/* -*- c++ -*- */
/*
 * Copyright 2011 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <digital_lms_dd_equalizer_cc.h>
#include <gr_io_signature.h>
#include <gr_misc.h>
#include <iostream>

digital_lms_dd_equalizer_cc_sptr
digital_make_lms_dd_equalizer_cc(int num_taps, float mu, int sps,
				 digital_constellation_sptr cnst)
{
  return gnuradio::get_initial_sptr(new digital_lms_dd_equalizer_cc(num_taps, mu,
								    sps, cnst));
}

digital_lms_dd_equalizer_cc::digital_lms_dd_equalizer_cc(int num_taps, float mu,
							 int sps,
							 digital_constellation_sptr cnst)
  : gr_adaptive_fir_ccc("lms_dd_equalizer_cc", sps,
			std::vector<gr_complex>(num_taps, gr_complex(0,0))),
    d_taps(num_taps), d_cnst(cnst)
{
  set_gain(mu);
  if (num_taps > 0)
    d_taps[num_taps/2] = 1.0;
}




/*
int
digital_lms_dd_equalizer_cc::work (int noutput_items,
				   gr_vector_const_void_star &input_items,
				   gr_vector_void_star &output_items)
{
  const gr_complex *in = (const gr_complex *) input_items[0];
  gr_complex *out = (gr_complex *) output_items[0];
  
  gr_complex acc, decision, error;

  for(int i = 0; i < noutput_items; i++) {
    acc = 0;

    // Compute output
    for (size_t j=0; j < d_taps.size(); j++) 
      acc += in[i+j] * conj(d_taps[j]);
    
    d_cnst->map_to_points(d_cnst->decision_maker(&acc), &decision);
    error = decision - acc;
    
    //  Update taps
    for (size_t j=0; j < d_taps.size(); j++)
      d_taps[j] += d_mu * conj(error) * in[i+j];
    
    out[i] = acc;
  }

  return noutput_items;
}
*/