Abstract

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.

Highlights

  • The fifth-generation-enabled Internet of Things (5G-enabled IoT) is considered to be a key enabler for automation of almost all industries [1,2,3,4,5]

  • WiFiBSC opens up a promising opportunity for tags to join WiFi-based IoT networks, but WiFi readers are expensive because they are required to support costly full-duplex techniques or collaborate with other WiFi nodes to implement the self-interference cancellation

  • Different from the above approaches, without deploying a full-duplex transceiver and assigning a dedicated band for backscatter communication (BSC) in our design, we enable a half-duplex WiFi node to receive and decode the backscatter signals using only two regular antennas

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Summary

Introduction

The fifth-generation-enabled Internet of Things (5G-enabled IoT) is considered to be a key enabler for automation of almost all industries [1,2,3,4,5]. Our design only requires a conventional WiFi node to be equipped with two regular half-duplex antennas, so as to adopt MU-MIMO to decode the reflected signals from tags This avoids adopting costly fullduplex technique and collaborating with other nodes for extracting reflected signals of tags, thereby saving equipment cost greatly (2) Propose a long-range node-assisted WiFi-BSC design. To improve the decoding accuracy, BackFi [8] is proposed to enable the reader to have prior knowledge of the ambient signal In this approach, a WiFi node equipped with a fullduplex transceiver is introduced to perform regular WiFi transmission and backscatter reception simultaneously. Different from the above approaches, without deploying a full-duplex transceiver and assigning a dedicated band for BSC in our design, we enable a half-duplex WiFi node to receive and decode the backscatter signals using only two regular antennas.

Our Design
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