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Optimization of rate-splitting multiple access in beyond diagonal RIS-assisted URLLC systems

Abstract: This paper proposes a general optimization framework for rate splitting multiple access (RSMA) in beyond diagonal (BD) reconfigurable intelligent surface (RIS) assisted ultra-reliable low-latency communications (URLLC) systems. This framework can provide a suboptimal solution for a large family of optimization problems in which the objective and/or constraints are linear functions of the rates and/or energy efficiency (EE) of users. Using this framework, we show that RSMA and RIS can be mutually beneficial tools when the system is overloaded, i.e., when the number of users per cell is higher than the number of base station (BS) antennas. Additionally, we show that the benefits of RSMA increase when the packets are shorter and/or the reliability constraint is more stringent. Furthermore, we show that the RSMA benefits increase with the number of users per cell and decrease with the number of BS antennas. Finally, we show that RIS (either diagonal or BD) can highly improve the system performance, and BD-RIS outperforms regular RIS.

 Authorship: Soleymani M., Santamaria I., Jorswieck E.A., Clerckx B.,

 Fuente: IEEE Transactions on Wireless Communications, 2024, 23(5) 5063-5074

 Publisher: Institute of Electrical and Electronics Engineers Inc.

 Publication date: 01/05/2024

 No. of pages: 16

 Publication type: Article

 DOI: 10.1109/TWC.2023.3324190

 ISSN: 1536-1276

 Spanish project: PID2022-137099NB-C43

 Publication Url: https://doi.org/10.1109/TWC.2023.3324190

Authorship

SOLEYMANI, MOHAMMAD

JORSWIEC, EDUARD A.

CLERCKX, BRUNO