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/* -*- c++ -*- */
/*
* Copyright 2005,2006,2007 Free Software Foundation, Inc.
*
* Gardner symbol recovery block for GR - Copyright 2010, 2011, 2012, 2013 KA1RBI
*
* This file is part of OP25 and part of GNU Radio
*
* This 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.
*
* This software 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 this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_OP25_REPEATER_GARDNER_COSTAS_CC_IMPL_H
#define INCLUDED_OP25_REPEATER_GARDNER_COSTAS_CC_IMPL_H
#include <op25_repeater/gardner_costas_cc.h>
#include <gnuradio/gr_complex.h>
#include <gnuradio/math.h>
#include <gnuradio/filter/mmse_fir_interpolator_cc.h>
// class gr::filter::mmse_fir_interpolator_cc;
namespace gr {
namespace op25_repeater {
class gardner_costas_cc_impl : public gardner_costas_cc
{
private:
uint8_t slicer(float sym);
public:
gardner_costas_cc_impl(float samples_per_symbol, float gain_mu, float gain_omega, float alpha, float beta, float max_freq, float min_freq);
/*!
* \brief Gardner based repeater gardner_costas_cc block with complex input, complex output.
* \ingroup sync_blk
*
* This implements a Gardner discrete-time error-tracking synchronizer.
*
* input samples should be within normalized range of -1.0 thru +1.0
*
* includes some simplifying approximations KA1RBI
*/
~gardner_costas_cc_impl();
// Where all the action really happens
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);
void set_verbose (bool verbose) { d_verbose = verbose; }
//! Sets value of omega and its min and max values
void set_omega (float omega);
protected:
bool input_sample0(gr_complex, gr_complex& outp);
bool input_sample(gr_complex, gr_complex& outp);
private:
float d_mu;
float d_omega, d_gain_omega, d_omega_rel, d_max_omega, d_min_omega, d_omega_mid;
float d_gain_mu;
gr_complex d_last_sample;
gr::filter::mmse_fir_interpolator_cc *d_interp;
bool d_verbose;
gr_complex *d_dl;
int d_dl_index;
int d_twice_sps;
float d_timing_error;
float d_alpha;
float d_beta;
uint32_t d_interp_counter;
float d_theta;
float d_phase;
float d_freq;
float d_max_freq;
uint64_t nid_accum;
float phase_error_detector_qpsk(gr_complex sample);
void phase_error_tracking(gr_complex sample);
};
} // namespace op25_repeater
} // namespace gr
#endif /* INCLUDED_OP25_REPEATER_GARDNER_COSTAS_CC_IMPL_H */
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