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This paper presents a new formulation and design method for a maximally-decimated discrete-Fourier-transform (MDDFT) filter bank with an adjustable group delay. The objective is to show how far we can reduce the group delay in this proposed MDDFT filter bank by using a new design method for a maximum stop-band attenuation FIR low pass prototype filter. However, the design of this filter bank consists of two different series of equidistant frequency shifts from one single low-pass prototype filter. Simulation results show that the overall group delay of our new approach can be reduced to about 59% of the conventional MDDFT filter bank group delay. And most importantly, when we are dealing with mean-square-error-reconstruction (MSER), there is no degradation in performance with our proposed new design method (with the overall group delay reduced), when compared to the conventional MDDFT filter bank.
Date of Conference: 18-21 Dec. 2004