laforge has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmocore/+/31528 )
Change subject: convolutional coding for CSD
......................................................................
convolutional coding for CSD
This patch adds the convolutional code definitions for CSD (circuit
switched data) on TCH/F channels with user bit rates of 2400, 4800, 9600
and 14400 bps.
Related: OS#4396, OS#1572
Change-Id: I412131d7ee2e676402bf8d88394af17c4447b664
---
M src/gsm/libosmogsm.map
M utils/conv_codes_gsm.py
2 files changed, 105 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/28/31528/1
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index ebfa42e..21f8e15 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -121,6 +121,10 @@
gsm0503_cs2_np;
gsm0503_cs3_np;
gsm0503_tch_fr;
+gsm0503_tch_f24;
+gsm0503_tch_f48;
+gsm0503_tch_f96;
+gsm0503_tch_f144;
gsm0503_tch_hr;
gsm0503_tch_afs_12_2;
gsm0503_tch_afs_10_2;
diff --git a/utils/conv_codes_gsm.py b/utils/conv_codes_gsm.py
index 42f340b..a6e471e 100644
--- a/utils/conv_codes_gsm.py
+++ b/utils/conv_codes_gsm.py
@@ -42,6 +42,93 @@
]
),
+ # TCH/F2.4 definition
+ ConvolutionalCode(
+ 72,
+ [
+ (G1, 1),
+ (G2, 1),
+ (G3, 1),
+ (G1, 1),
+ (G2, 1),
+ (G3, 1),
+ ],
+ name = "tch_f24",
+ description = [
+ "TCH/F2.4 convolutional code:",
+ "72 bits blocks, rate 1/6, k = 5",
+ "G1 = 1 + D + D3 + D4",
+ "G2 = 1 + D2 + D4",
+ "G3 = 1 + D + D2 + D3 + D4",
+ "G1 = 1 + D + D3 + D4",
+ "G2 = 1 + D2 + D4",
+ "G3 = 1 + D + D2 + D3 + D4",
+ ]
+ ),
+
+ # TCH/F4.8 definition
+ ConvolutionalCode(
+ 152,
+ [
+ (G1, 1),
+ (G2, 1),
+ (G3, 1),
+ ],
+ name = "tch_f48",
+ description = [
+ "TCH/F4.8 convolutional code:",
+ "152 bits blocks, rate 1/3, k = 5",
+ "G1 = 1 + D + D3 + D4",
+ "G2 = 1 + D2 + D4",
+ "G3 = 1 + D + D2 + D3 + D4",
+ ]
+ ),
+
+ # TCH/F9.6 definition
+ ConvolutionalCode(
+ 240,
+ shared_polys["xcch"],
+ puncture = [
+ 11, 26, 41, 56, 71, 86, 101, 116, 131, 146, 161,
176,
+ 191, 206, 221, 236, 251, 266, 281, 296, 311, 326, 341,
356,
+ 371, 386, 401, 416, 431, 446, 461, 476, -1
+ ],
+ name = "tch_f96",
+ description = [
+ "TCH/F9.6 convolutional code:",
+ "240 bits blocks, rate 1/2, k = 5",
+ "G0 = 1 + D3 + D4",
+ "G1 = 1 + D + D3 + D4",
+ ]
+ ),
+
+ # TCH/F14.4 definition
+ ConvolutionalCode(
+ 290,
+ shared_polys["xcch"],
+ puncture = [
+ 1, 6, 11, 15, 19, 24, 29, 33, 37, 42, 47,
51,
+ 55, 60, 65, 69, 73, 78, 83, 87, 91, 96, 101,
105,
+ 109, 114, 119, 123, 127, 132, 137, 141, 145, 150, 155,
159,
+ 163, 168, 173, 177, 181, 186, 191, 195, 199, 204, 209,
213,
+ 217, 222, 227, 231, 235, 240, 245, 249, 253, 258, 263,
267,
+ 271, 276, 281, 285, 289, 294, 299, 303, 307, 312, 317,
321,
+ 325, 330, 335, 339, 343, 348, 353, 357, 361, 366, 371,
375,
+ 379, 384, 389, 393, 397, 402, 407, 411, 415, 420, 425,
429,
+ 433, 438, 443, 447, 451, 456, 461, 465, 469, 474, 479,
483,
+ 487, 492, 497, 501, 505, 510, 515, 519, 523, 528, 533,
537,
+ 541, 546, 551, 555, 559, 564, 569, 573, 577, 582, 584,
587,
+ -1
+ ],
+ name = "tch_f144",
+ description = [
+ "TCH/F14.4 convolutional code:",
+ "290 bits blocks, rate 1/2, k = 5",
+ "G0 = 1 + D3 + D4",
+ "G1 = 1 + D + D3 + D4",
+ ]
+ ),
+
# RACH definition
ConvolutionalCode(
14,
--
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I412131d7ee2e676402bf8d88394af17c4447b664
Gerrit-Change-Number: 31528
Gerrit-PatchSet: 1
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