Transmit power minimisation for full-duplex two-way relaying systems with asymmetric packet-rates and quality-of-service requirements
Transmit power minimisation for full-duplex two-way relaying systems with asymmetric packet-rates and quality-of-service requirements
复制标题
具有不对称数据包速率和服务质量要求的全双工双向中继系统的发射功率最小化
DOI：
10.1049/iet-com.2019.0644
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发表时间：
2020-04
影响因子：
1.6
通讯作者：
Wenhua Li
中科院分区：
文献类型：
--
作者：
Chong Qian;Xiaodong Ji;Zhanghua Cao;Wenhua Li
本研究解决了具有非对称分组速率的全双工（FD）双向解码转发中继系统的目标服务质量约束下的发射功率最小化问题，其中双向中继系统可以两种不同的方式运行，即半双工源与全双工中继（HDS-FDR）和全双工源与全双工中继（FDS-FDR）方式。对于FDS-FDR方式，中继节点可以使用两种策略来处理从源接收到的信号，即物理层网络编码（PNC）和物理层叠加编码（PSC），这两种策略分别称为FDS-FDR-PNC和FDS-FDR-PSC方式。通过将发射功率最小化问题转化为两阶段问题，分别针对 HDS-FDR、FDS-FDR-PNC 和 FDS-FDR-PSC 类型开发了最佳功率控制 (OPC) 技术，为中继和源处的单独发射功率提供了封闭式解决方案。进行了计算机模拟，结果验证了所提出的 OPC 技术。结果表明，当两个源的数据包速率适度不对称或对称时，FDS-FDR-PNC 样式在节能方面表现最佳。对于数据包速率强烈不对称的情况，FDS-FDR-PSC 样式可以比其他两种样式节省更多的能量。
This study solves the transmit power minimisation problem subject to a target quality-of-service constraint of a full-duplex (FD) two-way decode-and-forward relaying system with asymmetric packet-rates, where the two-way relaying system can operate in two different styles, i.e. half-duplex sources with full-duplex relaying (HDS-FDR) and full-duplex sources with full-duplex relaying (FDS-FDR) styles. For the FDS-FDR style, the relay node can use two strategies to handle the received signals from the sources, namely, physical-layer network coding (PNC) and physical-layer superposition coding (PSC), both of which are referred to as FDS-FDR-PNC and FDS-FDR-PSC styles, respectively. By transforming the transmit power minimisation problem into a two-stage problem, optimum power control (OPC) techniques are developed for the HDS-FDR, FDS-FDR-PNC and FDS-FDR-PSC styles, respectively, giving closed-form solutions for individual transmit power at the relay and the sources. Computer simulations are conducted and the results validate the proposed OPC techniques. It is shown that the FDS-FDR-PNC style performs best in terms of energy saving when the two sources' packet-rates are moderately asymmetric or symmetric. For the case that the packet-rates are strongly asymmetric, the FDS-FDR-PSC style can save more energy than the other two styles.
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