases the diversity gain and system capacity to achieve the integrity of the well organized system.

关 键 词：协作分集 移动中继选择 信道增益 切换 

分 类 号：TN911.22[电子电信—通信与信息系统]