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| The Contrastive Study between Direct FFT and Phase Difference in Parameter Estimation of Sinusoidal Signal |
| Li Hui①②,Wang Yan-fei① |
| ①Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; ②Graduate University of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract This paper firstly studies parameter estimation issue directly based on FFT. Thereby, the relationship between the frequency and phase estimation is exposed. Subsequently, the estimation error formula of phase difference arithmetic are deduced and validated by computer simulation. The compare of two methods shows that phase difference arithmetic possesses lesser calculation quantity. Simultaneously, it can gain highly accurate, mutually independent parameter estimation under low SNR. So phase difference arithmetic is easy to realize in engineering field much more.
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Received: 14 August 2008
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Corresponding Authors:
Li Hui
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2010, Vol. 32 
