transceiver: Add an option to generate random Access Bursts.
diff --git a/GSM/GSMCommon.cpp b/GSM/GSMCommon.cpp
index 3b5331f..8aba3be 100644
--- a/GSM/GSMCommon.cpp
+++ b/GSM/GSMCommon.cpp
@@ -56,6 +56,9 @@
const BitVector GSM::gRACHSynchSequence("01001011011111111001100110101010001111000");
+// |-head-||---------midamble----------------------||--------------data----------------||t|
+const BitVector GSM::gRACHBurst("0011101001001011011111111001100110101010001111000110111101111110000111001001010110011000");
+
int32_t GSM::FNDelta(int32_t v1, int32_t v2)
{
diff --git a/GSM/GSMCommon.h b/GSM/GSMCommon.h
index 004536b..8b8d5e8 100644
--- a/GSM/GSMCommon.h
+++ b/GSM/GSMCommon.h
@@ -53,6 +53,8 @@
/** Random access burst synch. sequence */
extern const BitVector gRACHSynchSequence;
+/** Random access burst synch. sequence, GSM 05.02 5.2.7 */
+extern const BitVector gRACHBurst;
/**@name Modulus operations for frame numbers. */
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index 1f59f78..a19d770 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -90,6 +90,9 @@
case Transceiver::FILLER_EDGE_RAND:
burst = generateEdgeBurst(rtsc);
break;
+ case Transceiver::FILLER_ACCESS_RAND:
+ burst = genRandAccessBurst(sps, n);
+ break;
case Transceiver::FILLER_ZERO:
default:
burst = generateEmptyBurst(sps, n);
diff --git a/Transceiver52M/Transceiver.h b/Transceiver52M/Transceiver.h
index 472adbe..013f13b 100644
--- a/Transceiver52M/Transceiver.h
+++ b/Transceiver52M/Transceiver.h
@@ -156,6 +156,7 @@
FILLER_ZERO,
FILLER_NORM_RAND,
FILLER_EDGE_RAND,
+ FILLER_ACCESS_RAND,
};
private:
diff --git a/Transceiver52M/osmo-trx.cpp b/Transceiver52M/osmo-trx.cpp
index 3026f55..a734a0b 100644
--- a/Transceiver52M/osmo-trx.cpp
+++ b/Transceiver52M/osmo-trx.cpp
@@ -187,6 +187,9 @@
case Transceiver::FILLER_EDGE_RAND:
fillstr = "EDGE busrts with random payload";
break;
+ case Transceiver::FILLER_ACCESS_RAND:
+ fillstr = "Access busrts with random payload";
+ break;
}
std::ostringstream ost("");
@@ -319,6 +322,7 @@
" -f Enable C0 filler table\n"
" -o Set baseband frequency offset (default=auto)\n"
" -r Random burst test mode with TSC\n"
+ " -A Random burst test mode with Access Bursts\n"
" -R RSSI to dBm offset in dB (default=0)\n"
" -S Swap channels (UmTRX only)\n",
"EMERG, ALERT, CRT, ERR, WARNING, NOTICE, INFO, DEBUG");
@@ -341,7 +345,7 @@
config->swap_channels = false;
config->edge = false;
- while ((option = getopt(argc, argv, "ha:l:i:p:c:dxfo:s:r:R:Se")) != -1) {
+ while ((option = getopt(argc, argv, "ha:l:i:p:c:dxfo:s:r:AR:Se")) != -1) {
switch (option) {
case 'h':
print_help();
@@ -381,6 +385,9 @@
config->rtsc = atoi(optarg);
config->filler = Transceiver::FILLER_NORM_RAND;
break;
+ case 'A':
+ config->filler = Transceiver::FILLER_ACCESS_RAND;
+ break;
case 'R':
config->rssi_offset = atof(optarg);
break;
diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 9674aa8..2182550 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1005,6 +1005,39 @@
return burst;
}
+/*
+ * Generate a random GSM access burst.
+ */
+signalVector *genRandAccessBurst(int sps, int tn)
+{
+ if ((tn < 0) || (tn > 7))
+ return NULL;
+ if ((sps != 1) && (sps != 4))
+ return NULL;
+
+ int i = 0;
+ BitVector *bits = new BitVector(88);
+ signalVector *burst;
+
+ /* head and synch bits */
+ for (int n = 0; i < 49; i++, n++)
+ (*bits)[i] = gRACHBurst[n];
+
+ /* Random bits */
+ for (; i < 85; i++)
+ (*bits)[i] = rand() % 2;
+
+ /* Tail bits */
+ for (; i < 88; i++)
+ (*bits)[i] = 0;
+
+ int guard = 68 + !(tn % 4);
+ burst = modulateBurst(*bits, guard, sps);
+ delete bits;
+
+ return burst;
+}
+
signalVector *generateEmptyBurst(int sps, int tn)
{
if ((tn < 0) || (tn > 7))
diff --git a/Transceiver52M/sigProcLib.h b/Transceiver52M/sigProcLib.h
index 93251b5..7af58e7 100644
--- a/Transceiver52M/sigProcLib.h
+++ b/Transceiver52M/sigProcLib.h
@@ -122,6 +122,9 @@
/** Generate a normal GSM burst with random payload - 4 or 1 SPS */
signalVector *genRandNormalBurst(int tsc, int sps, int tn);
+/** Generate an access GSM burst with random payload - 4 or 1 SPS */
+signalVector *genRandAccessBurst(int sps, int tn);
+
/** Generate a dummy GSM burst - 4 or 1 SPS */
signalVector *generateDummyBurst(int sps, int tn);