存在馈线干扰的多网关多波束卫星系统的速率分割多址接入
Rate-Splitting Multiple Access for Multigateway Multibeam Satellite Systems with Feeder Link Interference
摘要：
研究了在存在馈线干扰的多网关多波束卫星通信系统中，实现用户间最大最小公平性的预编码器设计问题。我们提出了一个波束成形策略的基础上，新推出的传输方案称为速率分裂多址接入（RSMA）。RSMA依赖于发射机处的多天线速率分割和接收机处的连续干扰消除（SIC），使得针对用户的预期消息被分成公共部分和专用部分，并且干扰被部分解码并部分被视为噪声。在本文中，我们制定的MMF问题的每个天线的功率限制在卫星上的系统与不完善的信道状态信息在发射机（CSIT）。我们还考虑的情况下，两阶段的预编码，这是协助板上处理（OBP）在卫星上。通过仿真得到的数值结果RSMA和传统的线性预编码方法进行了比较。当使用RSMA时，保证了MMF速率增益，并且当使用OBP时，该增益增加。RSMA被证明是有前途的多网关多波束卫星系统，其中有各种实际的挑战，如馈线链路干扰，CSIT的不确定性，每个天线的功率约束，不均匀的用户分布每个波束和基于帧的处理。
英文摘要：
This paper studies the precoder design problem of achieving max-min fairness (MMF) amongst users in multigateway multibeam satellite communication systems with feeder link interference. We propose a beamforming strategy based on a newly introduced transmission scheme known as rate-splitting multiple access (RSMA). RSMA relies on multi-antenna rate-splitting at the transmitter and successive interference cancellation (SIC) at the receivers, such that the intended message for a user is split into a common part and a private part and the interference is partially decoded and partially treated as noise. In this paper, we formulate the MMF problem subject to per-antenna power constraints at the satellite for the system with imperfect channel state information at the transmitter (CSIT). We also consider the case of two-stage precoding which is assisted by on-board processing (OBP) at the satellite. Numerical results obtained through simulations for RSMA and the conventional linear precoding method are compared. When RSMA is used, MMF rate gain is promised and this gain increases when OBP is used. RSMA is proven to be promising for multigateway multibeam satellite systems whereby there are various practical challenges such as feeder link interference, CSIT uncertainty, per-antenna power constraints, uneven user distribution per beam and frame-based processing.
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