| 基于FFT的多普勒频偏估计算法研究 |
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| 引用本文： | 韩秀峰,吴长奇,郑恒娜.基于FFT的多普勒频偏估计算法研究[J].无线电通信技术,2009,35(4):61-64. |
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| 作者姓名： | 韩秀峰 吴长奇 郑恒娜 |
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| 作者单位： | 燕山大学,信息科学与工程学院,河北,秦皇岛,066004 |
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| 摘 要： | 首先介绍了一种基于FFT的多普勒频偏估计算法,该算法可以在低信噪比下检测出载波多普勒频偏的绝对值大小和正负方向,然后定量分析了时域信号经过FFT变换到频域后信噪比有大幅的提升,且FFT分析的点数和栅栏效应都会影响信噪比的增益和检测概率。理论分析和仿真结果表明,该算法可以有效地降低时域的信噪比阈值,当信噪比大于某一阈值时,其估计精度与输入信号信噪比无关。
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| 关 键 词： | FFT 频偏估计 高斯白噪声 低信噪比 |
Study on Doppler Frequency-deviation Estimation Algorithm Based on FFT |
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| HAN Xiu-feng,WU Chang-qi,ZHENG Heng-na.Study on Doppler Frequency-deviation Estimation Algorithm Based on FFT[J].Radio Communications Technology,2009,35(4):61-64. |
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| Authors: | HAN Xiu-feng WU Chang-qi ZHENG Heng-na |
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| Affiliation: | (College of Information Science and Engineering,Yanshan University, Qinhuangdao, Hebei 066004, China) |
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| Abstract: | The paper proposes a froquency-deviation estimation algorithm based on Fast Fourier Transform that can accurately estimate the polarity and absolute value of the carrier Doppler frequency-deviation. It can be seen from the analysis that the SNR increases enormously after FIT transformation from time domain to frequency domain, and both the number of FFT and the barrier effect will affect the SNR gain and detection probability. The theoretical analysis and simulation results show that the algorithm can effectively reduces the SNR threshold in time domain,and when the SNR is greater than some threshold,the estimation precision is independent of the SNR. |
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| Keywords: | FFT FFT frequency-deviation estimation Gaussian white noise low SNR |
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