Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends
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by
Yijie Mao, Onur Dizdar, Bruno Clerckx, Robert Schober, Petar Popovski, H. Vincent Poor
2022
Abstract
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. 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 overview on RSMA by providing a
survey of the pertinent state-of-the-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 RSMA-aided wireless communication for
beyond 5G systems.
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