Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems
Rate-Splitting Multiple Access (RSMA) has emerged as a robust transmission strategy for multi-antenna wireless systems. This paper investigates the performance of RSMA in a downlink Decode-and-Forward (DF) relay network under imperfect Channel State Information (CSI) at both the transmitter and the...
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Communications Society |
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| Online Access: | https://ieeexplore.ieee.org/document/10965750/ |
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| author | Ahmet Sacid Sumer Mehmet Mert Sahin Huseyin Arslan |
| author_facet | Ahmet Sacid Sumer Mehmet Mert Sahin Huseyin Arslan |
| author_sort | Ahmet Sacid Sumer |
| collection | DOAJ |
| description | Rate-Splitting Multiple Access (RSMA) has emerged as a robust transmission strategy for multi-antenna wireless systems. This paper investigates the performance of RSMA in a downlink Decode-and-Forward (DF) relay network under imperfect Channel State Information (CSI) at both the transmitter and the relay. The system operates in two phases: in the first phase, the Base Station (BS) transmits signals to both BS Users (BUs) and the relay; in the second phase, the relay decodes and forwards the signals to Relay Users (RUs) located outside the BS coverage area. RSMA is employed for facilitating transmission from both the BS and the relay. To optimize the network performance, we derive a tractable lower bound for the ergodic sum-rate, which enables the power allocation coefficients of common and private streams in the RSMA structures to maximize the overall sum-rate in both phases. The simulation results demonstrate that the proposed power allocation algorithm, coupled with a low-complexity precoding design, significantly improves the sum-rate performance of DF relay RSMA networks compared to scenarios where RSMA is not utilized. Notably, RSMA outperforms Spatial Division Multiple Access (SDMA)-based benchmarks, achieving sum-rate gains of up to 81%. Furthermore, a three-user use-case scenario is examined, revealing that RSMA consistently surpasses Non-Orthogonal Multiple Access (NOMA) and Orthogonal Multiple Access (OMA)-based benchmarks, even in the presence of imperfect channel state information (CSI) at both the transmitter and the relay. |
| format | Article |
| id | doaj-art-8a169323c140408e9514ecc011697db8 |
| institution | OA Journals |
| issn | 2644-125X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| series | IEEE Open Journal of the Communications Society |
| spelling | doaj-art-8a169323c140408e9514ecc011697db82025-08-20T02:14:42ZengIEEEIEEE Open Journal of the Communications Society2644-125X2025-01-0163904391910.1109/OJCOMS.2025.356082610965750Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay SystemsAhmet Sacid Sumer0https://orcid.org/0000-0001-8866-8520Mehmet Mert Sahin1https://orcid.org/0000-0001-5401-2427Huseyin Arslan2https://orcid.org/0000-0001-9474-7372Department of Electrical and Electronics Engineering, Istanbul Medipol University, Istanbul, TürkiyeSamsung Research America, Samsung Electronics Company Ltd., Plano, TX, USADepartment of Electrical and Electronics Engineering, Istanbul Medipol University, Istanbul, TürkiyeRate-Splitting Multiple Access (RSMA) has emerged as a robust transmission strategy for multi-antenna wireless systems. This paper investigates the performance of RSMA in a downlink Decode-and-Forward (DF) relay network under imperfect Channel State Information (CSI) at both the transmitter and the relay. The system operates in two phases: in the first phase, the Base Station (BS) transmits signals to both BS Users (BUs) and the relay; in the second phase, the relay decodes and forwards the signals to Relay Users (RUs) located outside the BS coverage area. RSMA is employed for facilitating transmission from both the BS and the relay. To optimize the network performance, we derive a tractable lower bound for the ergodic sum-rate, which enables the power allocation coefficients of common and private streams in the RSMA structures to maximize the overall sum-rate in both phases. The simulation results demonstrate that the proposed power allocation algorithm, coupled with a low-complexity precoding design, significantly improves the sum-rate performance of DF relay RSMA networks compared to scenarios where RSMA is not utilized. Notably, RSMA outperforms Spatial Division Multiple Access (SDMA)-based benchmarks, achieving sum-rate gains of up to 81%. Furthermore, a three-user use-case scenario is examined, revealing that RSMA consistently surpasses Non-Orthogonal Multiple Access (NOMA) and Orthogonal Multiple Access (OMA)-based benchmarks, even in the presence of imperfect channel state information (CSI) at both the transmitter and the relay.https://ieeexplore.ieee.org/document/10965750/Decode-and-forward relaysergodic sum-ratelinear precodingMU-MIMOrate splitting multiple access (RSMA) |
| spellingShingle | Ahmet Sacid Sumer Mehmet Mert Sahin Huseyin Arslan Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems IEEE Open Journal of the Communications Society Decode-and-forward relays ergodic sum-rate linear precoding MU-MIMO rate splitting multiple access (RSMA) |
| title | Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems |
| title_full | Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems |
| title_fullStr | Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems |
| title_full_unstemmed | Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems |
| title_short | Low-Complexity RSMA Approach for Enhanced Multi-User Decode-and-Forward Relay Systems |
| title_sort | low complexity rsma approach for enhanced multi user decode and forward relay systems |
| topic | Decode-and-forward relays ergodic sum-rate linear precoding MU-MIMO rate splitting multiple access (RSMA) |
| url | https://ieeexplore.ieee.org/document/10965750/ |
| work_keys_str_mv | AT ahmetsacidsumer lowcomplexityrsmaapproachforenhancedmultiuserdecodeandforwardrelaysystems AT mehmetmertsahin lowcomplexityrsmaapproachforenhancedmultiuserdecodeandforwardrelaysystems AT huseyinarslan lowcomplexityrsmaapproachforenhancedmultiuserdecodeandforwardrelaysystems |