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MIMO: implement I/Q correction for sources

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This commit is contained in:
f4exb 2019-05-29 22:09:19 +02:00
parent f9328789d5
commit e361afd29f
3 changed files with 99 additions and 4 deletions
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3
plugins/samplemimo/testmi/testmigui.cpp
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@ -388,9 +388,8 @@ void TestMIGui::updateAmpFineLimit()
void TestMIGui::updateFrequencyShiftLimit()
{
qint64 sampleRate = ui->sampleRate->getValueNew();
qint64 frequencyShift = ui->frequencyShift->getValueNew();
ui->frequencyShift->setValueRange(false, 7, -sampleRate, sampleRate);
ui->frequencyShift->setValue(frequencyShift);
ui->frequencyShift->setValue(m_settings.m_streams[m_streamIndex].m_frequencyShift);
}
void TestMIGui::updateFileRecordStatus()

99
sdrbase/dsp/dspdevicemimoengine.cpp
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@ -357,7 +357,10 @@ void DSPDeviceMIMOEngine::workSampleSink(unsigned int sinkIndex)
// first part of FIFO data
if (part1begin != part1end)
{
// TODO: DC and IQ corrections
// DC and IQ corrections
if (m_sourcesCorrections[sinkIndex].m_dcOffsetCorrection) {
iqCorrections(part1begin, part1end, sinkIndex, m_sourcesCorrections[sinkIndex].m_iqImbalanceCorrection);
}
// feed data to direct sinks
if (sinkIndex < m_basebandSampleSinks.size())
@ -382,7 +385,10 @@ void DSPDeviceMIMOEngine::workSampleSink(unsigned int sinkIndex)
// second part of FIFO data (used when block wraps around)
if(part2begin != part2end)
{
// TODO: DC and IQ corrections
// DC and IQ corrections
if (m_sourcesCorrections[sinkIndex].m_dcOffsetCorrection) {
iqCorrections(part2begin, part2end, sinkIndex, m_sourcesCorrections[sinkIndex].m_iqImbalanceCorrection);
}
// feed data to direct sinks
if (sinkIndex < m_basebandSampleSinks.size())
@ -1048,3 +1054,92 @@ void DSPDeviceMIMOEngine::handleForwardToSpectrumSink(int nbSamples)
m_spectrumSink->feed(readUntil - nbSamples, readUntil, false);
}
}
void DSPDeviceMIMOEngine::iqCorrections(SampleVector::iterator begin, SampleVector::iterator end, int isource, bool imbalanceCorrection)
{
for(SampleVector::iterator it = begin; it < end; it++)
{
m_sourcesCorrections[isource].m_iBeta(it->real());
m_sourcesCorrections[isource].m_qBeta(it->imag());
if (imbalanceCorrection)
{
#if IMBALANCE_INT
// acquisition
int64_t xi = (it->m_real - (int32_t) m_sourcesCorrections[isource].m_iBeta) << 5;
int64_t xq = (it->m_imag - (int32_t) m_sourcesCorrections[isource].m_qBeta) << 5;
// phase imbalance
m_sourcesCorrections[isource].m_avgII((xi*xi)>>28); // <I", I">
m_sourcesCorrections[isource].m_avgIQ((xi*xq)>>28); // <I", Q">
if ((int64_t) m_sourcesCorrections[isource].m_avgII != 0)
{
int64_t phi = (((int64_t) m_sourcesCorrections[isource].m_avgIQ)<<28) / (int64_t) m_sourcesCorrections[isource].m_avgII;
m_sourcesCorrections[isource].m_avgPhi(phi);
}
int64_t corrPhi = (((int64_t) m_sourcesCorrections[isource].m_avgPhi) * xq) >> 28; //(m_avgPhi.asDouble()/16777216.0) * ((double) xq);
int64_t yi = xi - corrPhi;
int64_t yq = xq;
// amplitude I/Q imbalance
m_sourcesCorrections[isource].m_avgII2((yi*yi)>>28); // <I, I>
m_sourcesCorrections[isource].m_avgQQ2((yq*yq)>>28); // <Q, Q>
if ((int64_t) m_sourcesCorrections[isource].m_avgQQ2 != 0)
{
int64_t a = (((int64_t) m_sourcesCorrections[isource].m_avgII2)<<28) / (int64_t) m_sourcesCorrections[isource].m_avgQQ2;
Fixed<int64_t, 28> fA(Fixed<int64_t, 28>::internal(), a);
Fixed<int64_t, 28> sqrtA = sqrt((Fixed<int64_t, 28>) fA);
m_sourcesCorrections[isource].m_avgAmp(sqrtA.as_internal());
}
int64_t zq = (((int64_t) m_sourcesCorrections[isource].m_avgAmp) * yq) >> 28;
it->m_real = yi >> 5;
it->m_imag = zq >> 5;
#else
// DC correction and conversion
float xi = (it->m_real - (int32_t) m_sourcesCorrections[isource].m_iBeta) / SDR_RX_SCALEF;
float xq = (it->m_imag - (int32_t) m_sourcesCorrections[isource].m_qBeta) / SDR_RX_SCALEF;
// phase imbalance
m_sourcesCorrections[isource].m_avgII(xi*xi); // <I", I">
m_sourcesCorrections[isource].m_avgIQ(xi*xq); // <I", Q">
if (m_sourcesCorrections[isource].m_avgII.asDouble() != 0) {
m_sourcesCorrections[isource].m_avgPhi(m_sourcesCorrections[isource].m_avgIQ.asDouble()/m_sourcesCorrections[isource].m_avgII.asDouble());
}
float& yi = xi; // the in phase remains the reference
float yq = xq - m_sourcesCorrections[isource].m_avgPhi.asDouble()*xi;
// amplitude I/Q imbalance
m_sourcesCorrections[isource].m_avgII2(yi*yi); // <I, I>
m_sourcesCorrections[isource].m_avgQQ2(yq*yq); // <Q, Q>
if (m_sourcesCorrections[isource].m_avgQQ2.asDouble() != 0) {
m_sourcesCorrections[isource].m_avgAmp(sqrt(m_sourcesCorrections[isource].m_avgII2.asDouble() / m_sourcesCorrections[isource].m_avgQQ2.asDouble()));
}
// final correction
float& zi = yi; // the in phase remains the reference
float zq = m_sourcesCorrections[isource].m_avgAmp.asDouble() * yq;
// convert and store
it->m_real = zi * SDR_RX_SCALEF;
it->m_imag = zq * SDR_RX_SCALEF;
#endif
}
else
{
// DC correction only
it->m_real -= (int32_t) m_sourcesCorrections[isource].m_iBeta;
it->m_imag -= (int32_t) m_sourcesCorrections[isource].m_qBeta;
}
}
}

1
sdrbase/dsp/dspdevicemimoengine.h
View File

@ -389,6 +389,7 @@ private:
State gotoError(const QString& errorMsg); //!< Go to an error state
void handleSetMIMO(DeviceSampleMIMO* mimo); //!< Manage MIMO device setting
void iqCorrections(SampleVector::iterator begin, SampleVector::iterator end, int isource, bool imbalanceCorrection);
private slots:
void handleData(); //!< Handle data when samples have to be processed