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arXiv 1104.0735cs.ITmath.IT
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单中继信道非正交DF方案及标记效应

A Non-Orthogonal DF Scheme for the Single Relay Channel and the Effect of Labelling

Vijayvaradharaj T Muralidharan, B. Sundar Rajan

摘要:

我们考虑在瑞利衰落环境中,在源节点、中继节点和目的节点处具有单个天线的半双工单中继信道上的未编码传输。中继器处于接收模式的阶段被称为阶段1,中继器处于发送模式的阶段被称为阶段2。考虑以下两种情况:非正交解码和转发(NODF)方案,其中源和中继都在阶段2期间发送;以及正交解码和转发(ODF)方案,其中中继在阶段2期间单独发送。提出了一种近ML解码器,它给出了全分集(分集阶数2)的NODF方案。由于中继站与目的地的接近性,源-目的地链路通常预期比中继站-目的地链路弱得多。因此,不清楚在NODF方案中的阶段2期间由源进行的传输是否提供优于ODF方案的任何性能改进。在这方面,它示出的NODF方案提供了显着的性能改进的ODF方案。事实上,在高信噪比下,非理想源-中继链路的NODF方案的性能与理想源-中继链路的NODF方案的性能相同。换句话说,为了研究NODF方案的高SNR性能,可以假设源-中继链路是理想的,而ODF方案并非如此。此外,它示出,适当的选择的映射的位上的信号点在源和中继,提供了一个显着的改善性能,为NODF和ODF计划。

英文摘要:

We consider the uncoded transmission over the half-duplex single relay channel, with a single antenna at the source, relay and destination nodes, in a Rayleigh fading environment. The phase during which the relay is in reception mode is referred to as Phase 1 and the phase during which the relay is in transmission mode is referred to as Phase 2. The following two cases are considered: the Non-Orthogonal Decode and Forward (NODF) scheme, in which both the source and the relay transmit during Phase 2 and the Orthogonal Decode and Forward (ODF) scheme, in which the relay alone transmits during Phase 2. A near ML decoder which gives full diversity (diversity order 2) for the NODF scheme is proposed. Due to the proximity of the relay to the destination, the Source-Destination link, in general, is expected to be much weaker than the Relay-Destination link. Hence it is not clear whether the transmission made by the source during Phase 2 in the NODF scheme, provides any performance improvement over the ODF scheme or not. In this regard, it is shown that the NODF scheme provides significant performance improvement over the ODF scheme. In fact, at high SNR, the performance of the NODF scheme with the non-ideal Source-Relay link, is same as that of the NODF scheme with an ideal Source-Relay link. In other words, to study the high SNR performance of the NODF scheme, one can assume that the Source-Relay link is ideal, whereas the same is not true for the ODF scheme. Further, it is shown that proper choice of the mapping of the bits on to the signal points at the source and the relay, provides a significant improvement in performance, for both the NODF and the ODF schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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