105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2004 Free Software Foundation, Inc.
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*
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* Gardner symbol recovery block for GR - Copyright 2010, KA1RBI
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_REPEATER_GARDNER_SYMBOL_RECOVERY_CC_H
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#define INCLUDED_REPEATER_GARDNER_SYMBOL_RECOVERY_CC_H
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#include <gr_block.h>
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#include <gr_complex.h>
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#include <gr_math.h>
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class gri_mmse_fir_interpolator_cc;
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class repeater_gardner_costas_cc;
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typedef boost::shared_ptr<repeater_gardner_costas_cc> repeater_gardner_costas_cc_sptr;
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// public constructor
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repeater_gardner_costas_cc_sptr
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repeater_make_gardner_costas_cc (float samples_per_symbol, float gain_mu, float gain_omega, float alpha, float beta, float max_freq, float min_freq);
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/*!
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* \brief Gardner based repeater gardner_costas block with complex input, complex output.
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* \ingroup sync_blk
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*
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* This implements a Gardner discrete-time error-tracking synchronizer.
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*
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* input samples should be within normalized range of -1.0 thru +1.0
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*
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* includes some simplifying approximations KA1RBI
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*/
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class repeater_gardner_costas_cc : public gr_block
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{
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public:
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~repeater_gardner_costas_cc ();
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void forecast(int noutput_items, gr_vector_int &ninput_items_required);
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int general_work (int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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void set_verbose (bool verbose) { d_verbose = verbose; }
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//! Sets value of omega and its min and max values
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void set_omega (float omega);
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protected:
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bool input_sample0(gr_complex, gr_complex& outp);
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bool input_sample(gr_complex, gr_complex& outp);
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repeater_gardner_costas_cc (float samples_per_symbol, float gain_mu, float gain_omega, float alpha, float beta, float max_freq, float min_freq);
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private:
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float d_mu;
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float d_omega, d_gain_omega, d_omega_rel, d_max_omega, d_min_omega, d_omega_mid;
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float d_gain_mu;
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gr_complex d_last_sample;
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gri_mmse_fir_interpolator_cc *d_interp;
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bool d_verbose;
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gr_complex *d_dl;
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int d_dl_index;
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int d_twice_sps;
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float d_timing_error;
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float d_alpha;
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float d_beta;
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uint32_t d_interp_counter;
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float d_theta;
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float d_phase;
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float d_freq;
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float d_max_freq;
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friend repeater_gardner_costas_cc_sptr
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repeater_make_gardner_costas_cc (float samples_per_symbol, float gain_mu, float gain_omega, float alpha, float beta, float max_freq, float min_freq);
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float phase_error_detector_qpsk(gr_complex sample);
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void phase_error_tracking(gr_complex sample);
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};
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#endif
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