Affine projection sign subband adaptive filter

Sign algorithms (SAs) have attracted much attention because of their robustness against impulsive interference. To reduce the computational cost of SAs, a sign subband adaptive filter (SSAF) has recently been proposed. In this paper, an affine projection sign subband adaptive filter (APSSAF) is proposed, which updates the tap-weight vector based on several previous input vectors. The APSSAF not only maintains the robustness against impulsive interference, but also increases the convergence rate. Simulation results are presented to demonstrate the improved performance of the proposed algorithm.