一种基于放大转发的中继选择策略  

Relay Selection Scheme in Cooperative Networks with Amplify-and-Forward Protocol

作　　者：惠鏸[1] 朱世华[1] 李国兵[1] 

机构地区：[1]西安交通大学电子与信息工程学院

出　　处：《西安交通大学学报》2008年第4期450-453,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(60372055);教育部高等学校博士学科点专项科研基金资助项目(20030698027)

摘　　要：针对传统多中继放大转发协作通信网络中所有潜在中继均参与协作,导致系统的低资源利用率问题,提出了一种中继节点选择策略.该策略以最小化系统中断概率为目标,引入了中继节点的选择门限,并据此逐一令低于门限的中继节点不参与协作,将其资源重新分配给其他节点,从而提高系统资源利用率.所提策略运算开销小,且选择门限只与中继节点数、平均信道增益以及当前系统信噪比有关,可在传输开始前事先确定而无需实时更新,从而节省了系统开销.仿真实验表明,与所有潜在中继都参与协作的方法相比,所提策略在中断概率为10^-2～10^-3时可获得约3～4 dB的信噪比增益.In order to avoid the resource inefficiency of all-participated cooperations in amplify- and-forward cooperative communication networks, a new relay selection scheme is proposed. A threshold for relay selection is introduced to minimize the outage probability and then relays below the threshold are excluded in turn from the cooperation so that their released resources can be reallocated to other relays to improve resource efficiency. The proposed scheme has low computation complexity and low system cost since the threshold is only determined by the number of the selected relays, the average channel state information and the signal-to-noise ratio, and can be given before transmission starts with no real-time updating. Simulation results show that the proposed relay selection scheme outperforms the conventional schemes in outage behavior.

关 键 词：协作通信 放大转发 中继选择 

分 类 号：TN925[电子电信—通信与信息系统]