The fifth-generation-enabled Internet of Things (5G-enabled IoT) has been considered as a key enabler for the automation of almost all industries. In 5G-enabled IoT, resource-limited passive devices are expected to join the IoT using the WiFi backscatter communication (WiFi-BSC) technology. However, WiFi-BSC deployment is currently limited due to high equipment cost and short transmission range. To address these two drawbacks, in this paper, we propose a low-cost and long-range node-assisted WiFi backscatter communication scheme. In our scheme, a WiFi node can receive backscatter signals using two cheap regular half-duplex antennas (instead of using expensive full-duplex technique or collaborating with multiple other nodes), thereby reducing the equipment cost. Besides, WiFi nodes can help relay backscatter signals to remote 5G infrastructure, greatly extending the backscatter’s transmission range. We then develop a theoretical model to analyze the throughput of WiFi-BSC. Extensive simulations verify the effectiveness of our scheme and the accuracy of our model.

中文翻译：

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用于支持 5G 的物联网网络的低成本和远程节点辅助 WiFi 反向散射通信

支持第五代的物联网（5G-enabled IoT）被认为是几乎所有行业自动化的关键推动因素。在支持 5G 的物联网中，资源有限的无源设备有望使用 WiFi 反向散射通信 (WiFi-BSC) 技术加入物联网。然而，由于设备成本高、传输距离短，目前WiFi-BSC的部署受到限制。为了解决这两个缺点，在本文中，我们提出了一种低成本、远程节点辅助的 WiFi 反向散射通信方案。在我们的方案中，一个 WiFi 节点可以使用两个便宜的常规半双工天线接收反向散射信号（而不是使用昂贵的全双工技术或与多个其他节点协作），从而降低设备成本。此外，WiFi 节点可以帮助将反向散射信号中继到远程 5G 基础设施，大大扩展了反向散射的传输范围。然后我们开发了一个理论模型来分析 WiFi-BSC 的吞吐量。大量的模拟验证了我们方案的有效性和我们模型的准确性。