[en] In this paper, we investigate the hybrid beamforming problem in joint radar-communications at terahertz (THz) bands. In order to address the extremely high attenuation at THz, ultra-massive multiple-input multiple-output (UM-MIMO) antenna systems have been proposed for THz communications to compensate propagation losses. Further, we propose a new group-of-subarrays (GoSA) UM-MIMO structure to reduce the hardware cost. We formulate the GoSA beamformer design as an optimization problem to provide a trade-off between the unconstrained communications beamformers and the desired radar beamformers. Numerical experiments demonstrate that the proposed approach outperforms the conventional approaches in terms of spectral efficiency and hardware costs.
Disciplines :
Computer science
Author, co-author :
Elbir, Ahmet M.
Mishra, Kumar Vjiay
Chatzinotas, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
External co-authors :
yes
Language :
English
Title :
Hybrid Beamforming for Terahertz Joint Ultra-Massive MIMO Radar-Communications
Publication date :
November 2021
Journal title :
IEEE Journal of Selected Topics in Signal Processing
ISSN :
1941-0484
Publisher :
Institute of Electrical and Electronics Engineers, New York, United States - New York