A Low-Power Backscatter Modulation System Communicating Across Tens of Meters With Standards-Compliant Wi-Fi Transceivers

Po-Han Peter Wang; Chi Zhang; Hongsen YangManideep DunnaDinesh BharadiaPatrick P. Mercier

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A Low-Power Backscatter Modulation System Communicating Across Tens of Meters With Standards-Compliant Wi-Fi Transceivers

机译：A Low-Power Backscatter Modulation System Communicating Across Tens of Meters With Standards-Compliant Wi-Fi Transceivers

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This article presents the first integrated circuit designed to enable low-power backscatter communication with commodity Wi-Fi transceivers. The developed chip operates by receiving a series of packets generated from a Wi-Fi access point (AP), which feeds into a low-power energy-detecting wake-up receiver that determines when backscatter communication should commence. Then, the Wi-Fi AP sends an additional packet that is intended to be backscatter modulated. To accomplish this, the antenna receiving the incident Wi-Fi packet is terminated by a dynamically varying collection of complex impedances via a crystal-stabilized multi-phase local oscillator driven by a single-sideband (SSB) mixer, which ultimately performs SSB quadrature phase shift-keying (QPSK) modulation with frequency-translation to a separate Wi-Fi channel for reception by a second Wi-Fi AP. Implemented in 65-nm CMOS, the downlink wake-up receiver consumes 2.8 inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"$mu text{W}$ /tex-math/inline-formula and achieves a sensitivity of ?42.5 dBm, which is good enough for 30 m wake-up range, while the backscattering uplink consumes 28 inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" tex-math notation="LaTeX"$mu text{W}$ /tex-math/inline-formula and achieves 17 dB of image rejection. Wireless tests reveal a range of 21 m when the developed IC is placed symmetrically between Wi-Fi access points (APs), and a range of 90 m when the developed IC is placed within 1 m of the transmitting Wi-Fi AP.

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来源
《IEEE Journal of Solid-State Circuits》 |2020年第11期|2959-2969|共11页
作者
Po-Han Peter Wang; Chi Zhang; Hongsen YangManideep DunnaDinesh BharadiaPatrick P. Mercier;
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作者单位

University of California at San Diego, La Jolla, CA, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类基本电子电路;
关键词
Backscatter; Wireless fidelity; Amplitude modulation; Frequency modulation; Phase shift keying;

A Low-Power Backscatter Modulation System Communicating Across Tens of Meters With Standards-Compliant Wi-Fi Transceivers

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