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Structure adaptation of linear MMSE adaptive filters

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2 Author(s)
Gong, Y. ; Dept. of Electr. & Electron. Eng., Queen''s Univ. of Belfast, UK ; Cowan, C.F.N.

The tap-length, or the number of the taps, is an important structural parameter of the linear MMSE adaptive filter. Although the optimum tap-length that balances performance and complexity varies with scenarios, most current adaptive filters fix the tap-length at some compromise value, making them inefficient to implement especially in time-varying scenarios. A novel gradient search based variable tap-length algorithm is proposed, using the concept of the pseudo-fractional tap-length, and it is shown that the new algorithm can converge to the optimum tap-length in the mean. Results of computer simulations are also provided to verify the analysis.

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Vision, Image and Signal Processing, IEE Proceedings -  (Volume:151 ,  Issue: 4 )