Passive Wi-Fi-based Radars with 802.11ax MU-MIMO Signals: AoD Estimation with a Single Antenna
(2023) 2023 IEEE 3rd International Symposium on Joint Communications & Sensing (JC&S) — Location: Seefeld, Austria (5.March.2023)
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- Passive Wi-Fi based Radar (PWR) is a device that makes use of existing Wi-Fi signals to detect/track targets in the environment. Therefore, the radar processing at the PWR largely depends on the Wi-Fi signal and its characteristics. In the latest amendment of the Wi-Fi standard, namely 802.11ax, Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology is used to improve the spatial efficiency of the wireless channel by precoding the transmitted signal for each user. However, from the PWR perspective, precoding affects the signal power that illuminates a given target depending on its Angle-of-Departure (AoD). In this paper, we first quantify the impact of precoded signals on PWR processing. Then, we show that it is possible to recover the AoD of well-illuminated targets by using a PWR equipped with a single-antenna. To do so, a three-step-scheme, which works by exploiting the MU-MIMO synchronization and precoded signal transmission, is proposed. The accuracy of the proposed method, as well as its shortcomings are shown through numerical analyses.
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Yildirim, H., Storrer, L., Willame, M., Louveaux, J., De Doncker, P., & Horlin, F. (2023). Passive Wi-Fi-based Radars with 802.11ax MU-MIMO Signals: AoD Estimation with a Single Antenna. 2023 IEEE 3rd International Symposium on Joint Communications & Sensing (JC&S). Published. 2023 IEEE 3rd International Symposium on Joint Communications & Sensing (JC&S), Seefeld, Austria. https://doi.org/10.1109/JCS57290.2023.10107509