Rate-splitting multiple access (RSMA) is a multiple access technique generalizing conventional techniques, such as, space-division multiple access (SDMA), non-orthogonal multiple access (NOMA), and physical layer multi-casting, which aims to address multi-user interference (MUI) in multiple-input multiple-output (MIMO) systems. In this study, we leverage the interference management capabilities of RSMA to tackle the issue of inter-carrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) waveform. We formulate a problem to find the optimal subcarrier and power allocation for downlink transmission in a two-user system using RSMA and OFDM and propose a weighted minimum mean-square error (WMMSE)-based algorithm to obtain a solution. The sum-rate performance of the proposed OFDM-RSMA scheme is compared with that of conventional orthogonal frequency division multiple access (OFDMA) and OFDM-NOMA by numerical results. It is shown that the proposed OFDM-RSMA outperforms OFDM-NOMA and OFDMA under ICI in diverse propagation channel conditions owing to its flexible structure and robust interference management capabilities.

翻译：速率分割多址接入（RSMA）是一种泛化传统多址技术（如空分多址SDMA、非正交多址NOMA和物理层多播）的多址接入方案，旨在解决多输入多输出（MIMO）系统中的多用户干扰（MUI）问题。本研究利用RSMA的干扰管理能力，应对正交频分复用（OFDM）波形中的子载波间干扰（ICI）。我们针对采用RSMA和OFDM的双用户下行链路系统，提出最优子载波与功率分配问题，并设计了一种基于加权最小均方误差（WMMSE）的算法来求解。通过数值结果，将所提OFDM-RSMA方案的总速率性能与传统正交频分多址（OFDMA）及OFDM-NOMA方案进行对比。研究表明，得益于其灵活的结构和鲁棒的干扰管理能力，所提OFDM-RSMA在不同传播信道条件下的ICI环境中，性能均优于OFDM-NOMA和OFDMA。