摘要
已有研究结果表明,机会中继可以获得与更为复杂的空时编码协作通信相同的分集增益。但是,随着可选中继节点数的增多,发生冲突从而导致选择失败的概率也明显变大。本文提出了一种改进的最佳中继选择算法,源站收到最佳中继发出的标志分组后发送选择确认消息,中继节点在冲突发生后进行退避。分析结果证明,采用新算法可以大大降低选择失败的概率,而增加的开销却很小。
It has been proved that opportunistic relaying achieves the same diversity gain as the more complex space- time coding. However, the failure probability of the best relay selection may become unacceptable when the number of relays increase. We propose a modified practical relay selection scheme in this paper. The source sends an acknowledgement when it receives the best relay＇s flag information, the contending relays will retreat when collision occurs. The results show that the failure probability of relay selection is reduced obviously with a little extra overhead.
出处
《中国新通信》
2009年第3期26-29,共4页
China New Telecommunications
关键词
协作分集
中继选择
最佳中继
cooperative diversity, relay selection, best relay
