摘要
解码转发协议下的单中继选择策略通常包括:被动和主动两种机会中继策略.在存在直传路径的系统中,对于该两种中继选择策略性能比较研究较少.本文在选择性解码转发协议下,对该两种中继选择策略进行了进一步的研究,详细推导了该两种策略的中断概率的精确闭式结果,并给出了高信噪比范围时中断概率的近似表达式.通过理论分析和数值仿真得出,在低信噪比条件下或在高信噪比满足中继数目足够多的情况下,与主动机会中继策略相比较,被动机会中继的中断概率性能更优.
Generally, two single relay selection strategies, namely proactive and reactive opportunistic relay strategy, are included. In the system considered a direct transmission path, the performance comparison of these two schemes is less studied. In this paper, these two schemes are further investigated based on selective decode-and-forward （ SDF} protocol. Accurate closed-form expressions for the outage probability of the two relay selection schemes are derived in detail. In the high signal-to-noise ratio { SNR ） regime, ap- proximate results of the two strategies＇outage probability are also obtained. Theoretical analysis and numerical simulation results show that the outage probability performance of the reactive opportunistic relaying strategy is better than that of the proactive opportunistic relaying in the case of low SNR or having more the number of the relays in the high SNR regime.
出处
《小型微型计算机系统》
CSCD
北大核心
2014年第3期478-482,共5页
Journal of Chinese Computer Systems
基金
广东省自然科学基金项目(S2012010009961)资助
广州市教育科学规划课题(11A147)资助
关键词
协同通信
选择性解码转发
中断概率
中继选择
瑞利衰落
cooperative communications
selective decode-and-forward （ SDF }
outage probability
relay selection
Rayleigh fading
