Reconfigurable Intelligent Surface-Assisted Uplink Sparse Code Multiple Access
TLDR
This letter proposes, for the first time, a low-cost design for RIS-assisted uplink SCMA (SCMA-RIS) scheme to improve the conventional SCMA spectrum efficiency and reduce the MPA decoding complexity and improve the bit error rate performance of the conventionalSCMA.Abstract:
Reconfigurable intelligent surface-empowered communication (RIS) and sparse code multiple access (SCMA) are promising candidates for future generations of wireless networks The former enhances the transmission environments, whereas the latter provides a high spectral efficiency transmission This letter proposes, for the first time, a low-cost design for RIS-assisted uplink SCMA (SCMA-RIS) scheme to improve the conventional SCMA spectrum efficiency The message passing algorithm (MPA) is utilized and modified to decode the SCMA-RIS transmitted signals Moreover, a low-complexity decoder for the SCMA-RIS scheme is proposed to significantly reduce the MPA decoding complexity and improve the bit error rate performance of the conventional SCMA Monte Carlo simulations and complexity analysis are presented, which support the findingsread more
Citations
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Journal ArticleDOI
Reconfigurable Intelligent Surfaces for Wireless Communications: Overview of Hardware Designs, Channel Models, and Estimation Techniques
Men Jian,George C. Alexandropoulos,Ertugrul Basar,Chongwen Huang,Ruiqi Liu,Yuanwei Liu,Chau Yuen +6 more
TL;DR: An overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation, which constitute a prerequisite step for the optimized incorporation of RISs in future wireless networks.
Journal ArticleDOI
Reconfigurable intelligent surfaces for wireless communications: Overview of hardware designs, channel models, and estimation techniques
TL;DR: In this article , the authors overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation.
Journal ArticleDOI
Modeling RIS Empowered Outdoor-to-Indoor Communication in mmWave Cellular Networks
TL;DR: In this paper, the authors investigate the practicability of utilizing reconfigurable intelligent surfaces (RISs) for assisting outdoor-to-indoor (O2I) communication.
Journal ArticleDOI
A State-of-the-Art Survey on Reconfigurable Intelligent Surface-Assisted Non-Orthogonal Multiple Access Networks
Zhiguo Ding,Lu Lv,Fang Fang,Octavia A. Dobre,George K. Karagiannidis,Naofal Al-Dhahir,Robert Schober,H. Vincent Poor +7 more
TL;DR: This survey provides a comprehensive overview of the recent progress on the synergistic integration of RISs and NOMA, and introduces the basics of both techniques first, and then the fundamentals of RIS-NOMA are discussed for two communication scenarios with different transceiver capabilities.
Journal ArticleDOI
Sparse Code Multiple Access: Potentials and Challenges
TL;DR: A comprehensive survey of the state-of-the-art of SCMA can be found in this paper, where the authors provide a review of exiting codebook designs and available SCMA detectors.
References
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Wireless Communications Through Reconfigurable Intelligent Surfaces
Ertugrul Basar,Marco Di Renzo,Julien de Rosny,Merouane Debbah,Mohamed-Slim Alouini,Rui Zhang +5 more
TL;DR: In this paper, the authors provide a detailed overview and historical perspective on state-of-the-art solutions, and elaborate on the fundamental differences with other technologies, the most important open research issues to tackle, and the reasons why the use of reconfigurable intelligent surfaces necessitates to rethink the communication-theoretic models currently employed in wireless networks.
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A Survey on Non-Orthogonal Multiple Access for 5G Networks: Research Challenges and Future Trends
Zhiguo Ding,Xianfu Lei,George K. Karagiannidis,Robert Schober,Jinhong Yuan,Vijay K. Bhargava +5 more
TL;DR: In this paper, the authors provide an overview of the latest NOMA research and innovations as well as their applications in 5G wireless networks and discuss future challenges and future research challenges.
Proceedings ArticleDOI
Sparse code multiple access
Hosein Nikopour,Hadi Baligh +1 more
TL;DR: A new multiple access scheme so called sparse code multiple access (SCMA) is proposed which still enjoys the low complexity reception technique but with better performance compared to LDS, allowing us to take advantage of a near optimal ML receiver with practically feasible complexity.
Proceedings ArticleDOI
SCMA Codebook Design
TL;DR: A systematic approach is proposed to design SCMA codebooks mainly based on the design principles of lattice constellations to show the performance gain of SCMA compared to LDS and OFDMA.
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Reconfigurable Intelligent Surfaces for Wireless Communications: Principles, Challenges, and Opportunities
Mohamed A. ElMossallamy,Hongliang Zhang,Lingyang Song,Karim G. Seddik,Zhu Han,Geoffrey Ye Li +5 more
TL;DR: This article describes the working principles of reconfigurable intelligent surfaces (RIS) and elaborate on different candidate implementations using metasurfaces and reflectarrays, and discusses the channel models suitable for both implementations and the feasibility of obtaining accurate channel estimates.