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 | |
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