Implementation of Bistatic Backscatter Wireless Communication System Using Ambient Wi-Fi Signals

• Young-Han Kim,
• Hyun-Seok Ahn,
• Changseok Yoon,
• Yongseok Lim,
• Seung-ok Lim,
• Myung-Hyun Yoon,

Vol. 11, No. 2, February 27, 2017
10.3837/tiis.2017.02.036, Download Paper (Free):

• Backscatter communication
• Wi-Fi
• sensor tag
• ambient RF
• Channel State Information (CSI)

Abstract

This paper presents the architecture design, implement, experimental validation of a bistatic backscatter wireless communication system in Wi-Fi network. The operating principle is to communicate a tag’s data by detecting the power level of the power modulated Wi-Fi packets to be reflected or absorbed by backscatter tag, in interconnecting with Wi-Fi device and Wi-Fi AP. This system is able to provide the identification and sensor data of tag on the internet connectivity without requiring extra device for reading data, because this uses an existing Wi-Fi AP infrastructure. The backscatter tag consists of Wi-Fi energy harvesting part and a backscatter transmitter/a power-detecting receiver part. This tag can operate by harvesting and generating energy from Wi-Fi signal power. Wi-Fi device decodes information of the tag data by recognizing the power level of the backscattered Wi-Fi packets. Wi-Fi device receives the backscattered Wi-Fi packets and generates the tag’s data pattern in the time-series of channel state information (CSI) values. We believe that this system can be achieved wireless connectivity for ultra- low-power IoT and wearable device.

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