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