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14(1)2024

A sum rate maximization problem in uplink MIMO with RSMA systems


Author - Affiliation:
Phung Truong - Sejong University, Seoul
Corresponding author: Phung Truong - thanhphung2110@gmail.com
Submitted: 07-09-2023
Accepted: 23-10-2023
Published: 05-03-2024

Abstract
This study explores the problem of maximizing the sum rate in uplink multi-user Multiple-Input Multiple-Output (MIMO) using Rate-Splitting Multiple Access (RSMA) systems. The investigation revolves around the scenario where the Users (UEs) are single-antenna nodes transmitting data to a multi-antenna Base Station (BS) through the RSMA technique. The optimization process encompasses determining parameters such as UEs’ transmit powers, decoding order, and detection vector at the BS. An approach based on Deep Reinforcement Learning (DRL) is introduced to address this challenge. This DRL framework involves an action-refined stage and applies a Deep Deterministic Policy Gradient (DDPG)-based strategy. Simulation outcomes effectively demonstrate the convergence of the proposed DRL framework, where it converges after approximately 1,800 episodes. Also, the results prove the superior performance of the proposed method when compared to established benchmark strategies, where it is up to 45% and 86% higher than the local search and random schemes, respectively.

Keywords
deep reinforcement learning; multiple-input multiple-output; rate splitting multiple access; sum rate maximization

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Cite this paper as:

Truong, P. (2024). A sum rate maximization problem in uplink MIMO with RSMA systems. Ho Chi Minh City Open University Journal of Science – Engineering and Technology, 14(1), 13-20. doi:10.46223/HCMCOUJS.tech.en.14.1.2955.2024


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DOI: https://doi.org/10.46223/HCMCOUJS.tech.en.14.1.2955.2024
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© The Author(s) 2024. This is an open access publication under CC BY NC licence.