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gr_adaptive_fir_ccf.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_ADAPTIVE_FIR_CCF_H
00024 #define INCLUDED_GR_ADAPTIVE_FIR_CCF_H
00025 
00026 #include <gr_sync_decimator.h>
00027 
00032 class gr_adaptive_fir_ccf : public gr_sync_decimator
00033 {
00034 private:
00035   std::vector<float>  d_new_taps;
00036   bool                d_updated;
00037 
00038 protected:
00039   float               d_error;
00040   std::vector<float>  d_taps;
00041 
00042   // Override to calculate error signal per output
00043   virtual float error(const gr_complex &out) = 0; 
00044 
00045   // Override to calculate new weight from old, corresponding input
00046   virtual void update_tap(float &tap, const gr_complex &in) = 0;
00047   
00048 public:
00049   gr_adaptive_fir_ccf(char *name, int decimation, const std::vector<float> &taps);
00050   void set_taps(const std::vector<float> &taps);
00051 
00052   int work(int noutput_items,
00053            gr_vector_const_void_star &input_items,
00054            gr_vector_void_star &output_items);
00055 };
00056 
00057 #endif

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