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

• Published in: KSII transactions on Internet and information systems 2017, 11(2), , pp.1250-1264
• Main Authors: Kim, Young-Han, Ahn, Hyun-Seok, Yoon, Changseok, Lim, Yongseok, Lim, Seung-ok, Yoon, Myung-Hyun
• Format: Article
• Language: English
• Subjects: Backscattering; Engineering research; Methods; Mobile communication systems; Wi-Fi; Wireless communication systems; 컴퓨터학
• ISSN: 1976-7277; 1976-7277
• DOI: 10.3837/tiis.2017.02.036

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. KCI Citation Count: 1