[PATCH] osmo-trx[master]: BitVector: Convert SoftVector from 0..1 to -1..+1 soft bits.

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Alexander Chemeris gerrit-no-reply at lists.osmocom.org
Tue Mar 21 03:47:40 UTC 2017


Review at  https://gerrit.osmocom.org/2142

BitVector: Convert SoftVector from 0..1 to -1..+1 soft bits.

This makes code simpler and will allow us send -127..127 soft bits towards
osmo-bts instead of 0..255 bits.

Change-Id: I16ecc3d4c829dcf0f619ad995bc9d4a4ed8af0a4
---
M CommonLibs/BitVector.cpp
M CommonLibs/BitVector.h
2 files changed, 13 insertions(+), 13 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-trx refs/changes/42/2142/1

diff --git a/CommonLibs/BitVector.cpp b/CommonLibs/BitVector.cpp
index b77a4c4..3b556b9 100644
--- a/CommonLibs/BitVector.cpp
+++ b/CommonLibs/BitVector.cpp
@@ -30,6 +30,7 @@
 #include <iostream>
 #include <stdio.h>
 #include <sstream>
+#include <math.h>
 
 using namespace std;
 
@@ -268,7 +269,7 @@
 	resize(source.size());
 	for (size_t i=0; i<size(); i++) {
 		if (source.bit(i)) mStart[i]=1.0F;
-		else mStart[i]=0.0F;
+		else mStart[i]=-1.0F;
 	}
 }
 
@@ -278,7 +279,7 @@
 	size_t sz = size();
 	BitVector newSig(sz);
 	for (size_t i=0; i<sz; i++) {
-		if (mStart[i]>0.5F) newSig[i]=1;
+		if (mStart[i]>0.0F) newSig[i]=1;
 		else newSig[i] = 0;
 	}
 	return newSig;
@@ -291,8 +292,7 @@
 	int len = vec.size();
 	float avg = 0; float low = 1;
 	for (int i = 0; i < len; i++) {
-		float bit = vec[i];
-		float energy = 2*((bit < 0.5) ? (0.5-bit) : (bit-0.5));
+		float energy = fabsf(vec[i]);
 		if (energy < low) low = energy;
 		avg += energy/len;
 	}
@@ -304,12 +304,12 @@
 ostream& operator<<(ostream& os, const SoftVector& sv)
 {
 	for (size_t i=0; i<sv.size(); i++) {
-		if (sv[i]<0.25) os << "0";
-		else if (sv[i]<0.4) os << "o";
-		else if (sv[i]<0.5) os << ".";
-		else if (sv[i]>0.75) os << "1";
-		else if (sv[i]>0.6) os << "|";
-		else if (sv[i]>0.5) os << "'";
+		if (sv[i]<-0.5) os << "0";
+		else if (sv[i]<-0.25) os << "o";
+		else if (sv[i]<0.0) os << ".";
+		else if (sv[i]>0.5) os << "1";
+		else if (sv[i]>0.25) os << "|";
+		else if (sv[i]>0.0) os << "'";
 		else os << "-";
 	}
 	return os;
diff --git a/CommonLibs/BitVector.h b/CommonLibs/BitVector.h
index 7473c32..d2acb5f 100644
--- a/CommonLibs/BitVector.h
+++ b/CommonLibs/BitVector.h
@@ -290,19 +290,19 @@
 	//@}
 
 	// How good is the SoftVector in the sense of the bits being solid?
-	// Result of 1 is perfect and 0 means all the bits were 0.5
+	// Result of 1 is perfect and 0 means all the bits were 0.0
 	// If plow is non-NULL, also return the lowest energy bit.
 	float getEnergy(float *low=0) const;
 
 	/** Fill with "unknown" values. */
-	void unknown() { fill(0.5F); }
+	void unknown() { fill(0.0F); }
 
 	/** Return a hard bit value from a given index by slicing. */
 	bool bit(size_t index) const
 	{
 		const float *dp = mStart+index;
 		assert(dp<mEnd);
-		return (*dp)>0.5F;
+		return (*dp)>0.0F;
 	}
 
 	/** Slice the whole signal into bits. */

-- 
To view, visit https://gerrit.osmocom.org/2142
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I16ecc3d4c829dcf0f619ad995bc9d4a4ed8af0a4
Gerrit-PatchSet: 1
Gerrit-Project: osmo-trx
Gerrit-Branch: master
Gerrit-Owner: Alexander Chemeris <Alexander.Chemeris at gmail.com>



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