This paper presents an alternative approach to real-valued signal representation and proposes an improved successive interference cancellation (SIC)-based detection scheme using the alternative signal representation for non-uniform constellations (NUCs) in Advanced Television Systems Committee (ATSC) 3.0. Since I/Q polarization interleaving in ATSC 3.0 multiple-input multiple-output (MIMO) precoding performs a non-linear operation, it makes it difficult to use conventional suboptimal detection schemes based on interference cancellation. Therefore, the alternative signal representation is designed to easily apply various suboptimal detection schemes. Further, to obtain more robustness and lower complexity, a suboptimal detection scheme based on the alternative signal representation and interference cancellation with QR decomposition is proposed. The proposed detection scheme exploits the structural properties of NUCs and jointly detects the real and imaginary parts as a block. In addition, by considering one or more candidate symbols in the interference cancellation for the proposed detection scheme, the performance and the complexity are trade-offs according to the number of the considering candidate symbols. Simulation results show that the proposed detection scheme with a slight increase of the complexity significantly outperforms a linear detection under fixed and mobile channels.

中文翻译：

---

一种改进的基于 SIC 的 ATSC 3.0 MIMO 中非均匀星座检测方案

本文提出了一种实值信号表示的替代方法，并提出了一种改进的基于连续干扰消除 (SIC) 的检测方案，该方案使用高级电视系统委员会 (ATSC) 3.0 中非均匀星座 (NUC) 的替代信号表示。由于 ATSC 3.0 多输入多输出 (MIMO) 预编码中的 I/Q 极化交织执行非线性操作，因此难以使用基于干扰消除的传统次优检测方案。因此，替代信号表示旨在轻松应用各种次优检测方案。此外，为了获得更高的鲁棒性和更低的复杂性，提出了一种基于替代信号表示和具有QR分解的干扰消除的次优检测方案。所提出的检测方案利用 NUC 的结构特性，将实部和虚部联合检测为一个块。此外，通过在所提出的检测方案的干扰消除中考虑一个或多个候选符号，性能和复杂度是根据考虑的候选符号的数量进行权衡的。仿真结果表明，所提出的检测方案在复杂度略有增加的情况下明显优于固定和移动信道下的线性检测。性能和复杂性是根据考虑的候选符号的数量进行权衡的。仿真结果表明，所提出的检测方案在复杂度略有增加的情况下明显优于固定和移动信道下的线性检测。性能和复杂性是根据考虑的候选符号的数量进行权衡的。仿真结果表明，所提出的检测方案在复杂度略有增加的情况下明显优于固定和移动信道下的线性检测。