Gradient controlled improved proportionate affine projection sign algorithm

Recently, proportionate adaptive filters are commonly used in the acoustic echo cancellation problems. In proportionate adaptive filters, for each coefficient a step-size which proportional to magnitude of that coefficient is applied. Hence, adaptive filter converges more rapidly to its steady state. Developed proportionate method were applied to algorithms which are robust against impulsive noise. Consequently, algorithms which converge quickly and robust against impulsive noise are obtained for acoustic channels. In this paper, we proposed Gradient Controlled Improved Proportionate Affine Projection Sign Algorithm, which is obtained by modifying Gradient Controlled Improved Proportionate Affine Projection Algorithm such that it will work for acoustic channel with impulsive noise. According to the simulation results, proposed algorithm has better performance than the algorithms in the literature in terms of convergence speed.