Iterative Detection for Orthogonal Time Frequency Space Modulation With ADMM

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-03-10 DOI:10.1109/LCOMM.2025.3549525

Xuefeng Li;Chengzhao Shan;Honglin Zhao;Weijie Yuan;Ruoyu Zhang

引用次数: 0

Abstract

Orthogonal time frequency space (OTFS) modulation, because of its excellent performance in fast time-varying channels, has been proposed as an alternative to orthogonal frequency-division multiplexing modulation in high-mobility scenarios. Time and frequency diversity can be fully exploited in OTFS systems with proper signal detection. However, most existing signal detection algorithms are based on message passing (MP) algorithms, and their signal detection performance rapidly deteriorates when the channel has low sparsity. In this letter, we first model the OTFS signal detection problem as an optimization problem and propose an alternating direction method of multipliers (ADMM)-based algorithm to solve the problem. On this basis, we further propose a modified ADMM-based algorithm by replacing the penalty term to address the performance loss caused by constraint relaxation. The numerical results show that the proposed algorithms are effective in terms of convergence and detection performance.

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ADMM正交时频空间调制的迭代检测

正交时频空间（OTFS）调制由于其在快速时变信道中的优异性能，已被提出作为高迁移率场景下正交频分复用调制的替代方案。通过适当的信号检测，可以充分利用OTFS系统的时频分集特性。然而，现有的信号检测算法大多基于消息传递（message passing， MP）算法，当信道稀疏度较低时，其信号检测性能会迅速下降。在本文中，我们首先将OTFS信号检测问题建模为优化问题，并提出了一种基于乘法器交替方向法（ADMM）的算法来解决该问题。在此基础上，我们进一步提出了一种改进的基于admm的算法，通过替换惩罚项来解决约束松弛带来的性能损失。数值结果表明，该算法在收敛性和检测性能方面都是有效的。

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.