Full-Duplex Cooperative Rate Splitting Multiple Access with Imperfect CSI and Imperfect SIC

Rate splitting multiple access (RSMA) is one of the promising multiple access techniques in 6G. One of the limitations of RSMA is that the rate is limited by the worst user’s rate. Cooperative rate splitting multiple access (C-RSMA) has become an essential technique to overcome this limitation. In this work, a downlink full-duplex C-RSMA with imperfect channel state information (ICSI) and imperfect successive interference cancellation (ISIC) is considered. Full-duplex (FD) relaying is used to fully utilize the channel in order to enhance the system performance. The objective is to maximize the minimum rate of the users, while ensuring that the transmission latency for each user’s rate does not exceed a specified threshold. Success convex approximation (SCA) is used to optimize the precoding matrix, common rate allocation, and the relay power. Numerical results show that the proposed system improves the Max-Min rate compared to the other systems.