一种新的5G NR小区搜索PSS定时同步算法

IF 3.4 3区计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Access Pub Date : 1900-01-01 DOI:10.1109/ACCESS.2020.3048692

Dan Wang, Zhiqiang Mei, Hanqing Zhang, Hebin Li

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引用次数: 8

摘要

在第五代(5G)新无线电(NR)系统中，小区搜索是在用户设备(UE)和基站(BS)之间建立下行同步的第一步。然而，频率偏移和噪声会造成同步性能的巨大损失。针对这一问题，提出了一种抗频偏、抗噪声的主同步信号定时同步算法，包括基于傅立叶变换的改进粗同步算法和基于三重自相关算法的精细同步算法。改进的粗同步算法不仅具有较强的抗频偏性，特别是对于较大的频偏，而且能够得到估计的频偏。与传统同步算法相比，精细同步算法具有更强的抗噪声能力。最后，算法分析和仿真结果表明，改进算法在归一化频偏大于0.8时仍能很好地工作，而传统算法无法正常同步。同时，当信噪比低至- 6dB时，基于所提精细同步算法的定时同步检测精度比传统算法提高了约31.7%。

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A Novel PSS Timing Synchronization Algorithm for Cell Search in 5G NR System

Cell search is the first step to establish downlink synchronization between user equipment (UE) and base station (BS) in the fifth generation (5G) new radio (NR) system. However, frequency offset and noise will cause a massive loss of synchronization performance. To solve this problem, a novel timing synchronization algorithm of primary synchronization signal (PSS) with anti-frequency offset and anti-noise is proposed, which includes the improved coarse synchronization algorithm based on Fourier transform and the fine synchronization algorithm based on the triple auto-correlation algorithm. The improved coarse synchronization algorithm not only has a strong frequency offset resistance, especially for large frequency offset, but also obtains the estimated frequency offset. The fine synchronization algorithm is more resistant to noise than the conventional algorithm. Finally, the algorithm analysis and simulation results show that the improved algorithm can work very well even when the normalized frequency offset increases to greater than 0.8, but the conventional algorithm fails to synchronize properly. Meanwhile, when the SNR is as low as −6dB, the detection accuracy of the timing synchronization based on the proposed fine synchronization algorithm is improved by about 31.7% compared with the conventional algorithm.

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来源期刊

IEEE Access COMPUTER SCIENCE, INFORMATION SYSTEMSENGIN-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

9.80

自引率

7.70%

发文量

6673

审稿时长

6 weeks

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