From Pilot to Precoding Design: Blind Angular Spoofing For Location Privacy in MIMO Systems
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| Format: | Preprint |
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2026
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| _version_ | 1866909007877242880 |
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| author | Maity, Priyanka Italiano, Lorenzo Pourafzal, Alireza Seco-Granados, Gonzalo Chen, Hui Nicoli, Monica Wymeersch, Henk |
| author_facet | Maity, Priyanka Italiano, Lorenzo Pourafzal, Alireza Seco-Granados, Gonzalo Chen, Hui Nicoli, Monica Wymeersch, Henk |
| contents | This paper studies location privacy in uplink MIMO systems, where a user equipment seeks to spoof the angular signature observed by a single base station performing localization. We propose a blind analog precoder design that manipulates the perceived angle-of-arrival and angle-of-departure configuration without requiring channel-gain knowledge. The method enforces consistency between the received signal and a desired spoofed angular subspace, and is solved using an alternating optimization algorithm under practical amplitude constraints. Simulations in a multipath scenario show that the proposed approach achieves near-perfect angular spoofing and clearly outperforms pilot-only blind spoofing, which exhibits an error floor. The results also show a trade-off between spoofing accuracy and communication rate, depending on the chosen virtual geometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_00535 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | From Pilot to Precoding Design: Blind Angular Spoofing For Location Privacy in MIMO Systems Maity, Priyanka Italiano, Lorenzo Pourafzal, Alireza Seco-Granados, Gonzalo Chen, Hui Nicoli, Monica Wymeersch, Henk Signal Processing This paper studies location privacy in uplink MIMO systems, where a user equipment seeks to spoof the angular signature observed by a single base station performing localization. We propose a blind analog precoder design that manipulates the perceived angle-of-arrival and angle-of-departure configuration without requiring channel-gain knowledge. The method enforces consistency between the received signal and a desired spoofed angular subspace, and is solved using an alternating optimization algorithm under practical amplitude constraints. Simulations in a multipath scenario show that the proposed approach achieves near-perfect angular spoofing and clearly outperforms pilot-only blind spoofing, which exhibits an error floor. The results also show a trade-off between spoofing accuracy and communication rate, depending on the chosen virtual geometry. |
| title | From Pilot to Precoding Design: Blind Angular Spoofing For Location Privacy in MIMO Systems |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2605.00535 |