Outage analysis of opportunistic cooperation over rayleigh fading channels
Outage analysis of opportunistic cooperation over rayleigh fading channels
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DOI：
10.1109/twc.2009.080653
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发表时间：
2009-06
影响因子：
10.4
通讯作者：
Yulong Zou;B. Zheng;Jia Zhu
中科院分区：
文献类型：
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作者：
Yulong Zou;B. Zheng;Jia Zhu
协作技术是对抗无线衰落、提高信道容量的一种很有前途的技术。然而，合作传输不能保证总是比直接传输更好地执行，因为直接和中继信道的统计是变化的，由于大尺度衰落。因此，我们设计了一个机会主义的标准，自动确定传输模式应采用的信道质量从源到合作中继，而不是确定性的合作，无论中继信道条件。根据所提出的准则，进一步提出了两种机会协作方案，即基于选择分集合并和基于最大比合并的机会协作方案，并给出了瑞利衰落信道下这两种方案的中断概率的闭式表达式.为了比较，我们还分析了已知的确定性合作和编码合作的中断概率。数值结果表明，我们的计划优于传统的计划中断概率，特别是当中继信道条件恶化。此外，我们比较了基于MRC的机会合作和基于SDC的机会合作，显示了前者的优越性。
Cooperation is emerging as a promising technology to combat the wireless fading and enhance the channel capacity. However,cooperative transmission can not be guaranteed to perform better always than direct transmission, since the statistics of both direct and relay channels are varied due to large scale fading. Therefore, we design an opportunistic criterion to automatically determine which transmission mode should be adopted depending on the channel quality from the source to the cooperative relay, as opposed to the deterministic cooperation regardless of relay channel conditions. According to the proposed criterion, we further present two opportunistic cooperation schemes, namely, the SDC (selection diversity combining) -based and the MRC (maximum ratio combining) -based opportunistic cooperation, and develop the closed-form expressions of outage probability for the proposed schemes over Rayleigh fading channels. For the purpose of comparison, we also analyze the outage probability for the known deterministic cooperation and coded cooperation. Numerical results show that our schemes outperform the traditional schemes in terms of outage probability, especially when the relay channel conditions worsen. In addition, we compare the MRC-based opportunistic cooperation with the SDC-based opportunistic cooperation, showing the superiority of the former scheme.