@conference{10902/35438,
year = {2023},
url = {https://hdl.handle.net/10902/35438},
abstract = {This paper proposes schemes to improve the spectral efficiency of a multiple-input multiple-output (MIMO) broadcast channel (BC) with I/Q imbalance (IQI) at transceivers by employing a combination of improper Gaussian signaling (IGS), non-orthogonal multiple access (NOMA) and simultaneously transmit and reflect (STAR) reconfigurable intelligent surface (RIS). When there exists IQI, the output RF signal is a widely linear transformation of the input signal, which may make the output signal improper. To compensate for IQI, we employ IGS, thus generating a transmit improper signal. We show that IGS alongside with NOMA can highly increase the minimum rate of the users. Moreover, we propose schemes for different operational modes of STAR-RIS and show that STAR-RIS can significantly improve the system performance. Additionally, we show that IQI can highly degrade the performance especially if it is overlooked in the design.},
organization = {The work of I. Santamaria was supported by Ministerio de Ciencia e Innovaciòn and AEI (10.13039/501100011033), under grants PID2019104958RB-C43(ADELE) and PID2022- 137099NB-C43 (MADDIE). The work of Eduard Jorswieck was supported in part by the Federal Ministry of Education and Research (BMBF, Germany) as part of the 6G Research and Innovation Cluster 6G-RIC under Grant 16KISK031.},
publisher = {Institute of Electrical and Electronics Engineers, Inc.},
publisher = {IEEE Global Communications Conference (GLOBECOM), Kuala Lumpur, Malaysia, 2023, 673-678},
title = {NOMA-based improper signaling for MIMO STAR-RIS-assisted broadcast channels with hardware impairments},
author = {Soleymani, Mohammad and Santamaría Caballero, Luis Ignacio and Jorswieck, Eduard},
}