{"ID":2827637,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2512.16735","arxiv_id":"2512.16735","title":"Misspecified Crame-Rao Bound for AoA Estimation at a ULA under a Spoofing Attack","abstract":"A framework is presented for analyzing the impact of active attacks to location-based physical layer authentication (PLA) using the machinery of misspecified Cramér--Rao bound (MCRB). In this work, we focus on the MCRB in the angle-of-arrival (AoA) based authentication of a single antenna user when the verifier posseses an $M$ antenna element uniform linear array (ULA), assuming deterministic pilot signals; in our system model the presence of a spoofing adversary with an arbitrary number $L$ of antenna elements is assumed. We obtain a closed-form expression for the MCRB and demonstrate that the attack introduces in it a penalty term compared to the classic CRB, which does not depend on the signal-to-noise ratio (SNR) but on the adversary's location, the array geometry and the attacker precoding vector.","short_abstract":"A framework is presented for analyzing the impact of active attacks to location-based physical layer authentication (PLA) using the machinery of misspecified Cramér--Rao bound (MCRB). In this work, we focus on the MCRB in the angle-of-arrival (AoA) based authentication of a single antenna user when the verifier possese...","url_abs":"https://arxiv.org/abs/2512.16735","url_pdf":"https://arxiv.org/pdf/2512.16735v1","authors":"[\"Sotiris Skaperas\",\"Arsenia Chorti\"]","published":"2025-12-18T16:33:10Z","proceeding":"eess.SP","tasks":"[\"eess.SP\"]","methods":"[]","has_code":false}