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/* -*- c++ -*- */
/*
* Copyright 2004 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_GSM_RECEIVER_CF_H
#define INCLUDED_GSM_RECEIVER_CF_H
#include <gr_block.h>
#include <gr_complex.h>
#include <gr_feval.h>
#include <boost/circular_buffer.hpp>
class gsm_receiver_cf;
/*
* We use boost::shared_ptr's instead of raw pointers for all access
* to gr_blocks (and many other data structures). The shared_ptr gets
* us transparent reference counting, which greatly simplifies storage
* management issues. This is especially helpful in our hybrid
* C++ / Python system.
*
* See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
*
* As a convention, the _sptr suffix indicates a boost::shared_ptr
*/
typedef boost::shared_ptr<gsm_receiver_cf> gsm_receiver_cf_sptr;
typedef boost::circular_buffer<float> circular_buffer_float;
/*!
* \brief Return a shared_ptr to a new instance of gsm_receiver_cf.
*
* To avoid accidental use of raw pointers, gsm_receiver_cf's
* constructor is private. howto_make_square_ff is the public
* interface for creating new instances.
*/
gsm_receiver_cf_sptr gsm_make_receiver_cf( gr_feval_dd *tuner, int osr );
/*!
* \brief Receives fcch
* \ingroup block
* \sa
*/
class gsm_receiver_cf : public gr_block
{
private:
gr_feval_dd *d_tuner;
const int d_osr;
int d_counter;
float d_prev_freq_offset;
circular_buffer_float d_phase_diff_buffer;
double d_x_temp, d_x2_temp, d_mean;
int d_fcch_count;
double d_best_sum;
enum states
{
fcch_search, sch_search
} d_state;
friend gsm_receiver_cf_sptr gsm_make_receiver_cf( gr_feval_dd *tuner, int osr );
gsm_receiver_cf( gr_feval_dd *tuner, int osr );
bool find_fcch_burst( const gr_complex *in, const int nitems );
bool find_sch_burst( const gr_complex *in, const int nitems , gr_complex *out);
double compute_freq_offset ( );
void set_frequency ( );
public:
~gsm_receiver_cf();
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 );
};
#endif /* INCLUDED_GSM_RECEIVER_CF_H */
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