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