Newton‒Raphson算法的低复杂度编码辅助载波同步研究
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航天恒星科技有限公司,北京 100095

作者简介:

王金杰(2001-),男,在读硕士研究生,主要研究方向为数据链通信算法.emial:elias010530@163.com.
张少甫(1984-),男,硕士,研究员,主要研究方向为测控通信技术.
李婷婷(1989-),女,硕士,高级工程师,主要研究方向为数据链通信算法.
刘雨桐(1996-),女,硕士,工程师,主要研究方向为数据链通信算法.

通讯作者:

张少甫(1984-),男,硕士,研究员,主要研究方向为测控通信技术. email:shaofuzhang@126.com

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Research on low-complexity coded-assisted carrier synchronization based on Newton‒Raphson algorithm
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Space Star Technology Co.,Ltd.,Beijing 100095,China

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    摘要:

    编码辅助载波同步可以充分利用译码过程的数据符号软值信息进行载波参数估计,在低信噪比条件下展现出优异性能。经典的编码辅助载波同步方法主要通过期望最大算法或其级数展开近似求解包含隐变量的非线性方程,但存在复杂度较高或估计精度有限的问题。本文利用极坐标形式下对数似然函数导数的雅可比矩阵易于推导的特点,使用Newton-Raphson迭代算法对非线性函数进行求解,在保持参数估计性能不降低的条件下,大幅降低了编码辅助载波同步参数估计的计算复杂度。计算机仿真表明,本文算法可在误码率性能与期望最大算法相当的情况下,大幅降低计算复杂度,接近级数展开近似算法,可适用于二进制相移键控(BPSK)、正交相移键控(QPSK)、正交振幅调制(QAM)等单载波线性调制系统。

    Abstract:

    Coded-aided carrier synchronization can fully utilize the soft information of data symbols from the decoding process for carrier parameter estimation, demonstrating excellent performance under low Signal-to-Noise Ratio(SNR) conditions. Classical coded-aided carrier synchronization methods mainly solve nonlinear equations containing hidden variables through the Expectation-Maximization (EM) algorithm or its series expansion approximations, but suffer from high complexity or limited estimation accuracy. This paper exploits the characteristic that the Jacobian matrix of the log-likelihood function derivative in polar form is easy to derive, and uses the Newton-Raphson iterative algorithm to solve the nonlinear function. Under the condition of maintaining parameter estimation performance without degradation, the computational complexity of coded-aided carrier synchronization parameter estimation is significantly reduced. Computer simulations show that the proposed algorithm can achieve Bit Error Rate(BER) performance comparable to the EM algorithm while significantly reducing computational complexity, approaching that of series expansion approximation algorithms. It is applicable to single carrier linear modulation systems such as Binary Phase Shift Keying(BPSK), Quadrature Phase Shift Keying(QPSK), and Quadrature Amplitude Modulation(QAM).

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王金杰,张少甫,李婷婷,等. Newton‒Raphson算法的低复杂度编码辅助载波同步研究[J].太赫兹科学与电子信息学报,2026,24(3):314~323. DOI:10.11805/TKYDA2025200.
WANG Jinjie, ZHANG Shaofu, LI Tingting, et al. Research on low-complexity coded-assisted carrier synchronization based on Newton‒Raphson algorithm[J]. Journal of Terahertz Science and Electronic Information,2026,24(3):314-323. DOI:10.11805/TKYDA2025200.

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  • 收稿日期:2025-06-19
  • 最后修改日期:2025-10-22
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  • 在线发布日期: 2026-04-03
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