多源-多中继协作通信的中继选择与功率分配  

Relay Selection and Power Allocation Based on Multi-Source Multi-Relay Cooperative Communication

作　　者：肖海林[1,2] 胡悦[2] 闫坤 韦文生[1] 

机构地区：[1]温州大学物理与电子信息工程学院,浙江温州325035 [2]桂林电子科技大学认知无线电与信号处理教育部重点实验室,广西桂林541004

出　　处：《北京邮电大学学报》2017年第2期73-78,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61472094;61261018);东南大学移动通信国家重点实验室开放研究基金项目(2015D05);广西自然科学基金杰出青年基金项目(2014GXNSFGA118007)

摘　　要：针对多中继协作通信带来的中断性能差与高能耗问题,在N个源节点的混合译码放大转发网络中,提出了一种基于多源-多中继协作通信的中继选择与功率分配方案.该方案将空闲时的N-1个源节点当作"中继节点","中继节点"根据信道统计特性值自适应地降序排列,选取M个"中继节点"组成最优中继集合.当中断概率一定时,根据信噪比门限判断被选择M个"中继节点"的协作方式,构造系统总功率Lagrange函数,通过Karush-KuhnTucker极值条件求得系统各节点的最小功率.数值分析结果表明,在传输速率为0.5~0.8 bit·s-1·Hz-1范围内,相比于放大转发方式下的多源-多中继协作通信的功率分配方案,该功率分配方案的总功率节省了9~22 d Bm,极大地减小了系统资源的消耗.In hybrid-decode-amplify-and-forward （HDAF） network with N source nodes, a joint relay selection and power allocation strategy for multi-source multi-relay cooperative communication is presented.The strategy takes N-1 idle source nodes as ＆quot;relay nodes＆quot; and minimizes outage probability and the total power as the goal, in which the channel statistical characteristic values are rearranged according to adaptively descending, and M ＆quot;relay nodes＆quot; are selected to form optimal relays set.Under certain outage probability, the cooperative approach of M selected relays is given by setting the signal-to-noise ratio threshold, the Lagrange function of total power is constructed, and the extreme value method of Karush-Kuhn-Tucker is used to obtain the minimization each nodes transmission power.It is shown by simulation that, compared with amplify-and-forward power allocation strategy for multi-source multi-relay cooperative communication, the total power of the proposed HDAF power allocation strategy can reduce about 9~22 dBm in the range of 0.5~0.8 bit＆#183;s-1＆#183;Hz-1 transmission rate, that will minimize the energy consumption.

关 键 词：协作通信 混合译码放大转发 中断概率 中继选择 功率分配 

分 类 号：TN929.5[电子电信—通信与信息系统]