3 * Copyright 2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
23 #ifndef INCLUDED_GR_CMA_EQUALIZER_CC_H
24 #define INCLUDED_GR_CMA_EQUALIZER_CC_H
26 #include <gr_adaptive_fir_ccf.h>
28 class gr_cma_equalizer_cc;
29 typedef boost::shared_ptr<gr_cma_equalizer_cc> gr_cma_equalizer_cc_sptr;
31 gr_cma_equalizer_cc_sptr
32 gr_make_cma_equalizer_cc(int num_taps, float modulus, float mu);
35 * \brief Implements constant modulus adaptive filter on complex stream
38 class gr_cma_equalizer_cc : public gr_adaptive_fir_ccf
44 friend gr_cma_equalizer_cc_sptr gr_make_cma_equalizer_cc(int num_taps, float modulus, float mu);
45 gr_cma_equalizer_cc(int num_taps, float modulus, float mu);
49 virtual float error(const gr_complex &out)
51 return (d_modulus - norm(out));
54 virtual void update_tap(float &tap, const gr_complex &in)
56 tap += d_mu*d_error*abs(in);