Rate-splitting multiple access (RSMA) has been recognized as a promising and powerful multiple access (MA) scheme, non-orthogonal transmission framework and interference management strategy for 6G. Inspired by the appealing spectral efficiency gain achieved by RSMA over conventional MA schemes in multi-user multi-antenna transmission, in this paper we introduce RSMA to reconfigurable intelligent surface (RIS)-aided multiple-input single-out (MISO) broadcast channel (BC). To further enhance the spectral efficiency, a more generalized RIS architecture called fully connected RIS is considered. By jointly optimizing the scattering matrix of the fully connected RIS and the transmit beamformers to maximize the sum-rate, we show that the proposed fully connected RIS aided RSMA transmission scheme significantly improves the spectral efficiency compared with the conventional single connected RIS schemes and the schemes without RIS. It acts as a new benchmark for linearly precoded multi-user multi-antenna networks.
翻译:分率多重接入(RSMA)被公认为是6G的有希望和强大的多重接入(MA)计划、非横向传输框架和干扰管理战略。 受RSMA在多用户多保险传输的常规MA计划方面所取得的吸引性光谱效率增益的启发,在本文件中,我们引入RSMA,以重新配置智能表面(RIS)辅助的多投入单输(MISO)广播频道(BC)。为了进一步提高光谱效率,考虑建立一个称为完全连通的RIS的更为普遍的RIS结构。通过联合优化完全连通的RIS和传输光谱仪的分布矩阵,以最大限度地实现总率,我们表明拟议的完全连通的RIS援助RSMA传输计划与常规单一连接的RIS计划和没有RIS的系统相比,大大提高了光谱效率。它作为线性预先编码多用户多保险网的新基准。