Add functions for extended RACH coding
Add support for extended RACH (11 bit) according 3GPP TS 45.003 ยง5.3.2:
* convolutional code with puncturing
* encoding/decoding routines
* corresponding tests
Change-Id: I85a34a82d5cd39a594ee89d91a2338226066ab5d
Related: OS#1548
diff --git a/tests/coding/coding_test.c b/tests/coding/coding_test.c
index b77410f..511dbb7 100644
--- a/tests/coding/coding_test.c
+++ b/tests/coding/coding_test.c
@@ -110,7 +110,7 @@
/* Encode L2 message */
printf("Encoding: %02x\n", ra);
- gsm0503_rach_encode(bursts_u, &ra, bsic);
+ gsm0503_rach_ext_encode(bursts_u, ra, bsic, false);
/* Prepare soft-bits */
osmo_ubit2sbit(bursts_s, bursts_u, 36);
@@ -126,7 +126,38 @@
gsm0503_rach_decode(&result, bursts_s, bsic);
printf("Decoded: %02x\n", result);
- OSMO_ASSERT(ra == result);
+ if (ra != result)
+ printf("FAIL [RACH]: encoded %u != %u decoded\n", ra, result);
+
+ printf("\n");
+}
+
+static void test_rach_ext(uint8_t bsic, uint16_t ra)
+{
+ uint16_t result = 3000; /* Max ext. RA is 2^11 = 2048 */
+ ubit_t bursts_u[36];
+ sbit_t bursts_s[36];
+
+ /* Encode L2 message */
+ printf("Encoding: %02x\n", ra);
+ gsm0503_rach_ext_encode(bursts_u, ra, bsic, true);
+
+ /* Prepare soft-bits */
+ osmo_ubit2sbit(bursts_s, bursts_u, 36);
+
+ printf("U-Bits: %s\n", osmo_ubit_dump(bursts_u, 36));
+
+ printf("S-Bits: %s\n", osmo_hexdump((uint8_t *)bursts_s, 36));
+
+ /* Destroy some bits */
+ memset(bursts_s + 9, 0, 8);
+
+ /* Decode, correcting errors */
+ gsm0503_rach_ext_decode(&result, bursts_s, bsic);
+ printf("Decoded: %02x\n", result);
+
+ if (ra != result)
+ printf("FAIL [RACH ext]: encoded %u != %u decoded\n", ra, result);
printf("\n");
}
@@ -332,6 +363,12 @@
test_rach(0x1a, i);
}
+ for (i = 0; i < 2048; i++) {
+ test_rach_ext(0x3f, i);
+ test_rach_ext(0x00, i);
+ test_rach_ext(0x1a, i);
+ }
+
for (i = 0; i < len_l2; i++)
test_sch(test_l2[i]);