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in hardware? Implement delays using shift registers...
A classical design method is based on the inverse fourier transform of the frequency repsonse, multiplied with a window function. I think, it's called "direct" synthesis or something similar.
U should use the method of using a window based design, use a kaiser window and set a sampling rate, bandwidth, attenuation. Compute the group delay using mathematical computations. Refer Proakis for designing FIR filter and u will get some nice ideas.