Link-Level Performance of Rate-Splitting based Downlink Multiuser MISO Systems

Chen, Hongzhi; Mi, De; Chu, Zheng; Xiao, Pei; Xu, Yin; He, Dazhi

doi:10.1109/pimrc48278.2020.9217103

Cited by 13 publications

(11 citation statements)

References 9 publications

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“…3) 1-layer RS: The simplest and most practical RSMA scheme is 1-layer RS, which is the basic building block of almost all existing RSMA schemes. 1-layer RS has been widely studied for the multi-antenna BC with perfect CSIT [53], [74], [76], [78], [80], [81], [84] and imperfect CSIT [56]- [58], [71]- [73], [79], [80], [83], [86]- [88]. Fig.…”

Section: Encoder and Precodermentioning

confidence: 99%

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

Mao,

Dizdar,

Clerckx

et al. 2022

Preprint

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Rate-splitting multiple access (RSMA) has emerged as a novel, general, and powerful framework for the design and optimization of non-orthogonal transmission, multiple access (MA), and interference management strategies for future wireless networks. By exploiting splitting of user messages as well as non-orthogonal transmission of common messages decoded by multiple users and private messages decoded by their corresponding users, RSMA can softly bridge and therefore reconcile the two extreme interference management strategies of fully decoding interference and treating interference as noise. RSMA has been shown to generalize and subsume as special cases four existing MA schemes, namely, orthogonal multiple access (OMA), physical-layer multicasting, space division multiple access (SDMA) based on linear precoding (currently used in the fifth generation wireless network-5G), and non-orthogonal multiple access (NOMA) based on linearly precoded superposition coding with successive interference cancellation (SIC). Through information and communication theoretic analysis, RSMA has been shown to be optimal (from a Degrees-of-Freedom region perspective) in several transmission scenarios. Compared to the conventional MA strategies used in 5G, RSMA enables spectral efficiency (SE), energy efficiency (EE), coverage, user fairness, reliability, and quality of service (QoS) enhancements for a wide range of network loads (including both underloaded and overloaded regimes) and user channel conditions. Furthermore, it enjoys a higher robustness against imperfect channel state information at the transmitter (CSIT) and entails lower feedback overhead and complexity. Despite its great potential to fundamentally change the physical (PHY) layer and media access control (MAC) layer of wireless communication networks, RSMA is still confronted with many challenges on the road towards standardization. In this paper, we present the first comprehensive tutorial on RSMA by providing a survey of the pertinent state-ofthe-art research, detailing its architecture, taxonomy, and various appealing applications, as well as comparing with existing MA schemes in terms of their overall frameworks, performance, and complexities. An in-depth discussion of future RSMA research challenges is also provided to inspire future research on RSMAaided wireless communication for beyond 5G systems.

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Section: Encoder and Precodermentioning

confidence: 99%

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

Mao,

Dizdar,

Clerckx

et al. 2022

Preprint

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“…In previous section, we have investigated the RS based joint precoding and subcarrier allocation design under the Algorithm 1 1: Initialize the iteration index, maximum number of iterations of the 'inner' layer, precoder on each subcarrier {p i, (1) |i ∈ N sc } and subcarrier indicator matrix a (n=1) 2: Phase 1: 'inner' layer 3: Solve ( 15) and ( 19…”

Section: Implementation Design Of Rate-splittingmentioning

confidence: 99%

“…For instance, R c ≥ log 2 M c * r c where the value of M c and r c are selected from all the possible finite constellation alphabet and LDPC data rate. • Same MCS for all streams: Two scenarios occur here: (1) The operating bits per channel use exceeds the optimized rate results, consequently, the error performance might degrade significantly. However, the average number of successfully recovered bits per channel use should be the same as the previous MCS setting, for the following reason: within the optimization process, there is no constraint set on the modulation, which means as long as the identity power constraint is met, any modulation scheme can be applied; after rate optimization, the encoder/decoder are expected to have the optimal performance and the achievable rate is fixed at a certain value, e.g.…”

Section: A Transceiver Designmentioning

confidence: 99%

Rate-Splitting for Multicarrier Multigroup Multicast: Precoder Design and Error Performance

Chen

Wang

et al. 2021

IEEE Trans. on Broadcast.

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Employing multi-antenna rate-splitting (RS) at the transmitter and successive interference cancellation (SIC) at the receivers, has emerged as a powerful transceiver strategy for multi-antenna networks. In this paper, we design RS precoders for an overloaded multicarrier multigroup multicast downlink system, and analyse the error performance. RS splits each group message into degraded and designated parts. The degraded parts are combined and encoded into a degraded stream, while the designated parts are encoded in designated streams. All streams are precoded and superimposed in a non-orthogonal fashion before being transmitted over the same time-frequency resource. We first derive the optimized RS-based precoder, where the design philosophy is to achieve a fair user group rate for the considered scenario by solving a joint max-min fairness and sum subcarrier rate optimization problem. Comparing with other precoding schemes including the state-of-the-art multicast transmission scheme, we show that the RS precoder outperforms its counterparts in terms of the fairness rate, with Gaussian signalling, i.e., idealistic assumptions. Then we integrate the optimized RS precoder into a practical transceiver design for link-level simulations (LLS), with realistic assumptions such as finite alphabet inputs and finite code block length. The performance metric becomes the coded bit error rate (BER).In the system under study, low-density parity-check (LDPC) encoding is applied at the transmitter, and iterative soft-input soft-output detection and decoding are employed at the successive interference cancellation based receiver, which completes the LLS processing chain and helps to generate the coded error performance results which validate the effectiveness of the proposed RS precoding scheme compared with benchmark schemes, in terms of the error performance. More importantly, we unveil the corresponding relations between the achievable rate in the idealistic case and coded BER in the realistic case, e.g., with finite alphabet input, for the RS precoded multicarrier multigroup multicast scenario.

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“…RSMA enables a more flexible interference management approach of partially decoding the interference and partially treating the interference as noise, and it has been shown to bridge and outperform space division multiple access (SDMA) and power-domain non-orthogonal multiple access (NOMA) [20,[22][23][24][25]. Furthermore, the performance advantage of RSMA has also been demonstrated in terms of robustness against imperfect CSIT [26,27] and user mobility [28], SE [20], EE [29], user fairness [30], reliability [31], QoS enhancements [20], etc.…”

Section: Introductionmentioning

confidence: 99%

Secure Beamforming Design for Rate-Splitting Multiple Access in Multi-antenna Broadcast Channel with Confidential Messages

Xia¹,

Mao²,

Zhou³

et al. 2022

Preprint

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As physical layer security evolves to multi-user systems, multi-user interference (MUI) becomes an unavoidable issue. Recently, rate-splitting multiple access (RSMA) emerges as a powerful non-orthogonal transmission framework and interference management strategy with high spectral efficiency. Unlike most works fully treating MUI as noise, we take all users' secrecy rate requirements into consideration and propose an RSMA-based secure beamforming approach to maximize the weighted sum-rate (WSR), where MUI is partially decoded and partially treated as noise. User messages are split and encoded into common and private streams. Each user not only decodes the common stream and the intended private stream, but also tries to eavesdrop other users' private streams. A successive convex approximation (SCA)-based approach is proposed to maximize the instantaneous WSR under perfect channel state information at the transmitter (CSIT). We then propose a joint weighted minimum mean square error and SCA-based alternating optimization algorithm to maximize the weighted ergodic sum-rate under imperfect CSIT. Numerical results demonstrate RSMA achieves better WSR and is more robust to channel errors than conventional multi-user linear precoding technique while ensuring all users' security requirements. Besides, RSMA can satisfy all users' secrecy rate requirements without introducing WSR loss thanks to its powerful interference management capability.

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Link-Level Performance of Rate-Splitting based Downlink Multiuser MISO Systems

Cited by 13 publications

References 9 publications

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

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

Rate-Splitting for Multicarrier Multigroup Multicast: Precoder Design and Error Performance

Secure Beamforming Design for Rate-Splitting Multiple Access in Multi-antenna Broadcast Channel with Confidential Messages

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