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arXiv 1104.0118cs.ITcs.PFmath.IT
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Nakagami-m衰落信道下译码转发中继方案的比较研究

A Comparative Study of Relaying Schemes with Decode-and-Forward over Nakagami-m Fading Channels

George C. Alexandropoulos, Agisilaos Papadogiannis, Paschalis C. Sofotasios

摘要:

利用中继技术来改善无线系统的性能是一个很有前途的途径。然而,它是至关重要的,以了解什么类型的中继方案应用于实现不同的性能目标,在现实的衰落条件下。在本文中,我们提出了一个通用的框架建模和评估的中继方案的性能的基础上解码和转发(DF)协议在独立的,不一定相同分布(INID)Nakagami-m衰落信道。特别是,我们提出了封闭形式的表达式的瞬时输出信噪比的统计数据的四个重要的中继方案DF;两个基于重复传输和其他两个基于中继选择(RS)。然后,这些表达式被用来获得封闭形式的表达式中断概率和平均符号错误概率的几个调制的所有考虑中继方案在INID Nakagami-m衰落。重要的是,它表明,当RS的信道状态信息是完美的,基于RS的传输方案总是优于重复的。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,并且在这种情况下,中继应该被关闭。

英文摘要:

Utilizing relaying techniques to improve performance of wireless systems is a promising avenue. However, it is crucial to understand what type of relaying schemes should be used for achieving different performance objectives under realistic fading conditions. In this paper, we present a general framework for modelling and evaluating the performance of relaying schemes based on the decode-and-forward (DF) protocol over independent and not necessarily identically distributed (INID) Nakagami-m fading channels. In particular, we present closed-form expressions for the statistics of the instantaneous output signal-to-noise ratio of four significant relaying schemes with DF; two based on repetitive transmission and the other two based on relay selection (RS). These expressions are then used to obtain closed-form expressions for the outage probability and the average symbol error probability for several modulations of all considered relaying schemes over INID Nakagami-m fading. Importantly, it is shown that when the channel state information for RS is perfect, RS-based transmission 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 in this case it should be switched-off.

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