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# # Copyright 2002 Free Software Foundation, Inc. # # This file is part of GNU Radio # # GNU Radio is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. # # GNU Radio is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with GNU Radio; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. # This file contains the source for gen_interpolator_taps, a program which generates optimal interpolator taps for a fractional interpolator. The ideal interpolator requires an infinite tap FIR filter to realize. We design a separate 8 tap filter for each value of mu, the fractional delay, that we are interested in. The taps are selected such that the mean squared error between the ideal frequency response and the approximation is mininimized over all frequencies of interest. In this implementation we define ``frequencies of interest'' as those from -B to +B, where B = 1/(4*Ts), where Ts is the sampling period. For a detailed look at what this is all about, please see Chapter 9 of "Digital Communication Receivers: Synchronization, Channel Estimation and Signal Processing" by Meyr, Moeneclaey and Fechtel, ISBN 0-471-50275-8 NOTE, if you're running gen_interpolator_taps and it seg faults in RANDOM, you're probably using g77-2.96. The fix is to use g77 3.0 or later cd <top_of_build_tree> rm config.cache export F77=g77-3.0.4 ./configure make