| 一种适用于突发信号的载波同步算法 |
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| 引用本文： | 吴迪,葛临东,王彬.一种适用于突发信号的载波同步算法[J].信息工程大学学报,2010,11(4):434-437. |
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| 作者姓名： | 吴迪 葛临东 王彬 |
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| 作者单位： | 信息工程大学,信息工程学院,河南,郑州,450002 |
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| 摘 要： | 针对突发通信中的非数据辅助载波同步问题,提出了一种改进的差分相位频差估计算法。该算法采用DFT频差粗估计的频率搬移方法扩展了估计范围,对频移后的信号进行K阶均值滤波提高了算法的抗噪声性能,并利用高阶差分相位加权精细估计载波频偏,获得了较高的估计精度。结合二阶判决指导数字锁相环,采用联合结构实现载波相位的快速同步。文章给出了算法的实现步骤,并对其性能进行了分析。仿真结果表明,该算法计算复杂度低,估计精度高,收敛速度快,具有较高的实用价值。
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| 关 键 词： | 突发信号 频偏估计 均值滤波 高阶差分相位 数字锁相环 |
Carrier Synchronization Algorithm for Burst Signal |
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| WU Di,GE Lin dong,WANG Bin.Carrier Synchronization Algorithm for Burst Signal[J].Journal of Information Engineering University,2010,11(4):434-437. |
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| Authors: | WU Di GE Lin dong WANG Bin |
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| Affiliation: | (Institute of Information Engineering,Information Engineering University,Zhengzhou 450002,China) |
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| Abstract: | An improved differential phase frequency offset estimator for NDA carrier frequency synchronization in burst communication is proposed.This algorithm extends the frequency range via frequency shifting that is based on a DFT coarse estimator,and then averages the downshifted signal using a simple K-tap averaging filter to improve the performance in low SNR.High estimation accuracy is obtained by weighting the high order differential phase.A joint structure for carrier synchronization is presented by combining the forward frequency estimate with the second order Decision-Directed DPLL.This algorithm is described in detail and the performance is analysed.Simulation results show that the proposed algorithm has lower complexity and high accuracy as well as rapid acquisition.It＇s valuable in practical implementation. |
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| Keywords: | burst signal frequency offset estimation averaging filter high order differential phase digital phase locked loop |
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