Low Complexity Iterative Channel Estimation and Detection Based on Pilot-Assisted for ZP-OTFS

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-02-14 DOI:10.1109/LCOMM.2025.3542020

Qiang Guo;Hanyu Jiang;Jianhong Xiang;Yu Zhong

引用次数: 0

Abstract

Orthogonal Time Frequency Space (OTFS) modulation offers a novel solution for high-mobility communication. However, iterative channel estimation and detection methods with high complexity limit the application of OTFS. In this letter, a pilot-assisted low complexity iterative channel estimation and detection approach is presented to tackle this challenge. First, we design a generalized compressed sensing-BEM (GCS-BEM) pilot insertion strategy to reduce inter-symbol interference (ISI) of data symbols and enhance the initial channel estimation performance. Second, a pilot-assisted alternative iterative channel estimation (PAAI-CE) method that combines local and global symbols to accelerate channel updates. Specifically, the pilot constrained confidence region (PCCR) is designed to facilitate the convergence of maximum ratio combining (MRC) detection. Simulation results demonstrate that the proposed approach achieves lower computational complexity while maintaining a satisfactory bit error rate (BER).

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正交时频空间（OTFS）调制为高移动性通信提供了一种新的解决方案。然而，复杂度较高的迭代信道估计和检测方法限制了 OTFS 的应用。在这封信中，我们提出了一种试点辅助的低复杂度迭代信道估计和检测方法来应对这一挑战。首先，我们设计了一种广义压缩传感-BEM（GCS-BEM）先导插入策略，以减少数据符号的符号间干扰（ISI），提高初始信道估计性能。其次，结合局部和全局符号的先导辅助替代迭代信道估计（PAAI-CE）方法可加速信道更新。具体来说，设计了先导约束置信区（PCCR），以促进最大比值结合（MRC）检测的收敛。仿真结果表明，所提出的方法在保持令人满意的误码率 (BER) 的同时，还降低了计算复杂度。

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.