论文标题
无线功率无电单元的物联网：分析和优化
Wirelessly Powered Cell-free IoT: Analysis and Optimization
论文作者
论文摘要
在本文中，我们提出了一种基于无细胞大规模MIMO技术的无线功率互联网（IoT）系统。在这样的系统中，在下行链路阶段，传感器收获分布式接入点（AP）发出的射频（RF）能量。在上行链路阶段，传感器使用收获的能量将数据传输到AP。可以将巨大的MIMO和小型物联网视为无细胞IoT的特殊情况。我们在收获能量的量上得出了紧密的闭合形式下限，并分别将SINR作为电力传输和数据传输的指标。为了提高能源效率，我们共同优化上行链路和下行链路控制系数，以最大程度地减少达到目标SINR的总发射能量消耗。扩展的仿真结果表明，无细胞的物联网优于大规模的MIMO和小型物联网，这两者都在上行链路的每个用户吞吐量方面以及用于下行链路收获的能量量。此外，根据每个用户吞吐量和能源消耗，拟议的联合功率控制可以实现巨大的收益。
In this paper, we propose a wirelessly powered Internet of Things (IoT) system based on the cell-free massive MIMO technology. In such a system, during the downlink phase, the sensors harvest radio-frequency (RF) energy emitted by the distributed access points (APs). During the uplink phase, sensors transmit data to the APs using the harvested energy. Collocated massive MIMO and small-cell IoT can be treated as special cases of cell-free IoT. We derive the tight closed-form lower bound on the amount of harvested energy, and the closed-form expression of SINR as the metrics of power transfer and data transmission, respectively. To improve the energy efficiency, we jointly optimize the uplink and downlink power control coefficients to minimize the total transmit energy consumption while meeting the target SINRs. Extended simulation results show that cell-free IoT outperforms collocated massive MIMO and small-cell IoT both in terms of the per user throughput for uplink, and the amount of energy harvested for downlink. Moreover, significant gains can be achieved by the proposed joint power control in terms of both per user throughput and energy consumption.
