Batch localization based on OFDMA backscater
Batch localization based on OFDMA backscater
复制标题
基于 OFDMA 反向散射的批量定位
DOI：
10.1145/3314412
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发表时间：
2019
影响因子：
--
通讯作者：
Xinbing Wang
中科院分区：
文献类型：
--
作者：
Xinyu Tong;Fengyuan Zhu;Yang Wan;Xiaohua Tian;Xinbing Wang
OFDMA Wi-Fi反向散射可以显着提高通信效率，同时保持超低功耗；然而，对传统Wi-Fi系统核心机制的彻底改造彻底改变了许多现有基于Wi-Fi的机制的基础。在本文中，我们探讨了如何基于 OFDMA 反向散射实现定位，并提出了一种利用 OFDMA 反向散射系统中的并发通信的批量定位机制。我们提出了一系列机制来应对新范式带来的假设的根本变化。首先，我们在接收器处以更细的粒度处理信号以进行信号分类。然后我们在不中断通信的情况下实时消除相位偏移。最后，我们提出了一种扩展的 MUSIC 算法，以提高 OFDMA 反向散射机制中有限定位信息的精度。我们在WARP中实现了802.11g框架下的原型，在此基础上我们进行了全面的实验来评估我们提出的机制。结果表明，我们的系统可以同时定位 48 个标签，同时实现平均定位误差在 0.49m 以内。该标签的功耗约为55-81.3μW。
OFDMA Wi-Fi backscatter can significantly improve the communication efficiency and meanwhile maintain ultra-low power consumption; however, the ground-up reworking on the core mechanism of traditional Wi-Fi system revolutionizes the basis of many existing Wi-Fi based mechanisms. In this paper, we explore how localization can be realized based on OFDMA backscatter, where a batch localization mechanism utilizing concurrent communication in the OFDMA backscatter system is proposed. We present a series of mechanisms to deal with the fundamental change of assumptions brought by the new paradigm. First, we process signals at the receiver in a finer granularity for signal classification. Then we remove phase offsets in real time without interrupting the communication. Finally, we propose an extended MUSIC algorithm to improve accuracy with limited localization information in OFDMA backscatter mechanism. We implement a prototype under the 802.11g framework in WARP, based on which we conduct comprehensive experiments to evaluate our propose mechanism. Results show that our system can localize 48 tags simultaneously, while achieving average localization errors within 0.49m. The tag's power consumption is about 55-81.3μW.