179 lines
6.9 KiB
C++
179 lines
6.9 KiB
C++
/* -*- c++ -*- */
|
|
/*
|
|
* @file
|
|
* @author (C) 2014 by Piotr Krysik <ptrkrysik@gmail.com>
|
|
* @section LICENSE
|
|
*
|
|
* Gr-gsm 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.
|
|
*
|
|
* Gr-gsm 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 gr-gsm; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef INCLUDED_GSM_CONSTANTS_H
|
|
#define INCLUDED_GSM_CONSTANTS_H
|
|
|
|
#define GSM_SYMBOL_RATE (1625000.0/6.0) //symbols per second
|
|
#define GSM_SYMBOL_PERIOD (1.0/GSM_SYMBOL_RATE) //seconds per symbol
|
|
|
|
//Burst timing
|
|
#define TAIL_BITS 3
|
|
#define GUARD_BITS 8
|
|
#define GUARD_FRACTIONAL 0.25 //fractional part of guard period
|
|
#define GUARD_PERIOD GUARD_BITS + GUARD_FRACTIONAL
|
|
#define DATA_BITS 57 //size of 1 data block in normal burst
|
|
#define STEALING_BIT 1
|
|
#define N_TRAIN_BITS 26
|
|
#define N_SYNC_BITS 64
|
|
#define USEFUL_BITS 142 //(2*(DATA_BITS+STEALING_BIT) + N_TRAIN_BITS )
|
|
#define FCCH_BITS USEFUL_BITS
|
|
#define BURST_SIZE (USEFUL_BITS+2*TAIL_BITS)
|
|
#define ACCESS_BURST_SIZE 88
|
|
#define PROCESSED_CHUNK BURST_SIZE+2*GUARD_PERIOD
|
|
|
|
#define SCH_DATA_LEN 39
|
|
#define TS_BITS (TAIL_BITS+USEFUL_BITS+TAIL_BITS+GUARD_BITS) //a full TS (156 bits)
|
|
#define TS_PER_FRAME 8
|
|
#define FRAME_BITS (TS_PER_FRAME * TS_BITS + 2) // 156.25 * 8
|
|
#define FCCH_POS TAIL_BITS
|
|
#define SYNC_POS 39
|
|
#define TRAIN_POS ( TAIL_BITS + (DATA_BITS+STEALING_BIT) + 5) //first 5 bits of a training sequence
|
|
//aren't used for channel impulse response estimation
|
|
#define TRAIN_BEGINNING 5
|
|
#define SAFETY_MARGIN 6 //
|
|
|
|
#define FCCH_HITS_NEEDED (USEFUL_BITS - 4)
|
|
#define FCCH_MAX_MISSES 1
|
|
#define FCCH_MAX_FREQ_OFFSET 100
|
|
|
|
#define CHAN_IMP_RESP_LENGTH 5
|
|
|
|
#define MAX_SCH_ERRORS 10 //maximum number of subsequent sch errors after which gsm receiver goes to find_next_fcch state
|
|
|
|
typedef enum {empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy, dummy_or_normal, normal_or_noise} burst_type;
|
|
typedef enum {unknown, multiframe_26, multiframe_51} multiframe_type;
|
|
|
|
static const unsigned char SYNC_BITS[] = {
|
|
1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0,
|
|
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
|
|
0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1,
|
|
0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1
|
|
};
|
|
|
|
const unsigned FCCH_FRAMES[] = {0, 10, 20, 30, 40};
|
|
const unsigned SCH_FRAMES[] = {1, 11, 21, 31, 41};
|
|
|
|
const unsigned BCCH_FRAMES[] = {2, 3, 4, 5}; //!!the receiver shouldn't care about logical
|
|
//!!channels so this will be removed from this header
|
|
const unsigned TEST_CCH_FRAMES[] = {2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 32, 33, 34, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 48, 49};
|
|
const unsigned TRAFFIC_CHANNEL_F[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24};
|
|
const unsigned TEST51[] = {0, 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};
|
|
|
|
|
|
#define TSC0 0
|
|
#define TSC1 1
|
|
#define TSC2 2
|
|
#define TSC3 3
|
|
#define TSC4 4
|
|
#define TSC5 5
|
|
#define TSC6 6
|
|
#define TSC7 7
|
|
#define TS_DUMMY 8
|
|
|
|
#define TRAIN_SEQ_NUM 9
|
|
|
|
#define TIMESLOT0 0
|
|
#define TIMESLOT1 1
|
|
#define TIMESLOT2 2
|
|
#define TIMESLOT3 3
|
|
#define TIMESLOT4 4
|
|
#define TIMESLOT5 5
|
|
#define TIMESLOT6 6
|
|
#define TIMESLOT7 7
|
|
|
|
|
|
static const unsigned char train_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS] = {
|
|
{0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
|
|
{0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
|
|
{0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0},
|
|
{0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0},
|
|
{0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1},
|
|
{0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0},
|
|
{1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1},
|
|
{1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0},
|
|
{0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1} // DUMMY
|
|
};
|
|
|
|
|
|
//Dummy burst 0xFB 76 0A 4E 09 10 1F 1C 5C 5C 57 4A 33 39 E9 F1 2F A8
|
|
static const unsigned char dummy_burst[] = {
|
|
0, 0, 0,
|
|
1, 1, 1, 1, 1, 0, 1, 1, 0, 1,
|
|
1, 1, 0, 1, 1, 0, 0, 0, 0, 0,
|
|
1, 0, 1, 0, 0, 1, 0, 0, 1, 1,
|
|
1, 0, 0, 0, 0, 0, 1, 0, 0, 1,
|
|
0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
|
|
0, 1, 1, 1, 1, 1, 0, 0,
|
|
|
|
0, 1, 1, 1, 0, 0, 0, 1, 0, 1,
|
|
1, 1, 0, 0, 0, 1, 0, 1, 1, 1,
|
|
0, 0, 0, 1, 0, 1,
|
|
|
|
0, 1, 1, 1, 0, 1, 0, 0, 1, 0,
|
|
1, 0, 0, 0, 1, 1, 0, 0, 1, 1,
|
|
0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
|
|
1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
|
|
0, 0, 0, 1, 0, 0, 1, 0, 1, 1,
|
|
1, 1, 1, 0, 1, 0, 1, 0,
|
|
0, 0, 0
|
|
};
|
|
|
|
|
|
/*
|
|
* The frequency correction burst is used for frequency synchronization
|
|
* of the mobile. This is broadcast in TS0 together with the SCH and
|
|
* BCCH.
|
|
*
|
|
* Modulating the bits below causes a spike at 62.5kHz above (below for
|
|
* COMPACT) the center frequency. One can use this spike with a narrow
|
|
* band filter to accurately determine the center of the channel.
|
|
*/
|
|
static const unsigned char fc_fb[] = {
|
|
0, 0, 0, //I don't use this tables,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //I copied this here from burst_types.h because
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //the description is very informative - p.krysik
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0
|
|
};
|
|
|
|
static const unsigned char fc_compact_fb[] = {
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
|
|
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0
|
|
};
|
|
|
|
|
|
#endif /* INCLUDED_GSM_CONSTANTS_H */
|