Frequency estimation of single sinusoid in colored noise at low SNR
Zhigang Wang · Systems engineering and electronics · 2007
A power spectrum compensating algorithm is presented for frequency estimation of single sinusoids in colored noise at low SNR.Due to its slowly changing expectation,the fluctuation of power spectrum is suppressed by comparing every frequency bin and a set of nearby bins,a process referred as nonlinear-filtering here.The coarse frequency estimation will then be given through peak-searching algorithm based on nonlinear-filtered power spectrum.The new algorithm is proved stable,although nonlinear process has been applied,by theoretical analysis.The result of computer simulation indicates that the new algorithm can work very well at lower signal-to-noise ratio.