A practical solution for the regularization of the affine projection algorithm

The regularization of the affine projection algorithm (APA) is of great importance in echo cancellation applications. The regularization parameter, which depends on the level of the near-end signal, is added to the main diagonal of the input signal correlation matrix to ensure the stability of the APA. In this paper, we propose a practical way for evaluating the power of the near-end signal or, equivalently, the signal-to-noise ratio that is explicitly related to the regularization parameter. Simulation results obtained in the context of acoustic echo cancellation support the appealing performance of the proposed solution.