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Multi-Filter Decoding in WiFi Backscatter Communication

Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
Author to whom correspondence should be addressed.
Academic Editor: Antonio Lázaro
Sensors 2021, 21(4), 1481;
Received: 8 January 2021 / Revised: 11 February 2021 / Accepted: 16 February 2021 / Published: 20 February 2021
(This article belongs to the Section Sensor Networks)
WiFi backscatter communication has emerged as a promising enabler of ultralow-power connectivity for Internet of things, wireless sensor network and smart energy. In this paper, we propose a multi-filter design for effective decoding of WiFi backscattered signals. Backscattered signals are relatively weak compared to carrier WiFi signals and therefore require algorithms that filter out original WiFi signals without affecting the backscattered signals. Two multi-filter designs for WiFi backscatter decoding are presented: the summation and delimiter approaches. Both implementations employ the use of additional filters with different window sizes to efficiently cut off undesired noise/interference, thus enhancing frame detection and decoding performance, and can be coupled with a wide range of decoding algorithms. The designs are particularly productive in the frequency-shift WiFi backscatter communication. We demonstrate via prototyping and testbed experiments that the proposed design enhances the performance of various decoding algorithms in real environments. View Full-Text
Keywords: WiFi backscatter communication; multi-filter design; frequency-shift; IoT WiFi backscatter communication; multi-filter design; frequency-shift; IoT
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MDPI and ACS Style

Boateng Nti, R.; Yun, J.-H. Multi-Filter Decoding in WiFi Backscatter Communication. Sensors 2021, 21, 1481.

AMA Style

Boateng Nti R, Yun J-H. Multi-Filter Decoding in WiFi Backscatter Communication. Sensors. 2021; 21(4):1481.

Chicago/Turabian Style

Boateng Nti, Richard, and Ji-Hoon Yun. 2021. "Multi-Filter Decoding in WiFi Backscatter Communication" Sensors 21, no. 4: 1481.

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