论文标题
无CSI与CSI基于CSI的多端纳湿，用于大规模的低功率互联网
CSI-free vs CSI-based multi-antenna WET for massive low-power Internet of Things
论文作者
论文摘要
无线能源转移（湿）是为大规模部署互联网供电的有前途的解决方案。一个重要的问题是，对于最佳性能，是否需要昂贵的渠道状态信息（CSI）采集程序。在本文中，我们通过在下行链路中的湿式设置中评估了基于CSI的和无CSI的多Antenna湿方案，并在下行链路中评估了基于CSI的和无CSI的多Antenna湿方案，并在上行链路上进行了定期或泊松交通无线信息传递（WIT），从而对此进行了一些启示。当有CSI可用时，我们表明，每当最远的节点经历至少3 dB的功率衰减比其余设备时，最大比率传输光束器接近最佳。另一方面，尽管采用的无CSI机制无法提供平均收获收益，但与基于CSI的方案相比，它确实提供了更大的湿/机智多样性，具有较低的能量需求。我们的数值结果证据表明，无CSI的方案在周期性的交通条件下表现出色，但是如果没有最佳配置，则可能会在泊松流量中不足。最后，当上行链路传输是周期性的，同时强调了最小平方误差均衡器的需求，而不是零对信息解码的零，我们表明了显着的性能结果。
Wireless Energy Transfer (WET) is a promising solution for powering massive Internet of Things deployments. An important question is whether the costly Channel State Information (CSI) acquisition procedure is necessary for optimum performance. In this paper, we shed some light into this matter by evaluating CSI-based and CSI-free multi-antenna WET schemes in a setup with WET in the downlink, and periodic or Poisson-traffic Wireless Information Transfer (WIT) in the uplink. When CSI is available, we show that a maximum ratio transmission beamformer is close to optimum whenever the farthest node experiences at least 3 dB of power attenuation more than the remaining devices. On the other hand, although the adopted CSI-free mechanism is not capable of providing average harvesting gains, it does provide greater WET/WIT diversity with lower energy requirements when compared with the CSI-based scheme. Our numerical results evidence that the CSI-free scheme performs favorably under periodic traffic conditions, but it may be deficient in case of Poisson traffic, specially if the setup is not optimally configured. Finally, we show the prominent performance results when the uplink transmissions are periodic, while highlighting the need of a minimum mean square error equalizer rather than zero-forcing for information decoding.
