Single Frequency Estimator Based on Prefilter
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摘要: 为在整个测频范围内获得一致的估计性能,提出了在复高斯白噪声环境下估计复单频正弦信号频率的方法.该方法通过采用非矩形窗的前置滤波器提高待测信号的信噪比,并采用迭代方法提高频率的估计精度.与传统的基于相位差分法和自相关技术的方法相比,其能在更低的信噪比下达到Cramér-Rao界.理论分析和仿真试验都表明,该方法在整个测频范围内的估计性能是一致的.
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关键词:
- 频率估计|前置滤波器|Cramé /
- r-Rao界
Abstract: A new method for estimating the frequency of a complex sinusoid in complex white Gaussian noise was proposed to acquire a uniform performance within whole frequency estimation range.With this method,the signal-to-noise ratio(SNR) of input signal can be improved by utilizing a non-rectangle prefilter.Furthermore,compared with some conventional autocorrelation-based and phase-based methods,the new method can attain the Cramér-Rao bound(CRB) even at a low SNR value by using the iterative method.A theoretic analysis and numerical simulation show that the performance of the proposed method is uniform and good within the frequency estimation range.-
Key words:
- frequency estimation|prefilter|Cramé /
- r-Rao bound
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