一种多源协作网络的分布式功率分配与中继选择算法  

Power Allocation and Relay Selection in Multi-source Cooperative Networks

作　　者：惠鏸[1,2] 朱世华[1] 吕刚明[1] 孙晓东[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049 [2]西安理工大学自动化与信息工程学院,西安710048

出　　处：《电子与信息学报》2010年第10期2446-2451,共6页Journal of Electronics & Information Technology

基　　金：国家863计划重点项目(2009AA011502);国家自然科学基金(60872028,60902043)资助课题

摘　　要：该文针对多源-多中继放大转发协作通信网络,以最小化系统总功率为目标,在保证系统满足一定中断概率的前提下,提出了一种分布式功率分配与中继选择算法。算法由源节点自主选择为其转发信息的中继节点,并引入定时器,通过竞争方式避免了分布式所导致的中继选择冲突。中继收到来自源节点的信号后,只需根据转发门限自主判断是否进行转发,从而完成传输。仿真结果表明该分布式算法能够有效降低传输所需要的总发射功率。并且与集中式控制所获得的最优中继选择与功率分配算法相比性能相近,但所提分布式算法显著降低了系统的控制开销。In order to minimizing the total transmit power while guaranteeing the outage performance at the same time,in this paper a distributed power allocation and relay selection scheme is proposed for amplify-and-forward cooperative networks with multiple sources and multiple relays.In the proposed scheme,sources select their relays independently,and introduce channel-related timers to compete for their preferred relay.Then the selected relays independently determine whether to forward the messages or not according to a forwarding threshold.Simulation results show that the proposed scheme can reduce the total transmit power of the network significantly and has a similar performance to the optimal central-controlled scheme with a much lower overhead.

关 键 词：协作通信 放大转发 多源协作 中继选择 功率分配 

分 类 号：TN925[电子电信—通信与信息系统]