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/* -*- 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 <digital_api.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_API 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 Müller (M&M) based clock recovery block with float input, float output.
* \ingroup sync_blk
* \ingroup digital
*
* This implements the Mueller and Müller (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_API 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_API 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
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