Adaptive combination of proportionate NSAF algorithm based on coefficient difference

In order to improve the convergence performance of the IPNSAF algorithm at a late stage, the IPNSAF algorithm based on coefficient difference (DIPNSAF) is proposed. In the new algorithm, adaptation gain for each tap is proportional to the absolute value of the difference between the current tap-weight estimate and the previous one. Moreover, to overcome the tradeoff of the fixed step-size DIPNSAF between the fast convergence rate and small steady-state misalignment, its convex combination version is proposed. Simulation results for identifying the impulse response with different sparsities have indicated that the proposed algorithms outperform their counterparts.

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