In view of the adaptive selection of step-size factor in sequential blind source separation

a novel variable step-size algorithm is presented based on the correspondence between separating performance index and step-size.The proposed algorithm restructures the performance index by adopting an auxiliary separation system with some restriction and attains the adaptive updating rule of step-size in the light of the index descending in an exponential form.Simulation results show that the convergence and steady-state performance of the proposed method outperforms the fixed step-size and the recently proposed adaptive step-size algorithms in both stationary and non-stationary environments.