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Rate-Splitting Multiple Access (RSMA) has emerged as a novel multiple accesstechnique that enlarges the achievable rate region of Multiple-InputMultiple-Output (MIMO) broadcast channels with linear precoding. In this work,we jointly address three practical but fundamental questions: (1) How toexploit the benefit of RSMA under finite constellations? (2) What are thepotential and promising ways to implement RSMA receivers? (3) Can RSMA stillretain its superiority in the absence of successive interference cancellers(SIC)? To address these concerns, we first propose low-complexity precoderdesigns taking finite constellations into account and show that the potentialof RSMA is better achieved with such designs than those assuming Gaussiansignalling. We then consider some practical receiver designs that can beapplied to RSMA. We notice that these receiver designs follow one of twoprinciples: (1) SIC: cancelling upper layer signals before decoding the lowerlayer and (2) non-SIC: treating upper layer signals as noise when decoding thelower layer. In light of this, we propose to alter the precoder designaccording to the receiver category. Through link-level simulations, theeffectiveness of the proposed precoder and receiver designs are verified. Moreimportantly, we show that it is possible to preserve the superiority of RSMAover Spatial Domain Multiple Access (SDMA), including SDMA with advancedreceivers, even without SIC at the receivers. Those results therefore open thedoor to competitive implementable RSMA strategies for 6G and beyondcommunications.

Rate-Splitting Multiple Access: Finite Constellations, Receiver Design, and SIC-free Implementation