非同分布衰落环境下最大链路选择方案及性能研究

发布时间：2018-05-19 14:56

本文选题：中继协作 + 缓冲区　；参考：《计算机工程与科学》2017年11期

【摘要】：通过对Nakagami-m衰落环境下缓冲中继协作最大链路选择方案(MLS)的中断和延迟性能的研究,得到了中断概率和平均分组延迟的闭式解析解以及相应的分集增益和编码增益。基于所得结果,给出了中断概率和平均分组延迟的数值分析,结果表明,非同分布衰落环境不仅严重地影响了MLS方案的分集增益和编码增益,而且使得各个中继节点处的平均分组延迟也不相同,系统极不稳定。为此提出了一种新颖的基于加权的MLS(W-MLS)方案,该方案一方面使信源-中继和中继-信宿链路等效功率分别相同;另一方面使中继-信宿链路等效功率略大于信源-中继链路等效功率,这样,不仅可以保证系统获得足够的分集增益,而且可以显著地降低平均分组延迟,使得各个中继节点处的平均分组延迟完全相同,提高了系统的稳定性。
[Abstract]:By studying the interrupt and delay performance of the buffer relay cooperative maximum link selection scheme in Nakagami-m fading environment, the closed analytic solutions of interrupt probability and average packet delay, as well as the corresponding diversity gain and coding gain are obtained. Based on the results obtained, numerical analysis of outage probability and average packet delay is given. The results show that the heterogeneous fading environment not only seriously affects the diversity gain and coding gain of MLS scheme. Moreover, the average packet delay at each relay node is different, and the system is extremely unstable. In this paper, a novel weighted MLS- W-MLS scheme is proposed. On the one hand, the equivalent power of source-relay and relay-host links is the same. On the other hand, the equivalent power of the relay-host link is slightly higher than that of the source-relay link, which not only ensures that the system can obtain sufficient diversity gain, but also significantly reduces the average packet delay. The average packet delay at each relay node is identical and the stability of the system is improved.
【作者单位】：西北师范大学计算机科学与工程学院;南京邮电大学江苏省无线通信重点实验室;
【基金】：国家自然科学基金(61261015,61561043) 甘肃省杰出青年基金(1308RJDA007)
【分类号】：TN929.5

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