Improved Frequency Estimation Algorithm by Least Squares Phase Unwrapping
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Among the frequency estimation methods, the least squares phase unwrapping estimator (LSPUE) that unwraps the phase in the least squares sense has a much better performance than other phase unwrapping estimators. In this paper, based on a more accurate phase model, an improved LSPUE is presented. Compared with other LSPUE, the performance is improved in two aspects. Firstly, when the number of samples is small, our estimator has a lower signal-to-noise ratio (SNR) threshold. Secondly, from the medium SNR, the LSPUE has an asymptotic mean square error (MSE) which is larger than the Cramer–Rao bound (CRB) but the MSE of our estimator converges to the CRB.
KeywordsFrequency estimation Least squares Phase unwrapping
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