| 摘要: |
| 针对多普勒条件下接收端复信号的频率估计难的问题，研究了一种基于离散傅里叶变换与迭代频率估计的内插综合算法。区别于经典的内插算法，新算法在迭代频率内插算法基础上充分利用复数快速傅里叶变换结果的实虚部值，并通过最大峰值频谱和相邻两侧谱线以极高精度内插估计出复信号的频率参数。仿真结果分析表明,在二次迭代条件下信噪比为-10 dB时，该算法估计均方根误差仍能逼近克拉美-罗限的1.002 1倍。该算法在同等条件下比经典的Rife、Quinn和IIN算法具有更高的准确性、稳定性和可靠性。 |
| 关键词: 卫星通信 迭代频率估计 离散傅里叶变换 内插算法 |
| DOI： |
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| 基金项目: |
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| A novel interpolation algorithm with high accuracy for T_IIN frequency estimation |
| XU Yong,CHEN Haiteng,LI Miao |
| () |
| Abstract: |
| In order to solve the difficult problem of frequency estimation of complex signal at the receiver in Doppler condition,a novel interpolation algorithm based on discrete Fourier transform (DFT) and iterative frequency estimation (IIN) is studied. Different from classical interpolation algorithms,the new algorithm makes full use of complex FFT results in the IIN algorithm on the basis of the real and imaginary parts of the value,and estimates the frequency parameters of complex signals by using the maximum peak frequency and the adjacent spectral lines with high precision on both sides of the interpolation. The simulation results show that the root mean square error(RMSE) of the proposed algorithm is close to 1.002 1 times the Cramer-Rao Lower bound (CRLB) when the signal-to-noise ratio (SNR) is -10 dB under the condition of two iterations. The proposed algorithm has higher accuracy,stability and reliability than the classical Rife,Quinn and IIN algorithms under the same condition. |
| Key words: satellite communication iterative frequency estimation discrete Fourier transform interpolation algorithm |
