Cooperative Hybrid ARQ in Wireless Decode-and-Forward Relay Networks
Cooperative Hybrid ARQ in Wireless Decode-and-Forward Relay Networks
复制标题
无线解码转发中继网络中的协作混合ARQ
DOI：
10.1109/vetecs.2010.5493996
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
I. Collings
中科院分区：
文献类型：
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作者：
Wei Ni;Zhuo Chen;I. Collings
无线解码转发（DF）中继网络遭受严重的延迟，由于多跳传播。当采用混合ARQ（HARQ）时，由于在给定时间内不成功分组的重传次数减少，延迟导致各个HARQ过程的吞吐量降级。我们提出了两个新的分布式合作HARQ协议，不仅减少延迟，但也优化吞吐量在前向和反向DF链路。利用来自多个分组的附加选择分集来补偿反向DF链路中的功率较小的源引起的吞吐量损失。基于第一跳接收质量，每个中继站（RS）独立地转发分组，使得从目的地的角度来看，有效地形成具有最高瞬时吞吐量的三种协作中继模式之一：空间复用（SM）、空时发射分集（STTD）和单播（UC）。可以以最小的延迟实现最大的吞吐量。所提出的方法的优越性已被证明在最佳的频谱效率和显着减少延迟。与集中式方法相比，在高信噪比（SNR）下减少高达40%，并且单个HARQ进程的吞吐量因此增加。
Wireless decode-and-forward (DF) relay networks suffer from severe latency due to multi-hop propagation. When hybrid ARQ (HARQ) is employed, the latency leads to the throughout degradation of individual HARQ processes because of the decreased number of retransmissions of unsuccessful packets in a given time. We propose two new distributed cooperative HARQ protocols to not only reduce latency but also optimize throughput in both forward and reverse DF links. Additional selection diversity from multiple packets is exploited to compensate for the throughput loss stemming from the less powerful source in the reverse DF link. Based on the 1st hop reception quality, each relay station (RS) independently forwards the packet in such a manner that, from the perspective of the destination, one of the three cooperative relaying modes is effectively formed with the highest instantaneous throughput: spatial multiplexing (SM), space-time transmit diversity (STTD) and unicast (UC). The maximal throughput can be achieved with minimal latency. The superiority of the proposed approaches has been demonstrated in terms of the optimal spectral efficiency and significant reduction in latency. Compared to the centralized approaches, the reduction is up to 40% at high signal-to-noise ratio (SNR) and the throughput of individual HARQ processes increases as a result.
移动宽带无线接入：LTE 和 LTE-Advanced
DOI：
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发表时间：
2009
期刊：
影响因子：
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作者：
M.Sawahashi;Y.Kishiyama;H.Taoka;M.Tanno;T.Nakamura
通讯作者：
T.Nakamura