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

Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff
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DOI：
10.1109/lcomm.2017.2716341
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发表时间：
2017-03
期刊：
IEEE Communications Letters
影响因子：
--
通讯作者：
B. Clerckx;Zati Bayani Zawawi;Kaibin Huang
B. Clerckx;Zati Bayani Zawawi;Kaibin Huang
中科院分区：
其他
文献类型：
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作者：
B. Clerckx;Zati Bayani Zawawi;Kaibin Huang

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这封信表明，无线供电的反向散射通信需要在标签处收集的能量与反向散射通信的可靠性（以阅读器的信噪比来衡量）之间进行基本权衡。假设射频发射信号是适应信道状态信息的多正弦波形，我们推导出一种系统方法来优化发射波形权重（幅度和相位），以尽可能扩大 SNR 能量区域。性能评估证实了在自适应发射多正弦波形中使用多个频率分量来利用整流器的非线性和频率分集增益的显着优势。
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.