1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/* -*- 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 <vector>
#include <gr_block.h>
#include <gr_complex.h>
#include <gr_feval.h>
#include <gsm_constants.h>
#include <gsm_receiver_config.h>
class gsm_receiver_cf;
typedef boost::shared_ptr<gsm_receiver_cf> gsm_receiver_cf_sptr;
typedef std::vector<gr_complex> vector_complex;
/*!
* \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:
const int d_OSR;
const int d_chan_imp_length;
gr_complex d_sch_training_seq[N_SYNC_BITS]; //encoded training sequence of a SCH burst
gr_complex d_norm_training_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS];
gr_feval_dd *d_tuner;
unsigned d_counter;
//variables used to store result of the find_fcch_burst fuction
int d_fcch_start_pos;
float d_freq_offset;
burst_counter d_burst_nr;
channel_configuration d_channel_conf;
vector_complex d_channel_imp_resp;
int d_ncc;
int d_bcc;
enum states {
first_fcch_search, next_fcch_search, sch_search, //synchronization search part
synchronized //receiver is synchronized in this state
} 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);
double compute_freq_offset(double best_sum, unsigned denominator);
void set_frequency(double freq_offset);
inline float compute_phase_diff(gr_complex val1, gr_complex val2);
bool find_sch_burst(const gr_complex *in, const int nitems , float *out);
int get_sch_chan_imp_resp(const gr_complex *in, gr_complex * chan_imp_resp);
void detect_burst(const gr_complex * in, gr_complex * chan_imp_resp, int burst_start, unsigned char * output_binary);
void gmsk_mapper(const unsigned char * input, int ninput, gr_complex * gmsk_output, gr_complex start_point);
gr_complex correlate_sequence(const gr_complex * sequence, const gr_complex * input_signal, int ninput);
inline void autocorrelation(const gr_complex * input, gr_complex * out, int length);
inline void mafi(const gr_complex * input, int input_length, gr_complex * filter, int filter_length, gr_complex * output);
int get_norm_chan_imp_resp(const gr_complex *in, gr_complex * chan_imp_resp, unsigned search_range, int bcc);
void przetwarzaj_normalny_pakiet(burst_counter burst_nr, unsigned char * pakiet);
void konfiguruj_odbiornik();
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 */
|
