13 papers
Hybrid Monostatic and Bistatic Sensing for Target Localization in OFDM Systems under Phase Noise
Lucía Pallarés Rodríguez, Musa Furkan Keskin, Alireza Pourafzal +3
In hybrid monostatic-bistatic orthogonal frequency-division multiplexing (OFDM) sensing, each sensing node receives a superposition of monostatic and bistatic target returns, whose…
UE-Side Location Privacy for 5G NR Uplink Positioning: Mechanisms and Trade-offs
Giulia Focarelli, Alireza Pourafzal, Henk Wymeersch +1
Future 5G-Advanced and 6G networks increasingly reuse uplink communication waveforms for positioning and sensing. This raises privacy concerns, as user equipments (UEs) may uninten…
Task-Aware Beamforming for Semantic Wireless Localization
Mohammad Mahdi Mojahedian, Alireza Pourafzal, Musa Furkan Keskin +1
Many semantic localization tasks require determining a contextually meaningful region or state rather than minimizing the error of a full Cartesian position estimate. In such setti…
Dual-Orthogonality Waveforms for Integrated Communication and Imaging in Dynamic Multipath Channels
Edoardo Talignani, Francesco Linsalata, Musa Furkan Keskin +4
Dual-Orthogonality waveforms are multi-antenna signaling schemes that enforce mutual orthogonality across transmit channels and over a prescribed set of delay shifts. By relaxing s…
On-Site Beam Calibration for RIS-Aided Positioning Systems
Mengting Li, Hui Chen, Sigurd S. Petersen +5
High precision positioning is a key enabler for next-generation communication applications such as smart transportation and augmented reality. Reconfigurable intelligent surface (R…
From Pilot to Precoding Design: Blind Angular Spoofing For Location Privacy in MIMO Systems
Priyanka Maity, Lorenzo Italiano, Alireza Pourafzal +4
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. W…
Mismatch Analysis and Cooperative Calibration of Array Beam Patterns for ISAC Systems
Hui Chen, Mengting Li, Alireza Pourafzal +6
Integrated sensing and communication (ISAC) is a key technology for enabling a wide range of applications in future wireless systems. However, the sensing performance is often degr…
Pilot Distortion Design for ToA Obfuscation in Uplink OFDM Communication
Mahmut Kemal Ercan, Alireza Pourafzal, Musa Furkan Keskin +2
We study uplink orthogonal frequency-division multiplexing (OFDM) pilot distortion to deliberately obfuscate time-of-arrival (ToA) estimation at a single base station while preserv…
HoloTrace: a Location Privacy-Preserving Framework for mmWave MIMO-OFDM Systems
Lorenzo Italiano, Alireza Pourafzal, Hui Chen +4
High-resolution radio localization is becoming increasingly important for next-generation vehicular and mobile networks, enabling infrastructure-assisted positioning for connected…
RIS Beam Calibration for ISAC Systems: Modeling and Performance Analysis
Mengting Li, Hui Chen, Sigurd Sandor Petersen +5
High-accuracy localization is a key enabler for integrated sensing and communication (ISAC), playing an essential role in various applications such as autonomous driving. Antenna a…
Privacy Preservation in MIMO-OFDM Localization Systems: A Beamforming Approach
Yuchen Zhang, Hui Chen, Musa Furkan Keskin +4
We investigate an uplink MIMO-OFDM localization scenario where a legitimate base station (BS) aims to localize a user equipment (UE) using pilot signals transmitted by the UE, whil…
Joint Near-Field Sensing and Visibility Region Detection with Extremely Large Aperture Arrays
Huiping Huang, Alireza Pourafzal, Hui Chen +6
In this paper, we consider near-field localization and sensing with an extremely large aperture array under partial blockage of array antennas, where spherical wavefront and spatia…
RIS-Aided Positioning Under Adverse Conditions: Interference from Unauthorized RIS
Mengting Li, Hui Chen, Alireza Pourafzal +1
Positioning technology, which aims to determine the geometric information of a device in a global coordinate, is a key component in integrated sensing and communication systems. In…