Abstract
This paper 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 |
|---|---|
| Journal | IEEE Communications Letters |
| DOIs | |
| Publication status | Accepted/In press - 2017 Jun 16 |
Keywords
- Antennas
- Backscatter
- Backscatter Communications
- Frequency diversity
- Radio frequency
- Signal to noise ratio
- SNR-Energy Tradeoff
- Transmitters
- Waveform Design
- Wireless communication
- Wireless Power Transfer
ASJC Scopus subject areas
- Modelling and Simulation
- Computer Science Applications
- Electrical and Electronic Engineering
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Cite this
Clercks, B., Zawawi, Z. B., & Huang, K. (Accepted/In press). Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff. IEEE Communications Letters. https://doi.org/10.1109/LCOMM.2017.2716341