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transceiver, resamp: insert missing filter values

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With transceiver integration, the resampling filter files were
dropped. This created a working resampling implementation for
the USRP2 / N200, but with spectrum irregulaties that likely
caused issues at longer range operation. Simply reinsert the
filter files and modify the filter initialization to use them.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2689 19bc5d8c-e614-43d4-8b26-e1612bc8e597
This commit is contained in:
kurtis.heimerl
2011-11-26 03:19:28 +00:00
parent 5124717743
commit 01c8396bb0
4 changed files with 87 additions and 5 deletions
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4
Transceiver52M/Makefile.am
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@@ -72,7 +72,9 @@ noinst_HEADERS = \
sigProcLib.h \
Transceiver.h \
USRPDevice.h \
DummyLoad.h
DummyLoad.h \
rcvLPF_651.h \
sendLPF_961.h
USRPping_SOURCES = USRPping.cpp
USRPping_LDADD = \

28
Transceiver52M/rcvLPF_651.h Normal file
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27
Transceiver52M/sendLPF_961.h Normal file
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33
Transceiver52M/sigProcLib.cpp
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@@ -1,5 +1,5 @@
/*
* Copyright 2008 Free Software Foundation, Inc.
* Copyright 2008, 2011 Free Software Foundation, Inc.
*
* This software is distributed under the terms of the GNU Affero Public License.
* See the COPYING file in the main directory for details.
@@ -28,6 +28,8 @@
#include "sigProcLib.h"
#include "GSMCommon.h"
#include "sendLPF_961.h"
#include "rcvLPF_651.h"
#include <Logger.h>
@@ -1171,7 +1173,7 @@ signalVector *createLPF(float cutoffFreq,
int filterLen,
float gainDC)
{
#if 0
signalVector *LPF = new signalVector(filterLen-1);
LPF->isRealOnly(true);
LPF->setSymmetry(ABSSYM);
@@ -1187,11 +1189,34 @@ signalVector *createLPF(float cutoffFreq,
*itr++ = (complex) ys*yg*yw;
sum += ys*yg*yw;
}
#else
double sum = 0.0;
signalVector *LPF;
signalVector::iterator itr;
if (filterLen == 651) { // receive LPF
LPF = new signalVector(651);
LPF->isRealOnly(true);
itr = LPF->begin();
for (int i = 0; i < filterLen; i++) {
*itr++ = complex(rcvLPF_651[i],0.0);
sum += rcvLPF_651[i];
}
}
else {
LPF = new signalVector(961);
LPF->isRealOnly(true);
itr = LPF->begin();
for (int i = 0; i < filterLen; i++) {
*itr++ = complex(sendLPF_961[i],0.0);
sum += sendLPF_961[i];
}
}
#endif
float normFactor = gainDC/sum; //sqrtf(gainDC/vectorNorm2(*LPF));
// normalize power
itr = LPF->begin();
for (int i = 1; i < filterLen; i++) {
for (int i = 0; i < filterLen; i++) {
*itr = *itr*normFactor;
itr++;
}