GNSS-Independent Uplink LEO Satellite Synchronization

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-04-07 DOI:10.1109/LCOMM.2025.3558531

Fredrik Berggren;Branislav M. Popović

引用次数: 0

Abstract

In a nonterrestrial network (NTN) with low earth orbit (LEO) satellites, there could be substantial Doppler shifts due to the relative movement between the satellites and the user equipment (UE). If the UE does not have global navigation satellite system (GNSS) capability, pre-compensation of the Doppler shifts cannot be made. Thus, synchronization signals are required which could be detected subject to large frequency offsets. We propose superposed pairs of interleaved Zadoff-Chu (SPI-ZC) synchronization sequences, each ZC sequence being interleaved by a linear permutation polynomial (LPP). The LPP renders a large set of sequences and sequences with improved peak-to-sidelobe-ratio (PSR) in the periodic correlation function, which improves the probability of correct synchronization. Lower detection complexity can be achieved compared to prior synchronization methods.

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与gnss无关的LEO卫星上行同步

在具有低地球轨道卫星的非地面网络（NTN）中，由于卫星和用户设备（UE）之间的相对运动，可能存在大量的多普勒频移。如果UE不具备全球导航卫星系统（GNSS）能力，则无法对多普勒频移进行预补偿。因此，需要同步信号，该信号可以在较大的频率偏移下检测到。我们提出了重叠对交错Zadoff-Chu （SPI-ZC）同步序列，每个ZC序列由一个线性置换多项式（LPP）交错。LPP呈现了大量序列和周期相关函数中提高了峰旁比（PSR）的序列，提高了正确同步的概率。与先前的同步方法相比，可以实现更低的检测复杂度。

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.