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Rate-Splitting Multiple Access A New Frontier for the PHY Layer of 6G

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Document pages: 7 pages

Abstract: In order to efficiently cope with the high throughput, reliability,heterogeneity of Quality-of-Service (QoS), and massive connectivityrequirements of future 6G multi-antenna wireless networks, multiple access andmultiuser communication system design need to depart from conventionalinterference management strategies, namely fully treat interference as noise(as commonly used in 4G 5G, MU-MIMO, CoMP, Massive MIMO, millimetre wave MIMO)and fully decode interference (as in Non-Orthogonal Multiple Access, NOMA).This paper is dedicated to the theory and applications of a more general andpowerful transmission framework based on Rate-Splitting Multiple Access (RSMA)that splits messages into common and private parts and enables to partiallydecode interference and treat remaining part of the interference as noise. Thisenables RSMA to softly bridge and therefore reconcile the two extremestrategies of fully decode interference and treat interference as noise andprovide room for spectral efficiency, energy efficiency and QoS enhancements,robustness to imperfect Channel State Information at the Transmitter (CSIT),and complexity reduction. We give an overview of RSMA and its potential toaddress the requirements of 6G. This paper provides an overview of RSMA and itspotential to address the requirements of 6G.

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