piotr | 437f546 | 2014-02-04 17:57:25 +0100 | [diff] [blame] | 1 | #ifndef INCLUDED_GSM_CONSTANTS_H |
| 2 | #define INCLUDED_GSM_CONSTANTS_H |
| 3 | |
| 4 | #define GSM_SYMBOL_RATE (1625000.0/6.0) //symbols per second |
| 5 | #define GSM_SYMBOL_PERIOD (1.0/GSM_SYMBOL_RATE) //seconds per symbol |
| 6 | |
| 7 | //Burst timing |
| 8 | #define TAIL_BITS 3 |
| 9 | #define GUARD_BITS 8 |
| 10 | #define GUARD_FRACTIONAL 0.25 //fractional part of guard period |
| 11 | #define GUARD_PERIOD GUARD_BITS + GUARD_FRACTIONAL |
| 12 | #define DATA_BITS 57 //size of 1 data block in normal burst |
| 13 | #define STEALING_BIT 1 |
| 14 | #define N_TRAIN_BITS 26 |
| 15 | #define N_SYNC_BITS 64 |
| 16 | #define USEFUL_BITS 142 //(2*(DATA_BITS+STEALING_BIT) + N_TRAIN_BITS ) |
| 17 | #define FCCH_BITS USEFUL_BITS |
| 18 | #define BURST_SIZE (USEFUL_BITS+2*TAIL_BITS) |
piotr | 7f3f366 | 2014-07-08 16:47:53 +0200 | [diff] [blame] | 19 | #define PROCESSED_CHUNK BURST_SIZE+2*GUARD_PERIOD |
piotr | 437f546 | 2014-02-04 17:57:25 +0100 | [diff] [blame] | 20 | |
| 21 | #define SCH_DATA_LEN 39 |
| 22 | #define TS_BITS (TAIL_BITS+USEFUL_BITS+TAIL_BITS+GUARD_BITS) //a full TS (156 bits) |
| 23 | #define TS_PER_FRAME 8 |
| 24 | #define FRAME_BITS (TS_PER_FRAME * TS_BITS + 2) // 156.25 * 8 |
| 25 | #define FCCH_POS TAIL_BITS |
| 26 | #define SYNC_POS 39 |
| 27 | #define TRAIN_POS ( TAIL_BITS + (DATA_BITS+STEALING_BIT) + 5) //first 5 bits of a training sequence |
| 28 | //aren't used for channel impulse response estimation |
| 29 | #define TRAIN_BEGINNING 5 |
| 30 | #define SAFETY_MARGIN 6 // |
| 31 | |
| 32 | #define FCCH_HITS_NEEDED (USEFUL_BITS - 4) |
| 33 | #define FCCH_MAX_MISSES 1 |
| 34 | #define FCCH_MAX_FREQ_OFFSET 100 |
| 35 | |
| 36 | #define CHAN_IMP_RESP_LENGTH 5 |
| 37 | |
piotr | 7c82b17 | 2014-02-08 14:15:27 +0100 | [diff] [blame] | 38 | #define MAX_SCH_ERRORS 10 //maximum number of subsequent sch errors after which gsm receiver goes to find_next_fcch state |
piotr | 437f546 | 2014-02-04 17:57:25 +0100 | [diff] [blame] | 39 | |
| 40 | typedef enum {empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy, dummy_or_normal} burst_type; |
| 41 | typedef enum {unknown, multiframe_26, multiframe_51} multiframe_type; |
| 42 | |
| 43 | static const unsigned char SYNC_BITS[] = { |
| 44 | 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, |
| 45 | 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, |
| 46 | 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, |
| 47 | 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1 |
| 48 | }; |
| 49 | |
| 50 | const unsigned FCCH_FRAMES[] = {0, 10, 20, 30, 40}; |
| 51 | const unsigned SCH_FRAMES[] = {1, 11, 21, 31, 41}; |
| 52 | |
| 53 | const unsigned BCCH_FRAMES[] = {2, 3, 4, 5}; //!!the receiver shouldn't care about logical |
| 54 | //!!channels so this will be removed from this header |
| 55 | 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}; |
| 56 | 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}; |
| 57 | 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}; |
| 58 | |
| 59 | |
| 60 | #define TSC0 0 |
| 61 | #define TSC1 1 |
| 62 | #define TSC2 2 |
| 63 | #define TSC3 3 |
| 64 | #define TSC4 4 |
| 65 | #define TSC5 5 |
| 66 | #define TSC6 6 |
| 67 | #define TSC7 7 |
| 68 | #define TS_DUMMY 8 |
| 69 | |
| 70 | #define TRAIN_SEQ_NUM 9 |
| 71 | |
| 72 | #define TIMESLOT0 0 |
| 73 | #define TIMESLOT1 1 |
| 74 | #define TIMESLOT2 2 |
| 75 | #define TIMESLOT3 3 |
| 76 | #define TIMESLOT4 4 |
| 77 | #define TIMESLOT5 5 |
| 78 | #define TIMESLOT6 6 |
| 79 | #define TIMESLOT7 7 |
| 80 | |
| 81 | |
| 82 | static const unsigned char train_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS] = { |
| 83 | {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}, |
| 84 | {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}, |
| 85 | {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}, |
| 86 | {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}, |
| 87 | {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}, |
| 88 | {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}, |
| 89 | {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}, |
| 90 | {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}, |
| 91 | {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 |
| 92 | }; |
| 93 | |
| 94 | |
| 95 | //Dummy burst 0xFB 76 0A 4E 09 10 1F 1C 5C 5C 57 4A 33 39 E9 F1 2F A8 |
| 96 | static const unsigned char dummy_burst[] = { |
| 97 | 0, 0, 0, |
| 98 | 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, |
| 99 | 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, |
| 100 | 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, |
| 101 | 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, |
| 102 | 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, |
| 103 | 0, 1, 1, 1, 1, 1, 0, 0, |
| 104 | |
| 105 | 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, |
| 106 | 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, |
| 107 | 0, 0, 0, 1, 0, 1, |
| 108 | |
| 109 | 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, |
| 110 | 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, |
| 111 | 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, |
| 112 | 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, |
| 113 | 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, |
| 114 | 1, 1, 1, 0, 1, 0, 1, 0, |
| 115 | 0, 0, 0 |
| 116 | }; |
| 117 | |
| 118 | |
| 119 | /* |
| 120 | * The frequency correction burst is used for frequency synchronization |
| 121 | * of the mobile. This is broadcast in TS0 together with the SCH and |
| 122 | * BCCH. |
| 123 | * |
| 124 | * Modulating the bits below causes a spike at 62.5kHz above (below for |
| 125 | * COMPACT) the center frequency. One can use this spike with a narrow |
| 126 | * band filter to accurately determine the center of the channel. |
| 127 | */ |
| 128 | static const unsigned char fc_fb[] = { |
| 129 | 0, 0, 0, //I don't use this tables, |
| 130 | 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 |
| 131 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //the description is very informative - p.krysik |
| 132 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 133 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 134 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 135 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 136 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 137 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 138 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 139 | 0, 0, 0 |
| 140 | }; |
| 141 | |
| 142 | static const unsigned char fc_compact_fb[] = { |
| 143 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 144 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 145 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 146 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 147 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 148 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 149 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 150 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, |
| 151 | 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 |
| 152 | }; |
| 153 | |
| 154 | |
| 155 | #endif /* INCLUDED_GSM_CONSTANTS_H */ |