Efficient Signal Demodulation Based on Multistage Interference Separation for MIMO-OTFS

IF 4.4 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-04-17 DOI:10.1109/LCOMM.2025.3562012

Zhiyong Luo;Honghao Shi;Beibei Zhu

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引用次数: 0

Abstract

In typical communication scenarios with numerous scatters, the Multiple-Input Multiple-Output (MIMO) Orthogonal Time Frequency Space (OTFS) system encounters various dimensional interference, such as inter-Doppler interference (IDI), inter-antenna interference (IAI), and inter-symbol interference (ISI). These interference present significant challenges to effective signal demodulation at the receiver. To address these challenges, we propose an iterative symbol detector (ISD) based on multistage interference separation in the time-space (TS) domain, leveraging its inherent sparsity. Specifically, we integrate an equalizer before the ISD to provide initial estimates and mitigate IDI. In each iteration, the ISD reconstructs and cancels IAI and ISI, then applies the Gauss-Seidel (GS) iteration method to solve the TS domain equations following interference cancellation. Simulation results demonstrate the effectiveness of the proposed ISD, showing its ability to significantly reduce interference in the MIMO-OTFS system. It outperforms benchmark algorithm in 4-QAM and 16-QAM and enhanced demodulation performance.

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基于多级干扰分离的MIMO-OTFS高效信号解调

在典型的多散射通信场景中，MIMO正交时频空间（OTFS）系统会遇到各种维度干扰，如多普勒间干扰（IDI）、天线间干扰（IAI）和符号间干扰（ISI）。这些干扰对接收机的有效信号解调提出了重大挑战。为了解决这些挑战，我们提出了一种基于多阶段干扰分离的迭代符号检测器（ISD），利用其固有的稀疏性。具体来说，我们在ISD之前集成了一个均衡器，以提供初步估计并减轻IDI。在每次迭代中，ISD重建并消除IAI和ISI，然后应用高斯-塞德尔（GS）迭代法求解干扰消除后的TS域方程。仿真结果证明了所提出的ISD的有效性，表明其能够显著降低MIMO-OTFS系统中的干扰。它在4-QAM和16-QAM方面优于基准算法，并增强了解调性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.