摘要
针对放大转发协作网络多跳中继节点位置对系统性能的影响,分析了端到端链路的误码率.根据误码率并通过设定不同节点间距离来确定最优中继位置.针对多跳中继网络,提出了基于信道状态信息的节点选择算法,在不同的选取准则下以最小值最大化为目标.为了考虑中继位置,进而提出基于节点位置信息的中继节点选择算法,确保选择一个最低误码率的节点为协作节点.仿真结果表明,多跳中继最优位置处于源节点和目的节点的中点处.与已有放大转发模式下的单跳中继相比,多跳中继在系统具有较低的总传输功率时具有更好的性能.
In this paper, we analyze the symbol error rate (SER) for end-to-end link in amplify-and-forward (AF) cooperative networks. An optimal relay position is made by setting the distance between nodes. A multi- hop relay selection algorithm based on channel state information (CSI) is proposed, which is the expansion of single-hop relay selection to ensure the lowest SER of the cooperative node. A multi-hop relay selection algorithm based on node position is then investigated according to the impact of node position on system performance. Simulation results indicate that the optimal multi-relay position is at the midpoint between the source and destination nodes, and the multi-hop method provides significant performance gain in terms of total energy over the exiting AF relay selection algorithms.
出处
《应用科学学报》
EI
CAS
CSCD
北大核心
2012年第5期479-486,共8页
Journal of Applied Sciences
基金
国家自然科学基金(No.61071118
No.60702055)
重庆市科委杰出青年科学基金
重庆市科委重点实验室专项经费基金(No.CSTC2009BB2279)资助
关键词
放大转发
中继位置
信道状态信息
中继选择
误码率
amplify-and-forward, relay location, channel state information (CSI), relay selection, symbol errorrate (SER)