90 lines
2.5 KiB
C++
90 lines
2.5 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_TDETECT_CC_H
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#define INCLUDED_REPEATER_TDETECT_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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#include <cic_filter.h>
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class gri_mmse_fir_interpolator_cc;
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class repeater_tdetect_cc;
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typedef boost::shared_ptr<repeater_tdetect_cc> repeater_tdetect_cc_sptr;
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// public constructor
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repeater_tdetect_cc_sptr
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repeater_make_tdetect_cc (int samples_per_symbol, float step_size, int theta, int cic_length);
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/*!
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* \brief symbol timing loop using tone detection - complex input, complex output.
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* \ingroup sync_blk
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*
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* input samples should be within normalized amplitude range of 0 thru +1.0
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*
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* KA1RBI
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*/
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class repeater_tdetect_cc : public gr_block
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{
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public:
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~repeater_tdetect_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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protected:
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repeater_tdetect_cc (int samples_per_symbol, float step_size, int theta, int cic_length);
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private:
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int d_samples_per_symbol;
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int d_half_sps;
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float d_step_size;
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int d_theta;
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int d_cic_length;
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integrator d_integrator;
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comb d_comb;
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delay input_delay;
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int d_l2ctr;
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int d_d2ctr;
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int d_delta;
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float d_delta_c;
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int d_previous_phase_offset;
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friend repeater_tdetect_cc_sptr
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repeater_make_tdetect_cc (int samples_per_symbol, float step_size, int theta, int cic_length);
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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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