摘要
在解码转发协议的基础上,研究了全选中继策略和机会中继选择策略的中断概率性能,推导了瑞利衰落下的两种策略的中断概率精确闭式结果,给出了高信噪比时的中断概率近似表达式。通过理论分析和数值仿真结果得出:在信噪比足够高或在中继-目的信道性能优于源-中继的信道性能的情况下,这两种策略具有相同的中断概率性能;源-中继的信道性能比中继-目的节点的信道性能越好,全选中继策略的性能越优于机会中继选择策略的中断概率性能。
Outage probabilities of all relays selection scheme and opportunistic relaying selection scheme based on decode-and-forward （DF） protocol were analyzed. Especially, exact closed-form results of the outage probability for the two schemes over Rayleigh fading channels were derived. Further investigation of the outage performance was made and asymptotic expressions for outage probability were obtained in the high signal-to-noise ratio （SNR） regime. Theoretical analysis and numerical simulation results show that the outage results of the two methods are equal in high SNR or in the ease that the perfor-mance of relay-destination channels is better than that of source-relay channels. The outage performance of all relays selection scheme is better than that of opportunistic relaying selection scheme when the performance of channels from the source to relays is better than that of the channels form relays to the destination.
出处
《计算机科学》
CSCD
北大核心
2012年第10期69-72,共4页
Computer Science
基金
绵阳师范学院科研基金(MA2011A11)
国家发改委CNGI示范工程项目(CNGI-04-4-2D)
重庆市科技攻关计划项目(CSTC2009AB2167)
中央高校基本科研业务费专项资金(CDJXS11160001)资助
关键词
协作通信
解码转发
瑞利衰落
中断概率
中继选择
Cooperative communications, Decode-and-forward DF, Rayleigh fading, Outage probability, Relay selection
