Transceiver52M: Refactor RACH and normal burst detection

Both RACH and normal bursts are detected with the same approach of
midamble correlation combined with peak-to-average ratio. The
difference is the midamble placements and lengths. Thus, there is
no reason to have independent implementations.

This patch creates a common call burstDetect(), while leaving the
correlation window indexing in the original calls.

Signed-off-by: Thomas Tsou <tom@tsou.cc>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6738 19bc5d8c-e614-43d4-8b26-e1612bc8e597

Transceiver52M/Transceiver.cpp

@@ -386,7 +386,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
     float chanOffset;
     success = analyzeTrafficBurst(*vectorBurst,
 				  mTSC,
-				  3.0,
+				  5.0,
 				  mSPS,
 				  &amplitude,
 				  &TOA,
@@ -421,7 +421,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
   else {
     // RACH burst
     success = detectRACHBurst(*vectorBurst,
-			      5.0,  // detection threshold
+			      6.0,
 			      mSPS,
 			      &amplitude,
 			      &TOA);