Time-Frequency Domain PTRS Aided OTFS Phase Noise Compensation

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-01-13 DOI:10.1109/LCOMM.2025.3529310

Yu Liang;Xiangjun Li;Pingzhi Fan

引用次数: 0

Abstract

Orthogonal time frequency Space (OTFS) modulation was developed to mitigate the adverse effects of Doppler shifts. However, accurately estimating phase noise within the delay-Doppler (DD) domain remains a formidable challenge. This letter delves into the compensation of carrier phase error (CPE) and its impact on OTFS modulation performance. To achieve this, a time-frequency (TF) domain-aided phase noise estimation scheme is proposed. First, a superimposed pilot scheme is introduced, in which the superimposed phase-tapped reference symbols (PTRS) are employed in the TF domain for estimating the CPE. Subsequently, a method that utilizes pilots in the DD domain to estimate the DD domain channel, and PTRSs in the TF domain to estimate the CPE is proposed. Through an iterative algorithm bridging these domains, the proposed scheme adeptly compensates for CPE in the DD domain. Simulation results demonstrate superior performance in terms of normalized mean squared error (NMSE) and bit error rate (BER), particularly in scenarios involving oscillator phase noise in both 28 GHz and 70 GHz systems.

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时频域 PTRS 辅助 OTFS 相位噪声补偿

正交时频空间（OTFS）调制是为了减轻多普勒频移的不利影响而发展起来的。然而，准确估计延迟多普勒（DD）域的相位噪声仍然是一个艰巨的挑战。本文探讨了载波相位误差（CPE）补偿及其对OTFS调制性能的影响。为此，提出了一种时频域辅助相位噪声估计方法。首先，介绍了一种叠加导频方案，该方案利用叠加相位抽头参考符号（PTRS）在TF域估计CPE；随后，提出了一种利用DD域导频估计DD域信道，利用TF域ptrs估计CPE的方法。通过桥接这些域的迭代算法，该方案巧妙地补偿了DD域的CPE。仿真结果表明，在标准化均方误差（NMSE）和误码率（BER）方面，特别是在涉及28 GHz和70 GHz系统中的振荡器相位噪声的情况下，具有优越的性能。

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.