mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-06 00:41:17 -05:00
107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2018 Edouard Griffiths, F4EXB //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef SDRBASE_DSP_AUTOCORRECTOR_H_
|
|
#define SDRBASE_DSP_AUTOCORRECTOR_H_
|
|
|
|
#include "util/movingaverage.h"
|
|
|
|
template<typename T>
|
|
class AutoCorrector
|
|
{
|
|
public:
|
|
AutoCorrector(qint32 intBits);
|
|
void process(const T& inreal, const T& inimag, qint32& outreal, qint32& outimag);
|
|
void process(qint32& xreal, qint32& ximag);
|
|
void setIQCorrection(bool iqCorrection) { m_iqCorrection = iqCorrection; }
|
|
private:
|
|
bool m_iqCorrection;
|
|
float m_scalef;
|
|
MovingAverageUtil<int32_t, int64_t, 1024> m_iBeta;
|
|
MovingAverageUtil<int32_t, int64_t, 1024> m_qBeta;
|
|
MovingAverageUtil<float, double, 128> m_avgII;
|
|
MovingAverageUtil<float, double, 128> m_avgIQ;
|
|
MovingAverageUtil<float, double, 128> m_avgII2;
|
|
MovingAverageUtil<float, double, 128> m_avgQQ2;
|
|
MovingAverageUtil<double, double, 128> m_avgPhi;
|
|
MovingAverageUtil<double, double, 128> m_avgAmp;
|
|
};
|
|
|
|
template<typename T>
|
|
AutoCorrector<T>::AutoCorrector(qint32 intBits) :
|
|
m_iqCorrection(false),
|
|
m_scalef((float) (1<<(intBits-1)))
|
|
{
|
|
}
|
|
|
|
template<typename T>
|
|
void AutoCorrector<T>::process(const T& inreal, const T& inimag, qint32& outreal, qint32& outimag)
|
|
{
|
|
outreal = inreal;
|
|
outimag = inimag;
|
|
process(outreal, outimag);
|
|
}
|
|
|
|
template<typename T>
|
|
void AutoCorrector<T>::process(qint32& xreal, qint32& ximag)
|
|
{
|
|
m_iBeta(xreal);
|
|
m_qBeta(ximag);
|
|
|
|
if (m_iqCorrection)
|
|
{
|
|
// DC correction and conversion
|
|
float xi = (xreal - (int32_t) m_iBeta) / m_scalef;
|
|
float xq = (ximag - (int32_t) m_qBeta) / m_scalef;
|
|
|
|
// phase imbalance
|
|
m_avgII(xi*xi); // <I", I">
|
|
m_avgIQ(xi*xq); // <I", Q">
|
|
|
|
|
|
if (m_avgII.asDouble() != 0) {
|
|
m_avgPhi(m_avgIQ.asDouble()/m_avgII.asDouble());
|
|
}
|
|
|
|
float yi = xi - m_avgPhi.asDouble()*xq;
|
|
float yq = xq;
|
|
|
|
// amplitude I/Q imbalance
|
|
m_avgII2(yi*yi); // <I, I>
|
|
m_avgQQ2(yq*yq); // <Q, Q>
|
|
|
|
if (m_avgQQ2.asDouble() != 0) {
|
|
m_avgAmp(sqrt(m_avgII2.asDouble() / m_avgQQ2.asDouble()));
|
|
}
|
|
|
|
// final correction
|
|
float zi = yi;
|
|
float zq = m_avgAmp.asDouble() * yq;
|
|
|
|
// convert and store
|
|
xreal = zi * m_scalef;
|
|
ximag = zq * m_scalef;
|
|
}
|
|
else
|
|
{
|
|
xreal -= (int32_t) m_iBeta;
|
|
ximag -= (int32_t) m_qBeta;
|
|
}
|
|
}
|
|
|
|
#endif /* SDRBASE_DSP_AUTOCORRECTOR_H_ */
|