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NOMA-based improper signaling for multicell MISO RIS-assisted broadcast channels

Abstract: In this paper, we study the performance of reconfigurable intelligent surfaces (RISs) in a multicell broadcast channel (BC) that employs improper Gaussian signaling (IGS) jointly with non-orthogonal multiple access (NOMA) to optimize either the minimum-weighted rate or the energy efficiency (EE) of the network. We show that although the RIS can significantly improve the system performance, it cannot mitigate interference completely, so we have to employ other interference-management techniques to further improve performance. We show that the proposed NOMA-based IGS scheme can substantially outperform proper Gaussian signaling (PGS) and IGS schemes that treat interference as noise (TIN) in particular when the number of users per cell is larger than the number of base station (BS) antennas (referred to as overloaded networks). In other words, IGS and NOMA complement to each other as interference management techniques in multicell RIS-assisted BCs. Furthermore, we consider three different feasibility sets for the RIS components showing that even a RIS with a small number of elements provides considerable gains for all the feasibility sets.

 Autoría: Soleymani M., Santamaria I., Jorswieck E., Rezvani S.,

 Fuente: IEEE Transactions on Signal Processing, 2023, 71, 963-978

 Editorial: Institute of Electrical and Electronics Engineers, Inc.

 Fecha de publicación: 20/03/2023

 Nº de páginas: 16

 Tipo de publicación: Artículo de Revista

 DOI: 10.1109/TSP.2023.3259145

 ISSN: 1053-587X,1941-0476

 Proyecto español: PID2019-104958RB-C43

 Url de la publicación: http://doi.org/10.1109/TSP.2023.3259145

Autoría

SOLEYMANI, MOHAMMAD

JORSWIECK, EDUARD

REZVANI, SEPEHR