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Automatic design of frequency sampling filters by hybrid genetic algorithm techniques

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2 Author(s)
Harris, S.P. ; Sch. of Electron. Commun. & Electr. Eng., Plymouth Univ., UK ; Ifeachor, E.C.

A new method of designing recursive and nonrecursive frequency sampling filters is presented. We investigate the use of a hybrid real-coded genetic algorithm (GA) for optimising transition sample values to give the maximum stopband attenuation. A modification allows the coefficient wordlength to be optimized concurrently, thereby reducing the overall number of design steps and simplifying the design process. The technique is able to consistently optimize filters with up to six transition samples. Designing digital filters is a complex process involving optimization at several discrete design steps. The techniques presented could form the basis for integrating several of the optimizations. Investigations into increasing this integration by using a binary-coded GA to optimize nonlinear phase, quantized coefficient FIR filters are introduced, with an analysis of the difficulty of the problem from a GA perspective

Published in:

Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 12 )

Date of Publication:

Dec 1998

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