Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff

Bruno Clerckx; Zati Bayani Zawawi; Kaibin Huang

doi:10.1109/LCOMM.2017.2716341

Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff

Bruno Clerckx, Zati Bayani Zawawi, Kaibin Huang

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

This letter shows that wirelessly powered backscatter communications is subject to a fundamental tradeoff between the harvested energy at the tag and the reliability of the backscatter communication, measured in terms of SNR at the reader. Assuming the RF transmit signal is a multisine waveform adaptive to the channel state information, we derive a systematic approach to optimize the transmit waveform weights (amplitudes and phases) in order to enlarge as much as possible the SNR-energy region. Performance evaluations confirm the significant benefits of using multiple frequency components in the adaptive transmit multisine waveform to exploit the nonlinearity of the rectifier and a frequency diversity gain.

Original language	English
Article number	7950915
Pages (from-to)	2234-2237
Number of pages	4
Journal	IEEE Communications Letters
Volume	21
Issue number	10
DOIs	https://doi.org/10.1109/LCOMM.2017.2716341
Publication status	Published - 2017 Oct

Keywords

Backscatter communications
SNR-energy tradeoff
waveform design
wireless power transfer

ASJC Scopus subject areas

Modelling and Simulation
Computer Science Applications
Electrical and Electronic Engineering

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abstract = "This letter shows that wirelessly powered backscatter communications is subject to a fundamental tradeoff between the harvested energy at the tag and the reliability of the backscatter communication, measured in terms of SNR at the reader. Assuming the RF transmit signal is a multisine waveform adaptive to the channel state information, we derive a systematic approach to optimize the transmit waveform weights (amplitudes and phases) in order to enlarge as much as possible the SNR-energy region. Performance evaluations confirm the significant benefits of using multiple frequency components in the adaptive transmit multisine waveform to exploit the nonlinearity of the rectifier and a frequency diversity gain.",

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