论文标题
汇率分类多播多播和多光束卫星系统的多重访问
Rate-Splitting Multiple Access for Multigroup Multicast and Multibeam Satellite Systems
论文作者
论文摘要
这项工作着重于有希望的速率拆分多重访问（RSMA）及其波束成形设计问题，以在多个共同通道多播组中达到最大值公平性（MMF），该组在发射机（CSIT）上具有不完善的通道状态信息。与传统的线性预编码（NOR）相反，依赖于将任何残留干扰视为噪声，我们考虑了基于RSMA的新型多群多播策略。 RSMA依赖于在接收器处的发射器和连续的干扰取消（SIC）处线性预编码的速率分解（RS），并且最近已证明可以在多 - Antenna无线网络中实现非正交传输和可靠的干扰管理的灵活框架。在这项工作中，我们表征了MMF自由度（DOF）由RS和NORS在多群多播和不完美的CSIT中实现的，并证明了RS策略的好处，包括未载荷和超载方案。在DOF分析的激励下，我们制定了一个通用的传输功率约束优化问题，以实现MMF速率性能。与NORS相比，基于RS的多群多播的优势通过陆地和多束卫星系统中的模拟证明。特别是，由于多层卫星通信的特征和挑战，我们提出的RS策略被证明有望管理其叶间干扰。
This work focuses on the promising Rate-Splitting Multiple Access (RSMA) and its beamforming design problem to achieve max-min fairness (MMF) among multiple co-channel multicast groups with imperfect channel state information at the transmitter (CSIT). Contrary to the conventional linear precoding (NoRS) that relies on fully treating any residual interference as noise, we consider a novel multigroup multicast beamforming strategy based on RSMA. RSMA relies on linearly precoded Rate-Splitting (RS) at the transmitter and Successive Interference Cancellation (SIC) at the receivers, and has recently been shown to enable a flexible framework for non-orthogonal transmission and robust interference management in multi-antenna wireless networks. In this work, we characterize the MMF Degrees-of-Freedom (DoF) achieved by RS and NoRS in multigroup multicast with imperfect CSIT and demonstrate the benefits of RS strategies for both underloaded and overloaded scenarios. Motivated by the DoF analysis, we then formulate a generic transmit power constrained optimization problem to achieve MMF rate performance. The superiority of RS-based multigroup multicast beamforming compared with NoRS is demonstrated via simulations in both terrestrial and multibeam satellite systems. In particular, due to the characteristics and challenges of multibeam satellite communications, our proposed RS strategy is shown promising to manage its interbeam interference.
