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中文摘要：
针对星地协作系统中继节点间的不公平性,提出一种基于放大转发（AF）模式的分布式中继选择策略。对陆地移动卫星通信信道进行分析,得到系统中断概率的闭环表达式,通过引入调和因子平衡各节点被选作中继的概率,并利用AF模式将来自卫星和地面的中继节点信号进行最大比合并,从而均衡各中继节点的功率开销。仿真结果表明,与集中式中继选择策略和基于最佳路径的中继选择策略相比,该策略能有效提高星地协作系统的公平性,并降低计算复杂度。
英文摘要：
A distributed relay selection strategy based on Amplify and Forward（AF） mode is proposed for the unfairness between relay nodes in satellite-terrestrial cooperative system.It analyzes the Land Mobile Satellite（LMS） channel,evaluates the closed-form expression of the outage probability,and balances relaying probability by finding the corresponding weight coefficient which is introduced to achieve the required fairness for each relay node.By AF mode,signals from the satellite and terrestrial relay are combined through Maximum Ratio Combining（MRC）,thereby balancing the power overhead of each relay node.Simulation results show that the proposed strategy can improve the required fairness and reduce computational complexity compared with the centralized relay selection strategy and the relay selection strategy based on best path.
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