On the Performance of Uplink Rate-Splitting Multiple Access

Tegos, Sotiris A.; Diamantoulakis, Panagiotis D.; Karagiannidis, George K.

doi:10.1109/lcomm.2022.3142102

Cited by 38 publications

(15 citation statements)

References 8 publications

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“…However, RSMA is superior over the aforementioned conventional multiple access schemes, as has been demonstrated from various aspects, e.g., in terms of spectral efficiency [8]- [11], max-min achievable rates [6], [12], [13], and ergodic sum-rate [14]. In [15], the performance of two-user uplink RSMA was investigated in terms of outage probability (OP) and throughput. Also, the OP of cooperative H-K signalling has been studied in [16], where the near user relays the common message or the far user to improve the corresponding received signal-to-noise ratio (SNR).…”

Section: A Contextmentioning

confidence: 99%

Rate Splitting in the Presence of Untrusted Users: Outage and Secrecy Outage Performances

Abolpour

Aı̈ssa

Musavian

et al. 2022

IEEE Open J. Commun. Soc.

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In this contribution, a thorough investigation of the performance of rate splitting is conducted in terms of outage and secrecy outage for the simultaneous service to a near user and far user, where the latter attempts to overhear the message of the former. The source transmits a linear combination of the users' common stream and private streams. Once the common stream is retrieved, two decoding strategies can be adopted by each user. In the first strategy, the nodes (near or far) treat the far user's private stream as noise to retrieve the private stream of the near user, then the far user decodes its own stream. In the second strategy, the nodes decode the far user's private stream by treating the one of the near user as noise, then the near user retrieves its private stream while the far user decodes the stream of the near user in its attempt to overhear it. Considering the four decoding combinations, we obtain exact closed-form expressions for the outage probability, and provide tight approximations for the secrecy outage probability. Comparative results are also provided. In particular, it is shown that to achieve better outage probability, with no concern about secrecy, once the decoding of the common stream is completed, each user should first retrieve the private stream with lower target data rate by treating the other private stream as noise. To improve the secrecy outage probability, once the common stream is decoded, the near user must first decode the far user's private stream, and the far user should first retrieve the private stream with lower target data rate.

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Section: A Contextmentioning

confidence: 99%

Rate Splitting in the Presence of Untrusted Users: Outage and Secrecy Outage Performances

Abolpour

Aı̈ssa

Musavian

et al. 2022

IEEE Open J. Commun. Soc.

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show abstract

“…With some manipulations, we find that the first term in ( 19) holds if η s < γs (1 + γp ). For the third term in (19), we know that γp (η s + 1) < γp + γs + γp γs − η s holds if η s < γs , and vice versa. Hence, (19) can be converted to…”

Section: A Outage Probability Of the Cpa Strategymentioning

confidence: 99%

“…For the third term in (19), we know that γp (η s + 1) < γp + γs + γp γs − η s holds if η s < γs , and vice versa. Hence, (19) can be converted to…”

Section: A Outage Probability Of the Cpa Strategymentioning

confidence: 99%

“…Kong et al [18] combined RSMA with beamforming to improve the spectral efficiency of satellite system, and analyzed the average throughput performance. Tegos et al [19] presented closed-form expressions for the outage probability of uplink RSMA transmission considering all possible decoding orders. Following the concept of cognitive radio, Liu et al [20] proposed a dynamic power allocation strategy and analyzed the outage performance for uplink RSMA system.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the effective user scheduling scheme, which can be applied to enhance the system performance, was not studied in the aforementioned literature [14]- [23]. Furthermore, most of the existing work such as [14], [17]- [19], [22]- [24] studied a fixed power allocation strategy, and the flexibility of RSMA transmission has not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Outage Performance of Uplink Rate Splitting Multiple Access with Randomly Deployed Users

Lu¹,

Xie²,

Shi³

et al. 2022

Preprint

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Rate splitting multiple access (RSMA) is a promising solution to improve spectral efficiency and provide better fairness for the upcoming sixth-generation (6G) networks. In this paper, the outage performance of uplink RSMA transmission with randomly deployed users is investigated, taking both user scheduling schemes and power allocation strategies into consideration. Specifically, the greedy user scheduling (GUS) and cumulative distribution function (CDF) based user scheduling (CUS) schemes are considered, which could maximize the rate performance and guarantee scheduling fairness, respectively. Meanwhile, we re-investigate cognitive power allocation (CPA) strategy, and propose a new rate fairnessoriented power allocation (FPA) strategy to enhance the scheduled users' rate fairness. By employing order statistics and stochastic geometry, an analytical expression of the outage probability for each scheduling scheme combining power allocation is derived to characterize the performance. To get more insights, the achieved diversity order of each scheme is also derived. Theoretical results demonstrate that both GUS and CUS schemes applying CPA or FPA strategy can achieve full diversity orders, and the application of CPA strategy in RSMA can effectively eliminate the secondary user's diversity order constraint from the primary user. Simulation results corroborate the accuracy of the analytical expressions, and show that the proposed FPA strategy can achieve excellent rate fairness performance in high signal-to-noise ratio region.

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Green Rate‐Splitting Multiple Access for Multicell and Rate Fairness Maximization

Hu,

Kumari,

Amoon

et al. 2024

Int J Communication

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This paper investigates the green design of rate‐splitting multiple access (RSMA) for multicell, multiantenna downlink communication systems to maximize rate fairness under quality of service (QoS) constraints. An optimization framework is developed to minimize the weighted sum power consumption by jointly optimizing transmit beamformers, power allocation, and common/private rate split while ensuring per‐user minimum rate requirements. The algorithm design explicitly considers the rate fairness among users via a newly proposed green fairness index. The nonconvex transceiver design problems are transformed into tractable forms and efficiently solved by applying tools from alternating optimization and successive convex approximation. Extensive simulations demonstrate that the proposed green RSMA optimization framework can effectively balance the throughput among cell‐edge and cell‐center users, hence combating the near‐far effect. Simulation results show that at 20‐dB SNR, green RSMA achieves over 20% and 50% sum rate improvement compared with NOMA and OMA, respectively. Moreover, green RSMA maintains high fairness among users, even when the channel conditions are disparate. When the weakest user is located 120 m from the base station, green RSMA exhibits a 21.2% higher fairness index than NOMA, showcasing its ability to ensure equitable service quality across users. The framework also achieves substantial energy efficiency gains, consuming less power while providing higher data rates than baseline schemes. These results demonstrate the effectiveness of green RSMA in enhancing spectral efficiency, user fairness, and energy efficiency in multicell, multiantenna communication systems, making it a promising solution for sustainable and high‐performance wireless networks.

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On the Performance of Uplink Rate-Splitting Multiple Access

Cited by 38 publications

References 8 publications

Rate Splitting in the Presence of Untrusted Users: Outage and Secrecy Outage Performances

Rate Splitting in the Presence of Untrusted Users: Outage and Secrecy Outage Performances

Outage Performance of Uplink Rate Splitting Multiple Access with Randomly Deployed Users

Green Rate‐Splitting Multiple Access for Multicell and Rate Fairness Maximization

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