Sinusoid signal enhancement in colored noise based on least square kurtosis IIR adaptive notch filter

A new variable step-size algorithm for a second-order lattice form structure adaptive IIR notch filter for detection and estimation frequency of sinusoids in coloured Gaussian noise is proposed. Utilized least square kurtosis of output signal as cost function, the new gradient based algorithm to update frequency of the adaptive IIR notch filter and the new variable step-size algorithm are given. The computer simulation results are shown that the proposed algorithm has better ability in suppressing colored Gaussian noise and better accuracy in estimating parameter at low SNR than previous algorithm.