Wireless Powered Opportunistic Cooperative Backscatter Communications: To Relay or Not?
Wireless Powered Opportunistic Cooperative Backscatter Communications: To Relay or Not?
复制标题
DOI：
10.1109/vtc2022-spring54318.2022.9860432
复制
发表时间：
2022-06
期刊：
影响因子：
--
通讯作者：
Rui Xu;Yinghui Ye;Haijian Sun;G. Lu
中科院分区：
文献类型：
--
作者：
Rui Xu;Yinghui Ye;Haijian Sun;G. Lu
在本文中，我们提出了一种无线供电的机会协作反向散射通信网络，其中物联网（IoT）节点在每个传输块中借助混合接入点（HAP）通过反向散射通信将信息传送给其相关联的接收器。HAP在传输块的前半段为物联网节点提供能量信号，并在传输块的后半段继续这样做，或者通过解码转发协议将物联网节点的信号中继到接收器。我们从可实现的吞吐量方面研究在何种条件下HAP在传输块的后半段充当中继节点。为此，我们制定了一个混合整数非凸优化问题，通过优化物联网节点的功率反射系数（PRC）以及HAP在传输块后半段的操作模式来最大化物联网节点的吞吐量，同时满足物联网节点的能量因果约束。我们推导出了最优PRC和操作模式的闭式表达式，并在此基础上提出了一种确定HAP最优操作模式的方案。仿真验证了所推导的结果，并研究了各种参数对最优操作模式和吞吐量的影响。
In this article, we propose a wireless powered opportunistic cooperative backscatter communication network, where an Internet of Things (IoT) node conveys information to its associated receiver via backscatter communications with the help of a hybrid access point (HAP) in each transmission block. The HAP provides energy signals for the IoT node in the first half transmission block, and continues to do or relays the IoT node’s signal to the receiver via decode-and-forward protocol in the second half transmission block. We investigate under which condition the HAP serves as the relay node in the second half transmission block in terms of the achievable throughput. To this end, a mixed integer non-convex optimization is formulated to maximize the throughput of the IoT node by optimizing the power reflection coefficient (PRC) of the IoT node and the operation mode of the HAP during the second half transmission block, while meeting the energy-causality constraint of the IoT node. We derive the closed-form expressions for the optimal PRC and operation mode, based on which a scheme is proposed to determine the optimal operation mode of the HAP. Simulations validate the derived results and study the impacts of various parameters on the optimal operation mode and throughput.