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What is the advantage of Variable step size LMS over Leaky-LMS adaptive filter algorithm? Which one has a better performance?

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Variable step size LMS is generally used to improve speed of convergence or decrease steady state error. Leaky adaptation is used to combat problems like potential instability of the filter in a finite-precision implementation. It is closely related to L2 norm regularization technique and results in continuous down scaling of filter coefficients (hence smoothing the extracted filter). So comparing these two techniques is not that meaningful. In fact you can easily use both techniques together to achieve the above advantages.

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  • $\begingroup$ Thank you for your reply. If i understood correctly, Leaky adaptaion is more favor in hardware implementation. Let me be more specific then and ask you if you provide me applications where leaky performs better than VSSLMS; and applications where VSSLMS is preferred over Leaky LMS. $\endgroup$ – fery Jan 3 '17 at 14:00

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