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Opportunistic Sensing Using mmWave Communication Signals: A Subspace Approach

2021; Institute of Electrical and Electronics Engineers; Volume: 20; Issue: 7 Linguagem: Inglês

10.1109/twc.2021.3058775

1558-2248

Emanuele Grossi, Marco Lops, Antonia M. Tulino, Luca Venturino,

Indoor and Outdoor Localization Technologies

In this work, we study the joint detection and localization of multiple delay- and Doppler-spread targets through an opportunistic radar exploiting mmWave communication signals. The problem is formulated as the identification of an unknown number of active subspaces in a large family of subspaces, accounting for the possible positions of potential targets in the delay-Doppler domain: the resulting testing problem is composite and multi-hypothesis. At first, we derive a solution based on the generalized information criterion (GIC), whose complexity is however prohibitive; then, we propose an approximated form of the GIC-based receiver and derive two iterative data-adaptive strategies, both extracting and eliminating the superimposed back-scattered subspace signals one-by-one. Leveraging the IEEE 802.11ad standard, a short-range low-mobility application is discussed to validate the merits of the proposed procedures in terms of detection and localization capabilities, robustness to multi-target interference, and achievable resolution.