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

/*

 * Copyright 2004,2011 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.

 */

#ifndef INCLUDED_DIGITAL_CLOCK_RECOVERY_MM_FF_H

#define        INCLUDED_DIGITAL_CLOCK_RECOVERY_MM_FF_H

#include <gr_block.h>

#include <gr_math.h>

#include <stdio.h>

class gri_mmse_fir_interpolator;

class digital_clock_recovery_mm_ff;

typedef boost::shared_ptr<digital_clock_recovery_mm_ff> digital_clock_recovery_mm_ff_sptr;

// public constructor

digital_clock_recovery_mm_ff_sptr 

digital_make_clock_recovery_mm_ff (float omega, float gain_omega,

                                   float mu, float gain_mu,

                                   float omega_relative_limit=0.001);

/*!

 * \brief Mueller and MÃŒller (M&M) based clock recovery block with float input, float output.

 * \ingroup sync_blk

 * \ingroup digital

 *

 * This implements the Mueller and MÃŒller (M&M) discrete-time error-tracking synchronizer.

 *

 * See "Digital Communication Receivers: Synchronization, Channel

 * Estimation and Signal Processing" by Heinrich Meyr, Marc Moeneclaey, & Stefan Fechtel.

 * ISBN 0-471-50275-8.

 */

class digital_clock_recovery_mm_ff : public gr_block

{

 public:

  ~digital_clock_recovery_mm_ff ();

  void forecast(int noutput_items, gr_vector_int &ninput_items_required);

  int general_work (int noutput_items,

                    gr_vector_int &ninput_items,

                    gr_vector_const_void_star &input_items,

                    gr_vector_void_star &output_items);

  float mu() const { return d_mu;}

  float omega() const { return d_omega;}

  float gain_mu() const { return d_gain_mu;}

  float gain_omega() const { return d_gain_omega;}

  void set_gain_mu (float gain_mu) { d_gain_mu = gain_mu; }

  void set_gain_omega (float gain_omega) { d_gain_omega = gain_omega; }

  void set_mu (float mu) { d_mu = mu; }

  void set_omega (float omega){

    d_omega = omega;

    d_min_omega = omega*(1.0 - d_omega_relative_limit);

    d_max_omega = omega*(1.0 + d_omega_relative_limit);

    d_omega_mid = 0.5*(d_min_omega+d_max_omega);

  }

protected:

  digital_clock_recovery_mm_ff (float omega, float gain_omega, float mu, float gain_mu,

                           float omega_relative_limit);

 private:

  float                         d_mu;                // fractional sample position [0.0, 1.0]

  float                         d_omega;        // nominal frequency

  float                                d_min_omega;        // minimum allowed omega 

  float                         d_omega_mid;         // average omega

  float                                d_max_omega;        // maximum allowed omega

  float                         d_gain_omega;        // gain for adjusting omega

  float                         d_gain_mu;        // gain for adjusting mu

  float                         d_last_sample;

  gri_mmse_fir_interpolator         *d_interp;

  FILE                                *d_logfile;

  float                                d_omega_relative_limit;        // used to compute min and max omega

  friend digital_clock_recovery_mm_ff_sptr

  digital_make_clock_recovery_mm_ff (float omega, float gain_omega,

                                     float mu, float gain_mu,

                                     float omega_relative_limit);

};

#endif