/* -*- c++ -*- */

/*

 * Copyright 2005 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.

 */

#ifndef INCLUDED_GR_LMS_DFE_CC_H

#define INCLUDED_GR_LMS_DFE_CC_H

#include <gr_sync_block.h>

class gr_lms_dfe_cc;

typedef boost::shared_ptr<gr_lms_dfe_cc> gr_lms_dfe_cc_sptr;

gr_lms_dfe_cc_sptr gr_make_lms_dfe_cc (float lambda_ff, float lambda_fb,

                                       unsigned int num_fftaps, unsigned int num_fbtaps);

/*!

 * \brief Least-Mean-Square Decision Feedback Equalizer (complex in/out)

 * \ingroup eq_blk

 */

class gr_lms_dfe_cc : public gr_sync_block

{

  friend gr_lms_dfe_cc_sptr gr_make_lms_dfe_cc (float lambda_ff, float lambda_fb,

                                                unsigned int num_fftaps, unsigned int num_fbtaps);

  float        d_lambda_ff;

  float        d_lambda_fb;

  std::vector<gr_complex>  d_ff_delayline;

  std::vector<gr_complex>  d_fb_delayline;

  std::vector<gr_complex>  d_ff_taps;

  std::vector<gr_complex>  d_fb_taps;

  unsigned int d_ff_index;

  unsigned int d_fb_index;

  gr_lms_dfe_cc (float lambda_ff, float lambda_fb, 

                 unsigned int num_fftaps, unsigned int num_fbtaps);

  gr_complex slicer_0deg(gr_complex baud);

  gr_complex slicer_45deg(gr_complex baud);

  public:

  int work (int noutput_items,

            gr_vector_const_void_star &input_items,

            gr_vector_void_star &output_items);

};

#endif