论文标题
消除障碍：揭开Wi-Fi基带设计并引入Picoscenes Wi-Fi感应平台
Eliminating the Barriers: Demystifying Wi-Fi Baseband Design and Introducing the PicoScenes Wi-Fi Sensing Platform
论文作者
论文摘要
在过去的十年中，有关Wi-Fi感测的研究一直在蓬勃发展，但该过程并不顺利。三个障碍总是妨碍研究：未知的基带设计及其影响力，硬件不足以及缺乏多功能和灵活的测量软件。本文试图通过以下工作消除这些障碍。首先，我们对高通Atheros AR9300（QCA9300）NIC的基带设计进行了深入研究。我们确定了现有CSI模型的缺失项目，即CSI失真，并将基带滤波器识别为其原点。我们还提出了一种失真去除方法。其次，我们重新引入了QCA9300和软件定义的无线电（SDR）作为功能强大的硬件。对于QCA9300，我们解锁了载波频率和带宽的任意调整。对于SDR，我们开发了802.11A/g/n/ac/ax基带的高性能软件实现，使用户可以完全控制基带并访问完整的物理层信息。第三，我们发布了Picoscenes软件，该软件支持来自多个QCA9300，Intel Wireless Link（IWL5300）和SDR硬件的并发CSI测量。 Picoscenes具有丰富的低级控件，数据包注入和软件基带实现。它还允许用户开发自己的测量插件。最后，我们报告了对Picoscenes系统的广泛评估，例如QCA9300上的> 2 GHz可用频谱，同时进行的CSI测量以及QCA9300和SDR达到的最高40 kHz和1 kHz CSI测量率。 Picoscenes可从https://ps.zpj.io获得。
The research on Wi-Fi sensing has been thriving over the past decade but the process has not been smooth. Three barriers always hamper the research: unknown baseband design and its influence, inadequate hardware, and the lack of versatile and flexible measurement software. This paper tries to eliminate these barriers through the following work. First, we present an in-depth study of the baseband design of the Qualcomm Atheros AR9300 (QCA9300) NIC. We identify a missing item of the existing CSI model, namely, the CSI distortion, and identify the baseband filter as its origin. We also propose a distortion removal method. Second, we reintroduce both the QCA9300 and software-defined radio (SDR) as powerful hardware for research. For the QCA9300, we unlock the arbitrary tuning of both the carrier frequency and bandwidth. For SDR, we develop a high?performance software implementation of the 802.11a/g/n/ac/ax baseband, allowing users to fully control the baseband and access the complete physical-layer information. Third, we release the PicoScenes software, which supports concurrent CSI measure?ment from multiple QCA9300, Intel Wireless Link (IWL5300) and SDR hardware. PicoScenes features rich low-level controls, packet injection and software baseband implementation. It also allows users to develop their own measurement plugins. Finally, we report state-of-the-art results in the extensive evaluations of the PicoScenes system, such as the >2 GHz available spectrum on the QCA9300, concurrent CSI measurement, and up to 40 kHz and 1 kHz CSI measurement rates achieved by the QCA9300 and SDR. PicoScenes is available at https://ps.zpj.io.
