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首页> 外文期刊>Communications, IET >Finite-signal-to-noise ratio diversity-multiplexing-delay tradeoff in half-duplex hybrid automatic repeat request relay channels
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Finite-signal-to-noise ratio diversity-multiplexing-delay tradeoff in half-duplex hybrid automatic repeat request relay channels

机译：半双工混合自动重复请求中继信道中的有限信噪比分集复用延迟权衡

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摘要

In this study, the authors consider a delay-limited hybrid automatic repeat request (HARQ) protocol that makes use of incremental redundancy over the three-node decode-and-forward relay fading channel where one source cooperates with a relay to transmit information to the destination. They provide an estimate of the diversity-multiplexing tradeoff (DMT) at finite signal-to-noise ratio (SNR) based on tight bounds on outage probabilities for two channel models. The results for the long-term quasi-static channel highlight the distributed diversity, that is, the cooperative space diversity, and the HARQ coding gain, achieved by soft combining the successive transmitted punctured codewords via incremental redundancy. On the other hand, the results for the short-term quasi-static channel illustrate the diversity gains obtained, thanks to cooperative space diversity and time diversity, along with the HARQ coding gain. Using the DMT formulation, they show that equal power partitioning between the source and the relay nodes provides close to optimal performance. Furthermore, thanks to the extension of the finite-SNR DMT to the finite-SNR diversity-multiplexing-delay tradeoff, they show that, unlike the asymptotic SNR analysis, the ARQ delay, defined as the maximum number of retransmissions rounds, impacts the performance of the HARQ relay protocol for high effective multiplexing gain.
机译：在这项研究中，作者考虑了一种延迟受限的混合自动重传请求（HARQ）协议，该协议利用三节点解码转发中继衰落信道上的增量冗余，其中一个源与中继协作以将信息传输到中继。目的地。他们基于两个通道模型的中断概率的严格界限，以有限信噪比（SNR）估算分集复用权衡（DMT）。长期准静态信道的结果突出显示了分布的分集，即协作空间分集和HARQ编码增益，这是通过增量冗余对连续发送的穿孔码字进行软组合而实现的。另一方面，短期准静态信道的结果说明了由于协作空间分集和时间分集以及HARQ编码增益而获得的分集增益。使用DMT公式，他们表明源和中继节点之间的相等功率分配提供了接近最佳的性能。此外，由于将有限信噪比DMT扩展为有限信噪比分集复用延迟折衷方案，因此他们表明，与渐近SNR分析不同，ARQ延迟（定义为最大重传次数）会影响性能用于高有效复用增益的HARQ中继协议。

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