On the Energy Efficiency of One-Layer SISO Rate-Splitting Multiple Access

Wilson De Souza Junior, Victor Croisfelt, Taufik Abrao

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)


Rate-splitting multiple access (RSMA) combines the concepts of non-orthogonal multiple access (NOMA) and space-division multiple access (SDMA) to provide higher sum-rates (SRs). In particular, one-layer RSMA splits the users' message into two parts: a single common message for all users and a private message for each user. In this work, we consider the problem of maximizing the downlink (DL) energy efficiency (EE) for one-layer RSMA subject to specific quality of service (QoS) constraints and under consideration of a single-input single-output (SISO) system. The solution to this multi-objective problem depends on finding: i) the optimal DL transmit powers, ii) the optimal rate allocation, and iii) the optimal radio frequency (RF) transmit power that must be selected by the base station (BS) so as to obtain the best EE. Thus, we decouple the original problem into three sub-problems that find each part of the solution sequentially. We take advantage of an earlier solution available in the literature for the first two decoupled sub-problems and extend it to an algorithm that maximizes the EE. Numerical results demonstrate consistent performance bounds of our proposed algorithm to the optimal EE values, comparing them to NOMA and orthogonal multiple access (OMA) solutions.

Original languageEnglish
Title of host publication2021 IEEE URUCON, URUCON 2021
Number of pages5
PublisherInstitute of Electrical and Electronics Engineers Inc.
Publication date2021
ISBN (Electronic)9781665424431
Publication statusPublished - 2021
Event2021 IEEE URUCON, URUCON 2021 - Montevideo, Uruguay
Duration: 24 Nov 202126 Nov 2021


Conference2021 IEEE URUCON, URUCON 2021
Series2021 IEEE URUCON, URUCON 2021

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported in part by the CNPq of Brazil under Grant 310681/2019-7, and by CAPES Foundation; Finance Code 001.

Publisher Copyright:
© 2021 IEEE.


  • Energy efficiency (EE)
  • Rate-splitting multiple access (RSMA)
  • Single-input single-output (SISO)


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