Long-range ambient LoRa backscatter with parallel decoding

Jinyan Jiang, Zhenqiang Xu, Fan Dang, Jiliang Wang
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引用次数: 36

Abstract

LoRa backscatter is a promising technology to achieve low-power and long-distance communication for connecting millions of devices in the Internet of Things. We present P2LoRa, the first ambient LoRa backscatter system with parallel decoding and long-range communication. The high level idea of P2LoRa is to modulate data by shifting ambient LoRa packets with a small frequency. To achieve long distance communication, we enhance the SNR of the backscatter signal by concentrating leaked energy in both the frequency domain and time domain. We propose a method to accurately reconstruct and cancel the in-band excitation signal, which is orders of magnitude higher than the backscatter signal. For parallel decoding, we propose a method to cancel inter-tag interference with very low overhead and address the signal misalignment problem due to different time of flight. We prototype the P2LoRa tag with customized low-cost hardware and implement the P2LoRa gateway on USRP. Through extensive evaluations, we show that P2LoRa achieves a long communication distance of 2.2 km with ambient LoRa, and supports 101 parallel tag transmissions.
远距离环境LoRa后向散射并行解码
LoRa反向散射是一种很有前途的技术,可以实现连接物联网中数百万设备的低功耗和远距离通信。我们提出了P2LoRa,这是第一个具有并行解码和远程通信的环境LoRa反向散射系统。P2LoRa的高级思想是通过以小频率移动环境LoRa数据包来调制数据。为了实现远距离通信,我们通过在频域和时域集中泄漏能量来提高后向散射信号的信噪比。我们提出了一种精确地重建和消除比后向散射信号高几个数量级的带内激励信号的方法。对于并行解码,我们提出了一种低开销消除标签间干扰的方法,并解决了由于飞行时间不同而导致的信号失调问题。我们使用定制的低成本硬件原型化了P2LoRa标签,并在USRP上实现了P2LoRa网关。通过广泛的评估,我们表明P2LoRa与环境LoRa实现了2.2 km的长距离通信距离,并支持101个并行标签传输。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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