Performance analysis of complex adaptive IIR notch filters

In this paper, we present a new structure for complex adaptive HR not cll filter which is useful for the rejection of narrow-band interference from broad-band si signals ill QPSK communication systems. The proposed structure is based oil gradient algorithm. A performance analysis for convergence properties is developed. It: has been shown that the convergence speed does not depend on the variance of input white noise. The effects of colored Gaussian noise to convergence speed have been analyzed. The results of computer simulation are shown which confirm The theoretical prediction.