diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2013-03-31 12:17:02 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2015-09-22 16:41:27 +0200 |
| commit | c910a332b261d48fa594f1a3133987c8f650dcb1 (patch) | |
| tree | a8d6ecfdc7866ca1c63b0c548a21dc09829bbdec /src/osmo-bts-trx/gsm0503_conv.c | |
| parent | f62a64e440a1cb8a654e3f49b8f4202022e0348a (diff) | |
TRX: Support for TCH/H and GSM half rate transcoding
Diffstat (limited to 'src/osmo-bts-trx/gsm0503_conv.c')
| -rw-r--r-- | src/osmo-bts-trx/gsm0503_conv.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/osmo-bts-trx/gsm0503_conv.c b/src/osmo-bts-trx/gsm0503_conv.c index 4b95f72c..71738969 100644 --- a/src/osmo-bts-trx/gsm0503_conv.c +++ b/src/osmo-bts-trx/gsm0503_conv.c @@ -81,6 +81,80 @@ const struct osmo_conv_code gsm0503_conv_tch_fr = { }; +/* + * GSM HR convolutional coding + * + * G_0 = 1 + x^2 + x^3 + x^5 + x^6 + * G_1 = 1 + x + x^4 + x^6 + * G_3 = 1 + x + x^2 + x^3 + x^4 + x^6 + */ + +static const uint8_t conv_tch_hr_next_output[][2] = { + { 0, 7 }, { 3, 4 }, { 5, 2 }, { 6, 1 }, + { 5, 2 }, { 6, 1 }, { 0, 7 }, { 3, 4 }, + { 3, 4 }, { 0, 7 }, { 6, 1 }, { 5, 2 }, + { 6, 1 }, { 5, 2 }, { 3, 4 }, { 0, 7 }, + { 4, 3 }, { 7, 0 }, { 1, 6 }, { 2, 5 }, + { 1, 6 }, { 2, 5 }, { 4, 3 }, { 7, 0 }, + { 7, 0 }, { 4, 3 }, { 2, 5 }, { 1, 6 }, + { 2, 5 }, { 1, 6 }, { 7, 0 }, { 4, 3 }, + { 7, 0 }, { 4, 3 }, { 2, 5 }, { 1, 6 }, + { 2, 5 }, { 1, 6 }, { 7, 0 }, { 4, 3 }, + { 4, 3 }, { 7, 0 }, { 1, 6 }, { 2, 5 }, + { 1, 6 }, { 2, 5 }, { 4, 3 }, { 7, 0 }, + { 3, 4 }, { 0, 7 }, { 6, 1 }, { 5, 2 }, + { 6, 1 }, { 5, 2 }, { 3, 4 }, { 0, 7 }, + { 0, 7 }, { 3, 4 }, { 5, 2 }, { 6, 1 }, + { 5, 2 }, { 6, 1 }, { 0, 7 }, { 3, 4 }, +}; + +static const uint8_t conv_tch_hr_next_state[][2] = { + { 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, 51 }, { 52, 53 }, { 54, 55 }, + { 56, 57 }, { 58, 59 }, { 60, 61 }, { 62, 63 }, + { 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, 51 }, { 52, 53 }, { 54, 55 }, + { 56, 57 }, { 58, 59 }, { 60, 61 }, { 62, 63 }, +}; + +static const int conv_tch_hr_puncture[] = { + /* Class 1 bits */ + 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, + 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67, 70, + 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, + 109, 112, 115, 118, 121, 124, 127, 130, 133, 136, 139, 142, + 145, 148, 151, 154, 157, 160, 163, 166, 169, 172, 175, 178, + 181, 184, 187, 190, 193, 196, 199, 202, 205, 208, 211, 214, + 217, 220, 223, 226, 229, 232, 235, 238, 241, 244, 247, 250, + 253, 256, 259, 262, 265, 268, 271, 274, 277, 280, 283, + + /* Tail bits */ + 295, 298, 301, 304, 307, 310, 313, + + /* End */ + -1, +}; + +const struct osmo_conv_code gsm0503_conv_tch_hr = { + .N = 3, + .K = 7, + .len = 98, + .next_output = conv_tch_hr_next_output, + .next_state = conv_tch_hr_next_state, + .puncture = conv_tch_hr_puncture, +}; + + /* TCH/AFS12.2 */ /* ----------- */ |