论文标题
可重新配置的智能表面辅助恒定无线电源传递
Reconfigurable Intelligent Surface Aided Constant-Envelope Wireless Power Transfer
论文作者
论文摘要
通过人工重新配置电磁波的传播环境，可重新配置的智能表面（RISS）被视为一种有希望的革命性硬件技术，可提高无线网络的能量和光谱效率。在本文中，我们研究了RIS辅助多源多输入单输出（MISO）无线功率传输（WPT）系统，其中发射器配备了恒定的Envelope模拟光束器。我们制定了一个新颖的问题，可以通过在RISS处共同优化发射器和相移，从而最大化所有用户的总收到的功率，但要遵守用户的最小收到的功率约束。我们在每个步骤中都以封闭形式的表达方式迭代地解决了问题。数值结果表明，部署RI的性能增长和提出的算法的有效性。
By reconfiguring the propagation environment of electromagnetic waves artificially, reconfigurable intelligent surfaces (RISs) have been regarded as a promising and revolutionary hardware technology to improve the energy and spectrum efficiency of wireless networks. In this paper, we study a RIS aided multiuser multiple-input single-output (MISO) wireless power transfer (WPT) system, where the transmitter is equipped with a constant-envelope analog beamformer. We formulate a novel problem to maximize the total received power of all the users by jointly optimizing the beamformer at transmitter and the phase shifts at the RISs, subject to the individual minimum received power constraints of users. We further solve the problem iteratively with a closed-form expression for each step. Numerical results show the performance gain of deploying RIS and the effectiveness of the proposed algorithm.
