Bias mitigating in a sign-algorithm for a constrainted adaptive IIR notch filter

Sign-algorithm (SA) for a constrainted adaptive IIR notch filter (ANF) is very attractive because it is simple to implement. Although the slow convergence speed and biased estimate are two main drawbacks of SA, in some applications, it provides satisfactory results. In this work we propose the bias removal technique to mitigate the biased estimate of SA. Computer simulation has been drawn to show the performance of the proposed technique.