commit 444ff34396c03b7d085e6916695f4b27dbb79cc6
author Vadim Yanitskiy <axilirator@gmail.com> Mon Oct 22 02:25:23 2018 +0200
committer Vadim Yanitskiy <axilirator@gmail.com> Wed Oct 24 19:28:47 2018 +0000
tree 4a8b577d892fd0cfa9788d5383954dccb0d47fbe
parent a79bc70737c3d8aadb983e926bf6467a12aed8ae

sigProcLib: add a CorrType for extended (11-bit) RACH

This is a preparatory change that enables a possibility to choose
the amount of synch. sequences to be used for Access Burst (RACH)
detection. The VTY flag will be introduced in further changes.

There are two correlation types now:

  - RACH (default) - TS0 only;
  - EXT_RACH - all TS0, TS1, and TS2 together.

Change-Id: Ia4f20524350bb8c380d7e10360758eddae8b03e9
Related: OS#3054

Transceiver52M/sigProcLib.cpp

diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 072fb3b..28c4ded 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1602,18 +1602,22 @@
  *   tail: Search 8 symbols + maximum expected delay
  */
 static int detectRACHBurst(const signalVector &burst, float threshold, int sps,
-                           complex &amplitude, float &toa, unsigned max_toa)
+                           complex &amplitude, float &toa, unsigned max_toa, bool ext)
 {
   int rc, target, head, tail;
-  CorrelationSequence *sync;
+  int i, num_seq;
 
   target = 8 + 40;
   head = 8;
   tail = 8 + max_toa;
-  sync = gRACHSequences[0];
+  num_seq = ext ? 3 : 1;
 
-  rc = detectGeneralBurst(burst, threshold, sps, amplitude, toa,
-                          target, head, tail, sync);
+  for (i = 0; i < num_seq; i++) {
+    rc = detectGeneralBurst(burst, threshold, sps, amplitude, toa,
+                            target, head, tail, gRACHSequences[i]);
+    if (rc > 0)
+      break;
+  }
 
   return rc;
 }
@@ -1682,9 +1686,10 @@
     rc = analyzeTrafficBurst(burst, tsc, threshold, sps,
                              amp, toa, max_toa);
     break;
+  case EXT_RACH:
   case RACH:
     rc = detectRACHBurst(burst, threshold, sps, amp, toa,
-                         max_toa);
+                         max_toa, type == EXT_RACH);
     break;
   default:
     LOG(ERR) << "Invalid correlation type";

Transceiver52M/sigProcLib.h

diff --git a/Transceiver52M/sigProcLib.h b/Transceiver52M/sigProcLib.h
index 9bc7e10..79a5c3f 100644
--- a/Transceiver52M/sigProcLib.h
+++ b/Transceiver52M/sigProcLib.h
@@ -29,6 +29,7 @@
 enum CorrType{
   OFF,         ///< timeslot is off
   TSC,         ///< timeslot should contain a normal burst
+  EXT_RACH,    ///< timeslot should contain an extended access burst
   RACH,        ///< timeslot should contain an access burst
   EDGE,        ///< timeslot should contain an EDGE burst
   IDLE         ///< timeslot is an idle (or dummy) burst