| 一种适用于大频偏和低信噪比条件的频率估计器研究 |
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| 引用本文： | 帅涛,任前义,刘静,梁旭文.一种适用于大频偏和低信噪比条件的频率估计器研究[J].宇航学报,2010,31(12). |
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| 作者姓名： | 帅涛 任前义 刘静 梁旭文 |
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| 作者单位： | 上海微小卫星工程中心,上海,200050 |
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| 基金项目： | 上海市自然科学基金(10ZR1429100); 上海市优秀学科带头人计划(08XD14038) |
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| 摘 要： | 为了实现对大频偏和低信噪比条件下信号载波频率快速估计,在比较现有常用估计器基础上,提出一种改进频率估计方案,可以将估计器估计范围提高到数据速率的一半而噪声性能接近MCRB下界。通过仿真和硬件实现,验证了改进频率估计器对大频偏和低信噪比的适用性。
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| 关 键 词： | 信号同步 频率估计 大频偏 低信噪比 |
An Frequency Estimator for Large Frequency Offset and Low SNR Signals |
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| SHUAI Tao,REN Qian-yi,LIU Jing,LIANG Xu-wen.An Frequency Estimator for Large Frequency Offset and Low SNR Signals[J].Journal of Astronautics,2010,31(12). |
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| Authors: | SHUAI Tao REN Qian-yi LIU Jing LIANG Xu-wen |
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| Institution: | SHUAI Tao,REN Qian-yi,LIU Jing,LIANG Xu-wen(Micro-Satellite State Key Joint Laboratory,Chinese Academy of Science,Shanghai 200050,China) |
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| Abstract: | An improved frequency estimator for low signal to noise ration(SNR)and high dynamic condition is put forward in this paper.By calculating the argument of autocorrelations,the improved estimator extends its estimation range to a half data rate and its accuracy is close to MCRB.It can be used in carrier frequency recovery for PSK signals and its applicability is verified by simulation and hardware implementation. |
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| Keywords: | Signal synchronization Frequency estimator Large frequency offset Low SNR |
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