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Rate-splitting multiple access (RSMA) has been recognized as a promising andpowerful multiple access (MA) scheme, non-orthogonal transmission framework andinterference management strategy for 6G. Inspired by the appealing spectralefficiency gain achieved by RSMA over conventional MA schemes in multi-usermulti-antenna transmission, in this paper we introduce RSMA to reconfigurableintelligent surface (RIS)-aided multiple-input single-out (MISO) broadcastchannel (BC). To further enhance the spectral efficiency, a more generalizedRIS architecture called fully connected RIS is considered. By jointlyoptimizing the scattering matrix of the fully connected RIS and the transmitbeamformers to maximize the sum-rate, we show that the proposed fully connectedRIS aided RSMA transmission scheme significantly improves the spectralefficiency compared with the conventional single connected RIS schemes and theschemes without RIS. It acts as a new benchmark for linearly precodedmulti-user multi-antenna networks.

Fully Connected Reconfigurable Intelligent Surface Aided Rate-Splitting Multiple Access for Multi-User Multi-Antenna Transmission