The key idea of non-orthogonal multiple access (NOMA) is to serve multiple users simultaneously at the same time and frequency, which can result in excessive multiple-access interference. As a crucial component of NOMA systems, successive interference cancelation (SIC) is key to combating this multiple-access interference, and is the focus of this letter, where an overview of SIC decoding order selection schemes is provided. In particular, selecting the SIC decoding order based on the users’ channel state information (CSI) and the users’ quality of service (QoS), respectively, is discussed. The limitations of these two approaches are illustrated, and then a recently proposed scheme, termed hybrid SIC, which dynamically adapts the SIC decoding order is presented and shown to achieve a surprising performance improvement that cannot be realized by the conventional SIC decoding order selection schemes individually.

中文翻译：

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揭示 SIC 在 NOMA 系统中的重要性：第一部分 - 最新技术和最新发现（受邀论文）

非正交多址 (NOMA) 的关键思想是在同一时间和频率同时为多个用户提供服务，这会导致过多的多址干扰。作为 NOMA 系统的重要组成部分，连续干扰消除 (SIC) 是对抗这种多址干扰的关键，也是本文的重点，其中提供了 SIC 解码顺序选择方案的概述。特别地，讨论了分别基于用户的信道状态信息（CSI）和用户的服务质量（QoS）来选择SIC解码顺序。说明了这两种方法的局限性，然后是最近提出的方案，称为混合 SIC，