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
110
111
112
113
114
115
116
117
118
119
|
/* -*- 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gsm_receiver_cf.h>
#include <gr_io_signature.h>
gsm_receiver_cf_sptr
gsm_make_receiver_cf ()
{
return gsm_receiver_cf_sptr (new gsm_receiver_cf ());
}
static const int MIN_IN = 1; // mininum number of input streams
static const int MAX_IN = 1; // maximum number of input streams
static const int MIN_OUT = 1; // minimum number of output streams
static const int MAX_OUT = 1; // maximum number of output streams
/*
* The private constructor
*/
gsm_receiver_cf::gsm_receiver_cf ()
: gr_block ("gsm_receiver",
gr_make_io_signature (MIN_IN, MAX_IN, sizeof (gr_complex)),
gr_make_io_signature (MIN_OUT, MAX_OUT, sizeof (float)))
{
}
/*
* Virtual destructor.
*/
gsm_receiver_cf::~gsm_receiver_cf ()
{
}
int
gsm_receiver_cf::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const float *in = (const float *) input_items[0];
float *out = (float *) output_items[0];
for (int i = 0; i < noutput_items; i++){
out[i] = in[i] * in[i];
}
consume_each (noutput_items);
return noutput_items;
}
bool gsm_receiver_cf::get_fcch_burst()
{
int hit_count = 0;
int miss_count = 0;
int start_pos = -1;
/*
for ( int i=0; i < BBUF_SIZE; i++ ) {
if ( d_burst_buffer[i] > 0 ) {
if ( ! hit_count++ )
start_pos = i;
} else {
if ( hit_count >= FCCH_HITS_NEEDED ) {
break;
} else
if ( ++miss_count > FCCH_MAX_MISSES ) {
start_pos = -1;
hit_count = miss_count = 0;
}
}
}
//Do we have a match?
if ( start_pos >= 0 ) {
//Is it within range? (we know it's long enough then too)
if ( start_pos < 2*MAX_CORR_DIST ) {
d_burst_start = start_pos;
d_bbuf_pos = 0; //load buffer from start
return FCCH;
} else {
//TODO: don't shift a tiny amount
shift_burst( start_pos - MAX_CORR_DIST );
}
} else {
//Didn't find anything
d_burst_start = MAX_CORR_DIST;
d_bbuf_pos = 0; //load buffer from start
}
return UNKNOWN;
*/
}
|
