XIANG Jinzhi, CUI Wei, SHEN Qing. Flexible and Accurate Frequency Estimation for Complex Sinusoid Signal by Interpolation Using DFT Samples[J]. Chinese Journal of Electronics, 2018, 27(1): 109-114. doi: 10.1049/cje.2017.09.019
Citation: XIANG Jinzhi, CUI Wei, SHEN Qing. Flexible and Accurate Frequency Estimation for Complex Sinusoid Signal by Interpolation Using DFT Samples[J]. Chinese Journal of Electronics, 2018, 27(1): 109-114. doi: 10.1049/cje.2017.09.019

Flexible and Accurate Frequency Estimation for Complex Sinusoid Signal by Interpolation Using DFT Samples

doi: 10.1049/cje.2017.09.019
Funds:  This work is supported by the National Natural Science Foundation of China (No.61672097).
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  • Corresponding author: CUI Wei (corresponding author) was born in Inner Mongolia Autonomous region, China, in 1976. He received the B.S. degree in physics and Ph.D. degree in Electronics Engineering from Beijing Institute of Technology, Beijing, China, in 1998 and 2003, respectively.. (Email:cuiwei@bit.edu.cn)
  • Received Date: 2017-01-16
  • Rev Recd Date: 2017-05-03
  • Publish Date: 2018-01-10
  • A flexible and accurate frequency estimator is first proposed for frequency estimation of a complex sinusoid weighted with a rectangular window function in additive white Gaussian noise. This proposed frequency estimator can be operated in the application of an arbitrary length discrete Fourier transform where the original input data is padded with any zeroes, which makes it more flexible in practice. The proposed frequency estimator utilizes the maximum sample value and its two adjacent samples in the frequency domain to perform the fine frequency estimation with unbiased results obtained. Then a modified frequency estimator is proposed to estimate the frequency when the complex sinusoid signal is weighted with different nonrectangular window functions. Although the modified frequency estimator is nonanalytic and biased, it can still improve the estimation performance for certain applications. Simulation results demonstrate that both of the proposed frequency estimators are effective to achieve the high frequency estimation accuracy. And the root mean square errors of the proposed frequency estimators approach the Cramer-Rao bound when the signal-to-noise ratio is large enough to make the coarse frequency estimation work effectively.
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