Ambient backscatter communication is an emerging and promising low-energy technology for the Internet of Things. In such a system, a tag sends a binary message to a reader by backscattering a radio frequency signal generated by an ambient source. The tag can operate without battery and without generating additional radio waves. However, the tag-to-reader link suffers from the source-to-reader interference. In this paper, we propose a polarization-based reconfigurable antenna in order to improve the robustness of the tag-to-reader link against the source-to-reader direct interference. More precisely, we compare different types of tags’ antennas, different tags’ encoding schemes, and different detectors at the reader. By using analysis, numerical simulations, and experiments, we show that a polarization-based reconfigurable tag with four polarization directions significantly outperforms a non-reconfigurable tag, and provides almost the same performance as an ideal reconfigurable tag with a large number of reconfigurable polarization patterns.

中文翻译：

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基于极化的可重配置标签，用于稳定的环境背向散射通信

环境背向散射通信是物联网的一种新兴且有前途的低能耗技术。在这样的系统中，标签通过反向散射环境源产生的射频信号，将二进制消息发送到读取器。标签可以在没有电池且不产生其他无线电波的情况下运行。但是，标签到阅读器的链接会受到源到阅读器的干扰。在本文中，我们提出了一种基于极化的可重配置天线，以提高标签到阅读器链接对源到阅读器直接干扰的鲁棒性。更准确地说，我们在阅读器上比较了不同类型的标签的天线，不同标签的编码方案和不同的检测器。通过使用分析，数值模拟和实验，