MUSIC Based Multipath Delay Estimation Method in the Fractional Domain for OFDM-LFM

IF 3.2 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Signal Processing Letters Pub Date : 2024-10-07 DOI:10.1109/LSP.2024.3475356

Jiaojiao Liu;Erdi Chen;Nan Sun;Biyun Ma

引用次数: 0

Abstract

This letter proposes a high-resolution multipath time delay estimation (TDE) method for orthogonal frequency division multiplexing linear frequency modulation (OFDM-LFM) signals. Leveraging the expression of OFDM-LFM signals in the fractional domain, where the compressed subcarriers conform to a linear uniform arrangement, the algorithm combines with the multiple signal classification (MUSIC) algorithm for TDE. Simulation results show that regardless of the presence of Doppler effect, OFDM-LFM results in less relative root mean square error (RRMSE) compared to orthogonal frequency division multiplexing (OFDM). Furthermore, the superiority of OFDM-LFM signals is particularly evident at lower signal-to-noise ratios (SNRs). So the proposed algorithm offers promising implications for TDE in mobile scenarios.

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基于 MUSIC 的分数域 OFDM-LFM 多径延迟估计方法

本文提出了一种针对正交频分复用线性频率调制（OFDM-LFM）信号的高分辨率多径时延估计（TDE）方法。利用 OFDM-LFM 信号在分数域中的表达式（其中压缩的子载波符合线性均匀排列），该算法结合多信号分类（MUSIC）算法进行 TDE。仿真结果表明，与正交频分复用（OFDM）相比，无论是否存在多普勒效应，OFDM-LFM 的相对均方根误差（RRMSE）都更小。此外，在信噪比（SNR）较低的情况下，OFDM-LFM 信号的优势尤为明显。因此，所提出的算法为移动场景中的 TDE 提供了广阔的前景。

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 Signal Processing Letters 工程技术-工程：电子与电气

CiteScore

7.40

自引率

12.80%

发文量

339

审稿时长

2.8 months

期刊介绍： The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing. Papers published in the Letters can be presented within one year of their appearance in signal processing conferences such as ICASSP, GlobalSIP and ICIP, and also in several workshop organized by the Signal Processing Society.