Babu, Nithin;
Kosasih, Alva;
Masouros, Christos;
Björnson, Emil;
(2024)
Symbol-Level Precoding for Near-Field ISAC.
IEEE Communications Letters
, 28
(9)
2041 -2045.
10.1109/lcomm.2024.3438882.
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Abstract
The forthcoming 6G and beyond wireless networks are anticipated to introduce new groundbreaking applications, such as Integrated Sensing and Communications (ISAC), potentially leveraging much wider bandwidths at higher frequencies and using significantly larger antenna arrays at base stations. This puts the system operation in the radiative near-field regime of the BS antenna array, characterized by spherical rather than flat wavefronts. In this paper, we refer to such a system as near-field ISAC. Unlike the far-field regime, the near-field regime allows for precise focusing of transmission beams on specific areas, making it possible to simultaneously determine a target’s direction and range from a single base station and resolve targets located in the same direction. This work designs the transmit symbol vector in near-field ISAC to maximize a weighted combination of sensing and communication performances subject to a total power constraint using symbol-level precoding (SLP). The formulated optimization problem is convex, and the solution is used to estimate the angle and range of the considered targets using the 2D MUSIC algorithm. The simulation results suggest that the SLP-based design outperforms the block-level-based counterpart. Moreover, the 2D MUSIC algorithm accurately estimates the targets’ parameters.
| Type: | Article |
|---|---|
| Title: | Symbol-Level Precoding for Near-Field ISAC |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/lcomm.2024.3438882 |
| Publisher version: | https://doi.org/10.1109/lcomm.2024.3438882 |
| 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: | Near-field, ISAC, CRB, symbol-level precoding, beamfocusing |
| 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/10195975 |
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