This paper considers the pre-processing design to mitigate the multibeam interference in the downlink of a high-throughput satellite, with a common precoder for several users sharing the same frame, and limited adaptation capabilities on-board the satellite. Beams are grouped in clusters managed by different non-cooperative gateways. A two-level approach is performed, with an on-board beamforming network complemented by on-ground precoders. The former, designed with the SLNR (signal-to-leakage and noise ratio) criterion, mitigates the inter-cluster interference, whereas the latter fight the intra-cluster multiuser co-channel interference. Judicious user scheduling is also addressed to limit the impact of the multicasting and limited adaptation capabilities. Several two-level precoding designs can be obtained by setting accordingly the degree of cooperation and the frame adaptation, with an overall satisfactory performance with respect to the single-gateway benchmark. In particular, a sector-based solution with non-cooperative gateways presents a good trade-off between gateway autonomy and performance.

本文考虑了为减轻高吞吐量卫星下行链路中的多波束干扰而进行的预处理设计，为几个共享同一帧的用户使用通用的预编码器，以及卫星上的自适应能力有限。梁被分组在由不同的非合作网关管理的集群中。使用车载波束成形网络和地面预编码器进行补充，执行两级方法。前者采用SLNR（信噪比和信噪比）标准进行设计，可以减轻集群间干扰，而后者则可以对抗集群内多用户同信道干扰。还解决了明智的用户调度问题，以限制多播的影响和有限的适应能力。通过相应地设置协作程度和帧适应度，可以获得几种两级预编码设计，相对于单网关基准而言，总体性能令人满意。尤其是，具有非协作网关的基于扇区的解决方案在网关自治性和性能之间实现了很好的折衷。