Outage performance analysis for buffer-aided relay system over non-identical Rayleigh fading channels
Outage performance analysis for buffer-aided relay system over non-identical Rayleigh fading channels
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DOI：
10.1049/iet-com.2015.0222
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发表时间：
2015-10
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影响因子：
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通讯作者：
Xiangdong Jia;Pengfei Deng;Dan Wang;Longxiang Yang;Hongbo Zhu
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文献类型：
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作者：
Xiangdong Jia;Pengfei Deng;Dan Wang;Longxiang Yang;Hongbo Zhu
为了深入了解信道参数对缓冲器辅助中继选择系统的影响，研究了独立非同分布瑞利衰落信道下的最大链路选择（MLS）方案.特别地，作者首先利用马尔可夫链对状态转移矩阵和中断概率进行建模。其次，得到了相应统计性质的封闭表达式。所呈现的结果显示：（i）当中继信道不对称时（但源-中继链路是独立同分布的衰落，中继-目的地链路也是如此），MLS方案优于传统的最佳中继选择（T-BRS）和最大-最大最佳中继选择（MM-BRS）方案。然而，当中继链路严重不平衡时，MLS方案不提供T-BRS和MM-BRS方案的分集增益;以及（ii）对于更一般的I.ni.d衰落的情况下，可以观察到MLS方案可以劣于MM-BRS方案。本文的推导具有一定的参考价值。例如，利用所获得的统计特性，可以进一步研究独立衰落信道下缓冲器辅助MLS中继系统的时延，这是缓冲器辅助中继选择系统的一个关键问题。
To obtain an insight about the effect of channel parameters on buffer-aided relay selection systems, the max-link selection (MLS) schemes are investigated over independent and non-identically distributed (i.ni.d) Rayleigh fading channels. Specially, by employing Markov chain, the authors first model the state transition matrix and outage probability. Secondly, they obtain the closed-form expressions of the corresponding statistic properties. The presented results show: (i) when the relaying channels are asymmetric (but the source–relay links are independent and identically distributed fading, so does the relay–destination links), the MLS scheme outperforms the traditional best relay selection (T-BRS) and max–max best relay selection (MM-BRS) schemes. However, when the relaying links are unbalanced severely, the MLS scheme does not provide diversity gain over the T-BRS and MM-BRS schemes; and (ii) For the more general i.ni.d fading case, it is observed that the MLS schemes can be inferior to the MM-BRS schemes. The derivations of this work have values for reference. For example, by using the achieved statistic properties they can further perform the investigation on the delay for the buffer-aided MLS relaying systems over i.ni.d fading channels, which is a critical issue of buffer-aided relay selection systems.