In this letter, we consider wireless powered communication networks (WPCNs) that consist of a hybrid access-point (H-AP) with a single antenna, an intelligent reflecting surface (IRS), and multiple users, each with a single antenna. In the downlink, users harvest energy from both an energy signal transmitted from the H-AP, and the reflected signal at the IRS. In the uplink, users transmit information using harvested energy, following non-orthogonal multiple access (NOMA). In particular, the signals from users and the reflected signals at the IRS are superposed and received at the H-AP. The sum-throughput for the considered network is maximized by jointly optimizing the transmit time, power, and phase shifts induced by the IRS. Numerical results show the sum-throughput enhancement by the IRS, and the impact of the IRS on the user fairness of the system.

中文翻译：

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具有IRS-NOMA的无线供电通信网络的最大吞吐量设计

在这封信中，我们考虑了无线通信网络（WPCN），该网络由具有单个天线的混合接入点（H-AP），智能反射面（IRS）和多个用户（每个具有单个天线）组成。在下行链路中，用户既可以从H-AP发送的能量信号中获得能量，也可以从IRS的反射信号中获得能量。在上行链路中，用户在非正交多址访问（NOMA）之后使用收获的能量传输信息。特别地，来自用户的信号和在IRS处的反射信号在H-AP处叠加和接收。通过共同优化IRS引起的传输时间，功率和相移，可以最大化所考虑网络的总吞吐​​量。数值结果表明，IRS可以提高总吞吐量，