Wireless Powered Communication (WPC) provides an effective solution to the contradiction between information transmission and energy consumption for Internet of Things (IoT) terminals. In this paper, a clustered-Non-Orthogonal Multiple Access (C-NOMA) based WPC model is proposed. Base Station (BS) transfers Radio Frequency (RF) energy to all terminals in the downlink, while terminals transmit information to BS in the uplink by utilizing the harvested energy. A terminal clustering scheme based on maximizing the sum of channel condition difference between terminals is adopted. Specifically, Orthogonal Frequency Division Multiple Access (OFDMA) is used for inter-cluster terminals, while NOMA is used for intra-cluster terminals. In addition, a time-sharing mechanism is adopted to decode information. The sum rate in the uplink is maximized by jointly optimizing transmit power of BS, uplink and downlink subslot. Simulation results demonstrate that, the proposed C-NOMA based WPC model can not only maximize the sum rate in the uplink, but also enhance the fairness between terminals.

无线通信（WPC）为物联网（IoT）终端的信息传输与能耗之间的矛盾提供了有效的解决方案。本文提出了一种基于聚类的非正交多址访问（C-NOMA）的WPC模型。基站（BS）将射频（RF）能量传输到下行链路中的所有终端，而终端则利用所收集的能量将信息发送到上行链路中的BS。采用基于最大化终端之间的信道条件差之和的终端聚类方案。具体地说，正交频分多址（OFDMA）用于集群间终端，而NOMA用于集群内终端。另外，采用分时机制对信息进行解码。通过共同优化BS，上行链路和下行链路子时隙的发射功率，可以最大化上行链路中的总速率。仿真结果表明，所提出的基于C-NOMA的WPC模型不仅可以最大化上行链路的求和率，而且可以提高终端之间的公平性。