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Rate-Splitting Multiple Access for Multigroup Multicast and Multibeam Satellite Systems

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Document pages: 15 pages

Abstract: This work focuses on the promising Rate-Splitting Multiple Access (RSMA) andits beamforming design problem to achieve max-min fairness (MMF) among multipleco-channel multicast groups with imperfect channel state information at thetransmitter (CSIT). Contrary to the conventional linear precoding (NoRS) thatrelies on fully treating any residual interference as noise, we consider anovel multigroup multicast beamforming strategy based on RSMA. RSMA relies onlinearly precoded Rate-Splitting (RS) at the transmitter and SuccessiveInterference Cancellation (SIC) at the receivers, and has recently been shownto enable a flexible framework for non-orthogonal transmission and robustinterference management in multi-antenna wireless networks. In this work, wecharacterize the MMF Degrees-of-Freedom (DoF) achieved by RS and NoRS inmultigroup multicast with imperfect CSIT and demonstrate the benefits of RSstrategies for both underloaded and overloaded scenarios. Motivated by the DoFanalysis, we then formulate a generic transmit power constrained optimizationproblem to achieve MMF rate performance. The superiority of RS-based multigroupmulticast beamforming compared with NoRS is demonstrated via simulations inboth terrestrial and multibeam satellite systems. In particular, due to thecharacteristics and challenges of multibeam satellite communications, ourproposed RS strategy is shown promising to manage its interbeam interference.

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