论文标题
使用不完美的CSI用于无细胞的MIMO系统的速率分类多重访问的强大设计
Robust Design of Rate-Splitting Multiple Access With Imperfect CSI for Cell-Free MIMO Systems
论文作者
论文摘要
用于多用户下行链路的速率拆分多重访问（RSMA）通过将每个用户设备（UE）的消息分配到私人消息和一组通用消息来运行，这些消息同时通过叠加编码来传输。与常规的多个访问技术相比，RSMA方案可以通过优化速率 - 分类比以及相应的下行链接范围向量来提高吞吐量和连接性。这项工作研究了错误的通道状态信息（CSI）对无单元多输入多输出（MIMO）系统中RSMA性能的影响。通过在预期数据速率上使用封闭形式的下限表达式提出了有效的鲁棒优化算法。广泛的数值结果表明，在存在CSI误差的情况下，健壮设计的重要性以及RSMA的性能对常规方案的增长如何受到CSI缺陷的影响。
Rate-Splitting Multiple Access (RSMA) for multi-user downlink operates by splitting the message for each user equipment (UE) into a private message and a set of common messages, which are simultaneously transmitted by means of superposition coding. The RSMA scheme can enhance throughput and connectivity as compared to conventional multiple access techniques by optimizing the rate-splitting ratios along with the corresponding downlink beamforming vectors. This work examines the impact of erroneous channel state information (CSI) on the performance of RSMA in cell-free multiple-input multiple-output (MIMO) systems. An efficient robust optimization algorithm is proposed by using closed-form lower bound expressions on the expected data rates. Extensive numerical results show the importance of robust design in the presence of CSI errors and how the performance gain of RSMA over conventional schemes is affected by CSI imperfection.
