Next-generation satellite systems targeting multi-Terabit-per-second throughput require surmounting layers of design challenges. For feeder links, extremely high frequency (EHF) band is desired to overcome spectrum limitations and reduce equipment size. Multiple gateways are utilized to aggregate their bandwidths and serve as site diversity, mitigating the increased susceptibility of the EHF band to atmospheric attenuation. Toward this, multiple-input multiple-output (MIMO) technology is well suited for feeder links that share the same time, frequency, and polarization resources. This paper provides novel extension of MIMO-enabled feeder links when clustering more than two gateways and mounting more than two antennas onboard geostationary multibeam satellite, exploiting line-of-sight MIMO on uplinks and downlinks. Arsenal of countermeasures against inter-antenna interference and weather impairments is designed to maximize gains in signal-to-noise ratio, spatial multiplexing, and spatial diversity. Comparisons between offered sum rates and theoretical MIMO capacity are provided when gateway clusters form linear versus circular patterns. Methodology for gateway diversity is developed and analyzed when deploying redundant MIMO feeder links that handle rerouted traffic. Algorithms for ground-based channel state information (CSI) acquisition are designed and implemented in receiver architecture that tackles strong practical impairments. Numerical studies reveal that MIMO-enabled feeder links offer greatly enhanced overall network availability compared with state-of-the-art single-input single-output (SISO) solutions.

中文翻译：

---

多波束卫星系统中的高容量、耐候性 MIMO 馈线链路

以每秒多太比特吞吐量为目标的下一代卫星系统需要克服层层设计挑战。对于馈线链路，需要超高频 (EHF) 频段来克服频谱限制并减小设备尺寸。多个网关用于聚合其带宽并用作站点分集，从而减轻 EHF 频段对大气衰减的敏感性增加。为此，多输入多输出 (MIMO) 技术非常适合共享相同时间、频率和极化资源的馈线链路。当集群超过两个网关并在地球同步多波束卫星上安装两个以上天线时，本文提供了支持 MIMO 的馈线链路的新扩展，利用上行链路和下行链路上的视线 MIMO。针对天线间干扰和天气损伤的对策库旨在最大限度地提高信噪比、空间复用和空间分集。当网关集群形成线性与圆形模式时，提供了所提供的总速率和理论 MIMO 容量之间的比较。在部署处理重新路由流量的冗余 MIMO 馈线链路时，开发和分析了网关分集方法。基于地面的信道状态信息 (CSI) 采集算法在接收器架构中设计和实现，以解决强大的实际损伤。数值研究表明，与最先进的单输入单输出 (SISO) 解决方案相比，支持 MIMO 的馈线链路可大大提高整体网络可用性。