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A novel cooperative transmission scheme based on superposition coding and partial relaying

机译：基于叠加编码和部分中继的新型协作传输方案

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This paper considered the single relay system and proposed a novel repetition coding decode-and-forward (DF) cooperative transmission scheme on the basis of superposition coding and partial relaying. In the proposed scheme, the link disparity due to the geometry of the relay network is emphasized, and only a fraction of the information is transmitted in relay mode with the rest being transmitted directly, which benefits from the utility of superposition coding (SC) in broadcast situation. The proposed scheme is analyzed in two cases, one assumes full channel state information at the source (full CSIS), the other with only mean gain of each link known by the source (partial CSIS). For both cases, the optimal design of system parameters is considered. We investigate the achievable rate and expected rate performance for these two cases, respectively. The proposed schemed is well compared with conventional repetition coding DF, parallel coding DF, as well as another promising superposition coding relaying. It is concluded that, by designing protocols that orients to certain network geometry, better trade-off between performance and complexity can be obtained. The analysis reveals that the gap between conventional repetition and parallel coding is largely mitigated by the proposed scheme, quite for the scenario that the relay locates relatively but not extremely closer to the source, at moderate SNR regime for both partial and full CSIS cases. The proposed scheme becomes more beneficial in severe path loss attenuation scenario. Copyright (c) 2013 John Wiley & Sons, Ltd.
机译：本文考虑了单中继系统，并在叠加编码和部分中继的基础上提出了一种新颖的重复编码解码转发协作传输方案。在所提出的方案中，由于中继网络的几何形状而引起的链路差异被强调，并且仅一部分信息以中继模式被传输，其余的信息被直接传输，这得益于重叠编码（SC）的实用性。广播情况。在两种情况下对提出的方案进行了分析，一种情况假设源处有完整的信道状态信息（完整的CSIS），另一种情况是源知道每个链路的平均增益（部分CSIS）。对于这两种情况，都考虑了系统参数的最佳设计。我们分别研究了这两种情况的可实现率和预期率性能。所提出的方案与常规重复编码DF，并行编码DF以及另一种有希望的叠加编码中继相比较。结论是，通过设计针对某些网络几何结构的协议，可以在性能和复杂性之间取得更好的折衷。分析表明，所提出的方案极大地缓解了常规重复和并行编码之间的差距，对于中继定位相对但并非非常接近信源的情况，无论是部分信噪比还是全部CSIS情况，信噪比均处于中等水平。所提出的方案在严重的路径损耗衰减情况下变得更加有益。版权所有（c）2013 John Wiley＆Sons，Ltd.

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