Optimal resource allocation for energy harvesting two-way relay systems with channel uncertainty
Optimal resource allocation for energy harvesting two-way relay systems with channel uncertainty
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DOI：
10.1109/globalsip.2013.6736886
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Imtiaz Ahmed;A. Ikhlef;D. W. K. Ng;R. Schober
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文献类型：
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作者：
Imtiaz Ahmed;A. Ikhlef;D. W. K. Ng;R. Schober
在本文中，我们考虑了具有能量收集（EH）节点的双向解码和转发（DF）多址和时分广播中继协议。在考虑信道状态不确定性的情况下，对所考虑的中继协议提出了最优的离线联合能量和传输时间分配方案。提出了基于凸优化问题的能量和传输时间联合分配方案，并在有限个传输间隔内使系统总吞吐量最大化。通过仿真比较了多址协议和时分广播协议的最优吞吐量。结果表明，该方案对不完全信道状态信息具有较强的鲁棒性，并且多址广播比时分广播受中继低收获率的影响更小。
In this paper, we consider two-way decode-and-forward (DF) multiple access and time division broadcasting relaying protocols with energy harvesting (EH) nodes. We propose optimal offline joint energy and transmission time allocation schemes for the considered relaying protocols taking into account channel state uncertainty. The proposed joint energy and transmission time allocation schemes are obtained based on convex optimization problems and maximize the aggregate system throughput over a finite number of transmission intervals.We compare the optimal throughputs obtained for the multiple access and time division broadcasting protocols via simulations. Our results reveal that the proposed schemes are robust to imperfect channel state information and that multiple access broadcasting is less affected by low harvesting rate at the relay than time division broadcasting.