Two-way relay networks with wireless power transfer: design and performance analysis
Two-way relay networks with wireless power transfer: design and performance analysis
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DOI：
10.1049/iet-com.2015.0728
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
Yuanwei Liu;Lifeng Wang;M. Elkashlan;T. Duong;A. Nallanathan
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文献类型：
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作者：
Yuanwei Liu;Lifeng Wang;M. Elkashlan;T. Duong;A. Nallanathan
本研究考虑放大转发双向中继网络，其中能量受限的中继节点从接收到的射频信号中收获能量。它们基于时间交换接收机，在时间上分离能量收集（EH）阶段和信息处理（IP）阶段。在EH阶段，提出了三种实用的无线功率传输策略：（i）双源（DS）功率传输，其中两个源都向中继器传输功率;（ii）单固定源功率传输，其中固定源向中继器传输功率;以及（iii）单最佳源（SBS）功率传输，其中具有最强信道的源向中继器传输功率。在IP阶段，提出了一个新的比较框架的无线电力传输政策的两个双向中继协议，称为多址广播（MABC）和时分广播（TDBC）。为了验证所提出的策略的性能，新的解析表达式推导出中断概率，吞吐量和系统的能量效率。数值结果证实了作者的分析，并显示：（i）DS策略执行最好的中断概率和吞吐量的建议的政策，（ii）TDBC协议实现较低的中断概率比MABC协议，（iii）存在一个最佳值的EH时间分数，以最大限度地提高吞吐量。
This study considers amplify-and-forward two-way relay networks, where an energy constrained relay node harvests energy from the received radio-frequency signal. Based on time switching receiver, they separate the energy harvesting (EH) phase and the information processing (IP) phase in time. In the EH phase, three practical wireless power transfer policies are proposed: (i) dual-source (DS) power transfer, where both sources transfer power to the relay; (ii) single-fixed-source power transfer, where a fixed source transfers power to the relay; and (iii) single-best-source (SBS) power transfer, where a source with the strongest channel transfers power to the relay. In the IP phase, a new comparative framework of the proposed wireless power transfer policies is presented in two bi-directional relaying protocols, known as multiple access broadcast (MABC) and time division broadcast (TDBC). To characterise the performance of the proposed policies, new analytical expressions are derived for the outage probability, the throughput, and the system energy efficiency. Numerical results corroborate the authors’ analysis and show: (i) the DS policy performs the best in terms of both outage probability and throughput among the proposed policies, (ii) the TDBC protocol achieves lower outage probability than the MABC protocol, and (iii) there exits an optimal value of EH time fraction to maximise the throughput.