Structure adaptation of linear MMSE adaptive filters
Gong, Y. and Cowan, C.F.N. (2004) Structure adaptation of linear MMSE adaptive filters. IEE Proceedings - Vision, Image, and Signal Processing, 151 (4). pp. 271-277. ISSN 1350-245X
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To link to this item DOI: 10.1049/ip-vis:20040605
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.