A Comparative Study of Relaying Schemes with Decode and Forward over Nakagami-m Fading Channels
A Comparative Study of Relaying Schemes with Decode and Forward over Nakagami-m Fading Channels
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DOI：
10.1155/2011/560528
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发表时间：
2011-04
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影响因子：
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通讯作者：
G. C. Alexandropoulos;Agisilaos Papadogiannis;P. C. Sofotasios
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作者：
G. C. Alexandropoulos;Agisilaos Papadogiannis;P. C. Sofotasios
虽然中继可以是非常有益的无线系统，了解中继方案可以实现特定的性能目标下的现实衰落是至关重要的。在本文中，我们提出了一个通用的框架建模和评估性能的双跳解码和转发（DF）中继方案在独立的，不一定同分布（INID）Nakagami-m衰落信道。我们获得了封闭形式的表达式的瞬时输出信号的统计重复传输选择多样性的信噪比。此外，我们提出了一个统一的统计概述其他三个重要的中继方案DF，一个基于重复传输与最大比分集和其他两个基于中继选择（RS）。为了比较所考虑的方案，我们提出了封闭形式和解析表达式的中断概率和平均符号错误概率下的各种调制方法，分别。重要的是，它表明，当RS的信道状态信息是完美的，RS为基础的计划总是优于重复的。此外，当源节点和目的地节点之间的直接链路足够强时，中继可能不会导致任何增益，并且应该将其关闭。
Although relaying can be very beneficial for wireless systems, understanding which relaying schemes can achieve specific performance objectives under realistic fading is crucial. In this paper we present a general framework for modeling and evaluating the performance of dual-hop decode-and-forward (DF) relaying schemes over independent and not necessarily identically distributed (INID) Nakagami-m fading channels. We obtain closed-form expressions for the statistics of the instantaneous output signal-to-noise ratio of repetitive transmission with selection diversity. Furthermore, we present a unified statistical overview of other three significant relaying schemes with DF, one based on repetitive transmission with maximal-ratio diversity and the other two based on relay selection (RS). To compare the considered schemes, we present closed-form and analytical expressions for the outage probability and the average symbol error probability under various modulation methods, respectively. Importantly, it is shown that when the channel state information for RS is perfect, RS-based schemes always outperform repetitive ones. Furthermore, when the direct link between the source and the destination nodes is sufficiently strong, relaying may not result in any gains, and it should be switched off.