Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Mao, Yijie; Dizdar, Onur; Clerckx, Bruno; Schober, Robert; Popovski, Petar; Poor, H. Vincent

doi:10.1109/comst.2022.3191937

Cited by 358 publications

(112 citation statements)

References 179 publications

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“…In [23], the authors studied the benefits of MIMO-RSMA in a cloud radio access network, and the multicarrier MIMO-RSMA case was addressed in [24]. For a more complete literature review on the RSMA subject, readers are referred to the work in [25].…”

Section: A Related Workmentioning

confidence: 99%

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Sena

Nardelli

Costa

et al. 2023

IEEE Trans. Wireless Commun.

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The polarization domain provides an extra degree of freedom (DoF) for improving the performance of multiple-input multiple-output (MIMO) systems. This paper takes advantage of this additional DoF to alleviate practical issues of successive interference cancellation (SIC) in rate-splitting multiple access (RSMA) schemes. Specifically, we propose three dual-polarized downlink transmission approaches for a massive MIMO-RSMA network under the effects of polarization interference and residual errors of imperfect SIC. The first approach implements polarization multiplexing for transmitting the users' data messages, which removes the need to execute SIC in the reception. The second approach transmits replicas of users' messages in the two polarizations, which enables users to exploit diversity through the polarization domain. The third approach, in its turn, employs the original SIC-based RSMA technique per polarization, and this allows the BS to transmit two independent superimposed data streams simultaneously. An in-depth theoretical analysis is carried out, in which we derive tight closed-form approximations for the outage probabilities of the three proposed approaches. Accurate approximations for the ergodic sum-rates of the two first schemes are also derived. Simulation results validate the theoretical analysis and confirm the effectiveness of the proposed schemes. For instance, under low to moderate cross-polar interference, the results show that, even under high levels of residual SIC error, our dual-polarized MIMO-RSMA strategies outperform the conventional single-polarized MIMO-RSMA counterpart. It is also shown that the performance of all RSMA schemes is impressively higher than that of single and dual-polarized massive MIMO systems employing nonorthogonal multiple access (NOMA) and orthogonal multiple access (OMA) techniques.

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Section: A Related Workmentioning

confidence: 99%

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Sena

Nardelli

Costa

et al. 2023

IEEE Trans. Wireless Commun.

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“…Multiple Access Schemes: Orthogonal multiple access allows each user to obtain orthogonal communication resources in different degrees of freedom (DoF) [17] [18]. To put it another way, numerous users in OMA are eligible to transmit their signals on orthogonal channels without interference in the user's signal.…”

Section: ) Orthogonalmentioning

confidence: 99%

Outage Probability and Ergodic Capacity Analysis of MIMO-NOMA Heterogeneous Network for 5G System

Rehman¹,

Jafarian²,

Manzar³

et al. 2022

JISR-C

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Based on the orthogonal multiple access (OMA) paradigm, multiple access techniques are now used in wireless networks. The capacity of OMA for orthogonal resources, which is already constrained, will be exceeded in the coming years by the demand for a significant number of users and efficient spectrum usage. Non-orthogonal multiple access (NOMA) is being considered for the next 5G and beyond releases. NOMA can offer high connection, low latency, and excellent spectral efficiency because several users can be handled in the same resource block at once. This work presents a thorough literature evaluation of the MIMO-NOMA and identifies several research gaps. Additionally, using Monte Carlo simulations, For the MIMO-NOMA heterogeneous network, simulation was performed to analyze the outage probability and ergodic capacity. The MIMO-NOMA HetNets system's performance is further evaluated using various SNR levels, number of clusters, user counts per cluster, and antenna count ratios.

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“…(RS) techniques at the transmitter and Successive Interference Cancellation (SIC) at the receivers [1]. Under the RSMA umbrella, various RS architectures have been developed and have been shown to enhance the achievable sum-rate in multi-user multiple-input single-output (MU-MISO) systems [2]- [6].…”

Section: Introductionmentioning

confidence: 99%

“…It then tries to remove them using a second layer of SIC to eavesdrop the k th private signal (unintended private signal). 1 . It further raises some interesting tradeoffs, where on one hand, increasing the split towards the common signals may increase the sum rate of RS, while on the other hand revealing the users' signals may harm the security performance.…”

Section: Introductionmentioning

confidence: 99%

“…a public information intended as a whole to all users in the system, while the common message in RS encapsulates parts of the unicast messages, and its content not necessarily required by all users, although decoded by them all for interference mitigation purposes. Please refer to literature[2],[9],[10],[37],[38] for more details about RS.This article has been accepted for publication in IEEE Transactions on Wireless Communications. This is the author's version which has not been fully edited and content may change prior to final publication.…”

mentioning

confidence: 99%

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Secure Rate Splitting Multiple Access: How Much of the Split Signal to Reveal?

Salem

Masouros

Clerckx

2023

IEEE Trans. Wireless Commun.

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Rate Splitting Multiple Access (RSMA) relies on multi-antenna rate splitting (RS) at the transmitter and successive interference cancellation (SIC) at the receiver. In RS the users' messages are split into a common message and private messages, where the common part is first decoded by the all users, while the private part is decoded only by the intended user using SIC technique. This split of the users' signals into common and private parts raises some interesting tradeoffs between maximizing sum rate versus secrecy rate. In this work we consider the secrecy performance of RSMA in multi-user multiple-input single-output (MU-MISO) systems, where secrecy is defined by the ability of any user to decode the signal intended for user k in the system. To that end, new analytical expressions for the ergodic sum-rate and ergodic secrecy rate are derived for two closed-form precoding techniques of the private messages, namely, 1) zero-forcing (ZF) precoding approach, 2) minimum mean square error (MMSE) approach. Then, based on the analytical expressions of the ergodic rates, novel power allocation strategies that maximize the sum-rate subject to a target secrecy rate for the two precoding schemes are presented and investigated. Our Monte Carlo simulations show a close match with our theoretical derivations. They also reveal that, by tuning the split of the messages, our power allocation approaches provide a scalable tradeoff between rate benefits and secrecy.

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Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Cited by 358 publications

References 179 publications

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

Outage Probability and Ergodic Capacity Analysis of MIMO-NOMA Heterogeneous Network for 5G System

Secure Rate Splitting Multiple Access: How Much of the Split Signal to Reveal?

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