University of Oulu

N. T. Nguyen, N. Shlezinger, Y. C. Eldar and M. Juntti, "Multiuser MIMO Wideband Joint Communications and Sensing System With Subcarrier Allocation," in IEEE Transactions on Signal Processing, vol. 71, pp. 2997-3013, 2023, doi: 10.1109/TSP.2023.3302622.

Multiuser MIMO wideband joint communications and sensing system with subcarrier allocation

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Author: Nguyen, Nhan Thanh1; Shlezinger, Nir2; Eldar, Yonina C.3;
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
2School of ECE, Ben-Gurion University of the Negev, Beer-Sheva, Israel
3Faculty of Math and CS, Weizmann Institute of Science, Rehovot, Israel
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-08-29


In wideband joint communications and sensing (JCAS) systems, the waveforms are often designed and optimized over the entire bandwidth. This significantly limits the degrees of freedom in beamforming and causes severe communications performance loss, especially under a strict radar sensing constraint. In this work, we consider a downlink of a wideband multiuser (MU) multiple-input multiple-output (MIMO) system. We propose a subcarrier allocation strategy incorporated in an efficient JCAS design to improve the communications–sensing performance tradeoff of the system. The main idea is to employ a subset of subcarriers for radar sensing while enabling communications over the entire bandwidth. This creates dedicated subcarriers for communications without any interference from the radar function, whose sensing accuracy can still be guaranteed through strict design constraints. To realize the idea, we formulate the sum rate maximization problem and propose a three-step solution based on successive convex approximation and Riemannian manifold optimization. We further propose efficient initialization methods to reduce complexity and improve the convergence of the employed optimization schemes. Our simulation results for a 32 × 4 MU-MIMO system show that the proposed scheme offers 70% improvement in the system sum rate while guaranteeing the same radar beampattern mean square error and requiring less radio frequency chains compared with the conventional JCAS design over the entire bandwidth.

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Series: IEEE transactions on signal processing
ISSN: 1053-587X
ISSN-E: 1941-0476
ISSN-L: 1053-587X
Volume: 71
Pages: 2997 - 3013
DOI: 10.1109/tsp.2023.3302622
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research was supported by Academy of Finland under 6G Flagship (grant 346208), EERA Project (grant 332362), Infotech Oulu, Business Finland, Keysight, MediaTek, Siemens, Ekahau and Verkotan via project 6GLearn.
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
332362 (Academy of Finland Funding decision)
Copyright information: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see