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Two Improved Normalized Subband Adaptive Filter Algorithms with Good Robustness Against Impulsive Interferences

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Abstract

To improve the robustness of subband adaptive filter (SAF) against impulsive interferences, we propose two modified SAF algorithms with an individual scale function for each subband, which are derived by maximizing correntropy-based cost function and minimizing logarithm-based cost function, respectively, called MCC-SAF and LC-SAF. Whenever the impulsive interference happens, the subband scale functions can sharply drop the step size, which eliminate the influence of outliers on the tap-weight vector update. Therefore, the proposed algorithms are robust against impulsive interferences and exhibit the faster convergence rate and better tracking capability than the sign SAF (SSAF) algorithm. Besides, in impulse-free interference environments, the proposed algorithms achieve similar convergence performance as the normalized SAF (NSAF) algorithm. Simulation results have demonstrated the performance of our proposed algorithms.

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Acknowledgments

This work was partially supported by National Science Foundation of P.R. China (Grant: 61271340, 61571374 and 61433011) and the Fundamental Research Funds for the Central Universities (Grant: SWJTU12CX026).

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Correspondence to Haiquan Zhao.

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Yu, Y., Zhao, H., Chen, B. et al. Two Improved Normalized Subband Adaptive Filter Algorithms with Good Robustness Against Impulsive Interferences. Circuits Syst Signal Process 35, 4607–4619 (2016). https://doi.org/10.1007/s00034-016-0289-4

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  • DOI: https://doi.org/10.1007/s00034-016-0289-4

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