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

• DOI: 10.48550/arxiv.2305.17178
• Publication Date: 2023-01-01
• Authors: Sibo Zhang; Bruno Clerckx; David Vargas; Oliver Haffenden; Andrew Murphy
• Keywords: Signal Processing (eess.SP); FOS: Computer and information sciences; Computer Science - Information Theory; Information Theory (cs.IT); FOS: Electrical engineering, electronic engineering, information engineering; Electrical Engineering and Systems Science - Signal Processing

Rate-Splitting Multiple Access (RSMA) has emerged as a novel multiple access technique that enlarges the achievable rate region of Multiple-Input Multiple-Output (MIMO) broadcast channels with linear precoding. In this work, we jointly address three practical but fundamental questions: (1) How to exploit benefit RSMA under finite constellations? (2) What are potential and promising ways implement receivers? (3) Can still retain its superiority in absence successive interference cancellers (SIC)? To these concerns, first propose low-complexity precoder designs taking constellations into account show is better achieved such than those assuming Gaussian signalling. We then consider some receiver can be applied RSMA. notice follow one two principles: SIC: cancelling upper layer signals before decoding lower non-SIC: treating noise when layer. light this, alter design according category. Through link-level simulations, effectiveness proposed verified. More importantly, it possible preserve over Spatial Domain (SDMA), including SDMA advanced receivers, even without SIC at receivers. Those results therefore open door competitive implementable strategies for 6G beyond communications.