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

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