This brief deals with self-interference (SI) effects in mobile communication radio frequency (RF) transceivers. The basics of current communication standards, namely Long-Term Evolution (LTE) and 5G, are outlined with a focus on carrier aggregation (CA). RF transceivers that support frequency-division duplex (FDD) and CA variants operate multiple receivers and transmitters simultaneously. We illustrate the resulting SI problems, present suitable models for different SI categories and discuss the associated interference estimation tasks. Moreover, we explain the basic architecture of two common countermeasures: digital and mixed-signal SI cancellation.

中文翻译：

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移动LTE-A / 5G FDD收发器中自干扰消除的调查

本简介涉及移动通信射频（RF）收发器中的自干扰（SI）效应。概述了当前通信标准的基础，即长期演进（LTE）和5G，重点是载波聚合（CA）。支持频分双工（FDD）和CA变体的RF收发器可同时运行多个接收器和发射器。我们将说明由此产生的SI问题，为不同的SI类别提供合适的模型，并讨论相关的干扰估计任务。此外，我们解释了两种常见对策的基本架构：数字和混合信号SI消除。