Reconfigurable Intelligent Surfaces Empowered Cooperative Rate Splitting with User Relaying

Zhao, Kangchun; Mao, Yijie; Yang, Zhaohui; Lian, Lixiang; Clerckx, Bruno

doi:10.1109/iswcs56560.2022.9940359

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…where the penalty method [14] for the phase shift constraints ( 10) is adopted and C is a large positive constant. Similar to ( 14), ( 16) can be approximated by calculating the firstorder Taylor approximation of (16) on v around the point (ṽ, q), denoted by ( 16).…”

Section: B Phase Shift Designmentioning

confidence: 99%

“…In this section, we outline an alternating optimization procedure, that is suitable to be utilized for resilience applications. Usually, when considering an SCA approach in the literature, the goal is to retrieve the highest-quality solution for a given problem [8,9,14]. Hence, these works do not take the duration of obtaining these solutions into consideration and employ time-intensive outer and inner loops, until some convergence criteria are met.…”

Section: Resilience-aware Alternating Optimizationmentioning

confidence: 99%

“…14 antennas. We assume the K = 14 single-antenna users, as well as the APs, to be distributed randomly within an area of operation, which spans [−250, 250] × [−250, 250]m 2 .…”

mentioning

confidence: 99%

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RIS-enhanced Resilience in Cell-Free MIMO

Weinberger¹,

Reifert²,

Sezgin³

et al. 2022

Preprint

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More and more applications that require high reliability and fault tolerance are realized with wireless network architectures and thus ultimately rely on the wireless channels, which can be subject to impairments and blockages. Hence, these architectures require a backup plan in the physical layer in order to guarantee functionality, especially when safetyrelevant aspects are involved. To this end, this work proposes to utilize the reconfigurable intelligent surface (RIS) as a resilience mechanism to counteract outages. The advantages of RISs for such a purpose derive from their inherent addition of alternative channel links in combination with their reconfigurability. The major benefits are investigated in a cell-free multiple-input and multiple-output (MIMO) setting, in which the direct channel paths are subject to blockages. An optimization problem is formulated that includes rate allocation with beamforming and phase shift configuration and is solved with a resilience-aware alternating optimization approach. Numerical results show that deploying even a randomly-configured RIS to a network reduces the performance degradation caused by blockages. This becomes even more pronounced in the optimized case, in which the RIS is able to potentially counteract the performance degradation entirely. Interestingly, adding more reflecting elements to the system brings an overall benefit for the resilience, even for timesensitive systems, due to the contribution of the RIS reflections, even when unoptimized.

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Section: B Phase Shift Designmentioning

confidence: 99%

Section: Resilience-aware Alternating Optimizationmentioning

confidence: 99%

See 1 more Smart Citation

RIS-enhanced Resilience in Cell-Free MIMO

Weinberger¹,

Reifert²,

Sezgin³

et al. 2022

Preprint

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Rate splitting with semantics as a generalized multi-access framework for intelligent reflecting surfaces

Jagatheesaperumal,

Yang,

Hassan

et al. 2024

Sci Rep

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The rapid advancement of modern communication technologies necessitates the development of generalized multi-access frameworks and the continuous implementation of rate splitting, augmented with semantic awareness. This trend, coupled with the mounting pressure on wireless services, underscores the need for intelligent approaches to radio signal propagation. In response to these challenges, intelligent reflecting surfaces (IRS) have garnered significant attention for their ability to control data transmission systems in a goal-oriented and dynamic manner. This innovation is largely attributed to equitable resource allocation and the dynamic enhancement of network performance. However, the integration of rate-splitting multi-access (RSMA) architecture with semantic considerations imposes stringent requirements on IRS platforms to ensure seamless connectivity and broad coverage for a diverse user base without interference. Semantic communications hinge on a knowledge base-a centralized repository of integrated information related to the transmitted data-which becomes critically important in multi-antenna scenarios. This article proposes a novel set of design strategies for RSMA-IRS systems, enabled by reconfigurable intelligent surface synergizing with semantic communication principles. An experimental analysis is presented, demonstrating the effectiveness of these design guidelines in the context of Beyond 5G/6G communication systems. The RSMA-IRS model, infused with semantic communication, offers a promising solution for future wireless networks. Performance evaluations of the proposed approach reveal that, despite an increase in the number of users, the delay in the RSMA-IRS framework incorporating semantics is 2.94% less than that of a RSMA-IRS system without semantic integration.

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