With the expanding demand for high data rates and extensive coverage, high throughput satellite (HTS) communication systems are emerging as a key technology for future communication generations. However, current frequency bands are increasingly congested. Until the maturity of communication systems to operate on higher bands, the solution is to exploit the already existing frequency bands more efficiently. In this context, precoding emerges as one of the prolific approaches to increasing spectral efficiency. This survey presents an overview and a classification of the recent precoding techniques for HTS communication systems from two main perspectives: 1) a problem formulation perspective and 2) a system design perspective. From a problem formulation point of view, precoding techniques are classified according to the precoding optimization problem, group, and level. From a system design standpoint, precoding is categorized based on the system architecture, the precoding implementation, and the type of the provided service. Further, practical system impairments are discussed, and robust precoding techniques are presented. Finally, future trends in precoding for satellites are addressed to spur further research.

中文翻译：

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高吞吐量卫星通信系统的预编码：调查

随着对高数据速率和广泛覆盖范围的需求不断扩大，高吞吐量卫星（HTS）通信系统正在成为未来通信的关键技术。然而，当前的频段日益拥挤。在更高频段运行的通信系统成熟之前，解决方案是更有效地利用现有频段。在这种背景下，预编码成为提高频谱效率的多产方法之一。本次调查从两个主要角度对 HTS 通信系统的最新预编码技术进行了概述和分类：1）问题表述角度和 2）系统设计角度。从问题表述的角度来看，预编码技术根据预编码优化问题、组和级别进行分类。从系统设计的角度来看，预编码根据系统架构、预编码实现和所提供服务的类型进行分类。此外，讨论了实际的系统损伤，并提出了鲁棒的预编码技术。最后，讨论了卫星预编码的未来趋势，以促进进一步的研究。