A fine synchronization method for coherent fast frequency hopping

IF 3.1 3区 计算机科学 Q2 TELECOMMUNICATIONS China Communications Pub Date : 2023-10-01 DOI:10.23919/jcc.fa.2022-0599.202310
Xuanhe Yang, Weike Zhang, Shixun Luo, Chang Li, Xiaqing Miao, Aihua Wang
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Abstract

Coherent fast frequency hopping (CFFH) is attracting growing attention owing to its good antijamming performance and the coherent combining ability. However, compared with the conventional non-coherent fast frequency hopping, CFFH requires a more precise system synchronization. In this paper, we propose a new fine synchronization algorithm for CFFH. This algorithm consists two stages, namely, open-loop stage and closed-loop stage. In the open-loop stage, a grid-based search parameter estimation method is proposed. In the closed-loop stage, we construct a fully coherent phase-locked loop (PLL) and a delay-locked loop (DLL) with decoding feedback structure to perform further fine estimation of the system clock skew and time delay, respectively. Moreover, we analyze the effect of the search parameter settings on the estimation error and derive the root mean squared error (RMSE) of estimates in the steady state of the closed-loop stage. Finally, through simulation, the RMSE performance are compared with the corresponding Cramer-Rao low bound (CRLB) and conventional code loop estimation to show the effectiveness of proposed algorithm.
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相干快速跳频的精细同步方法
相干快速跳频(CFFH)以其良好的抗干扰性能和相干组合能力受到越来越多的关注。然而,与传统的非相干快速跳频相比,CFFH对系统同步精度要求更高。本文提出了一种新的CFFH精细同步算法。该算法分为两个阶段,即开环阶段和闭环阶段。在开环阶段,提出一种基于网格的搜索参数估计方法。在闭环阶段,我们构建了一个全相干锁相环(PLL)和一个具有译码反馈结构的锁相环(DLL),分别对系统的时钟偏差和时延进行了进一步的精细估计。此外,我们分析了搜索参数设置对估计误差的影响,并推导了闭环阶段稳态估计的均方根误差(RMSE)。最后,通过仿真,将RMSE性能与相应的Cramer-Rao下界(CRLB)和常规码环估计进行了比较,验证了所提算法的有效性。
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
China Communications
China Communications 工程技术-电信学
CiteScore
8.00
自引率
12.20%
发文量
2868
审稿时长
8.6 months
期刊介绍: China Communications (ISSN 1673-5447) is an English-language monthly journal cosponsored by the China Institute of Communications (CIC) and IEEE Communications Society (IEEE ComSoc). It is aimed at readers in industry, universities, research and development organizations, and government agencies in the field of Information and Communications Technologies (ICTs) worldwide. The journal's main objective is to promote academic exchange in the ICTs sector and publish high-quality papers to contribute to the global ICTs industry. It provides instant access to the latest articles and papers, presenting leading-edge research achievements, tutorial overviews, and descriptions of significant practical applications of technology. China Communications has been indexed in SCIE (Science Citation Index-Expanded) since January 2007. Additionally, all articles have been available in the IEEE Xplore digital library since January 2013.
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