Han, Kawon;
Meng, Kaitao;
Masouros, Christos;
(2025)
MIMO-OFDM Signaling Design for Noncoherent Distributed ISAC Systems.
IEEE Transactions on Wireless Communications
10.1109/twc.2025.3633615.
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Abstract
The ultimate goal of enabling sensing through the cellular network is to obtain coordinated sensing of an unprecedented scale, through distributed integrated sensing and communication (D-ISAC). This, however, introduces challenges related to synchronization and demands new transmission methodologies. In this paper, we propose a transmit signal design framework for noncoherent D-ISAC systems, where multiple ISAC nodes cooperatively perform sensing and communication without requiring phase-level synchronization. The proposed framework employing orthogonal frequency division multiplexing (OFDM) jointly designs downlink coordinated multi-point (CoMP) communication and multi-input multi-output (MIMO) radar waveforms. This leverages both collocated and distributed MIMO radars to estimate angle-of-arrival (AOA) and time-of-flight (TOF) from all possible multi-static measurements for target localization. To this end, we use the target localization Cramér-Rao bound (CRB) as the sensing performance metric and the signal-tointerference-plus-noise ratio (SINR) as the communication performance metric. Then, an optimization problem is formulated to minimize the localization CRB while maintaining a minimum SINR requirement for each communication user. Particularly, we present three distinct transmit signal design approaches, including unconstrained, orthogonal, and beamforming designs, which reveal trade-offs between ISAC performance and computational complexity. Unlike single-node ISAC systems, the proposed DISAC designs involve per-subcarrier sensing signal optimization to enable accurate TOF estimation, which contributes to the target localization performance. Numerical simulations demonstrate the effectiveness of the proposed designs in achieving flexible ISAC trade-offs and efficient D-ISAC signal transmission.
| Type: | Article |
|---|---|
| Title: | MIMO-OFDM Signaling Design for Noncoherent Distributed ISAC Systems |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/twc.2025.3633615 |
| Publisher version: | https://doi.org/10.1109/twc.2025.3633615 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Coordinated multipoint (CoMP), Cramér-Rao bound (CRB), distributed integrated sensing and communication (D-ISAC), multi-input multi-output (MIMO) radar |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10218828 |
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