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https://github.com/f4exb/sdrangel.git
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5d5b221e83
Add loop bandwidth and other PLL controls to Channel Analyzer GUI. Fix bug where PLL lock frequency would be incorrect by the decimation factor.
373 lines
12 KiB
C++
373 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 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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// (at your option) any later version. //
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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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#include "chanalyzersink.h"
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#include <QTime>
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#include <QDebug>
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#include <stdio.h>
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#include "dsp/basebandsamplesink.h"
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const unsigned int ChannelAnalyzerSink::m_ssbFftLen = 1024;
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const unsigned int ChannelAnalyzerSink::m_corrFFTLen = 4*m_ssbFftLen;
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ChannelAnalyzerSink::ChannelAnalyzerSink() :
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m_channelSampleRate(48000),
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m_channelFrequencyOffset(0),
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m_sinkSampleRate(48000),
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m_costasLoop(0.002, 2),
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m_sampleSink(nullptr)
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{
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m_usb = true;
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m_magsq = 0;
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SSBFilter = new fftfilt(m_settings.m_lowCutoff / m_channelSampleRate, m_settings.m_bandwidth / m_channelSampleRate, m_ssbFftLen);
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DSBFilter = new fftfilt(m_settings.m_bandwidth / m_channelSampleRate, 2*m_ssbFftLen);
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RRCFilter = new fftfilt(m_settings.m_bandwidth / m_channelSampleRate, 2*m_ssbFftLen);
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m_corr = new fftcorr(2*m_corrFFTLen); // 8k for 4k effective samples
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m_pll.computeCoefficients(m_settings.m_pllBandwidth, m_settings.m_pllDampingFactor, m_settings.m_pllLoopGain);
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m_costasLoop.computeCoefficients(m_settings.m_pllBandwidth);
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applyChannelSettings(m_channelSampleRate, m_sinkSampleRate, m_channelFrequencyOffset, true);
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applySettings(m_settings, true);
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}
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ChannelAnalyzerSink::~ChannelAnalyzerSink()
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{
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delete SSBFilter;
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delete DSBFilter;
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delete RRCFilter;
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delete m_corr;
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}
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void ChannelAnalyzerSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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fftfilt::cmplx *sideband = 0;
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for (SampleVector::const_iterator it = begin; it < end; ++it)
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{
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Complex ci;
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_decimator.getDecim() == 1)
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{
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processOneSample(c, sideband);
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}
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else
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{
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if (m_decimator.decimate(c, ci))
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{
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if (m_settings.m_rationalDownSample)
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{
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Complex cj;
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, ci, &cj))
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{
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processOneSample(cj, sideband);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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else
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{
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processOneSample(ci, sideband);
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}
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}
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}
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}
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if (m_sampleSink) {
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), m_settings.m_ssb); // m_ssb = positive only
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}
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m_sampleBuffer.clear();
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}
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void ChannelAnalyzerSink::processOneSample(Complex& c, fftfilt::cmplx *sideband)
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{
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int n_out;
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if (m_settings.m_ssb)
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{
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n_out = SSBFilter->runSSB(c, &sideband, m_usb);
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}
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else
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{
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if (m_settings.m_rrc) {
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n_out = RRCFilter->runFilt(c, &sideband);
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} else {
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n_out = DSBFilter->runDSB(c, &sideband);
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}
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}
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for (int i = 0; i < n_out; i++)
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{
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fftfilt::cmplx si = sideband[i];
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Real re = si.real() / SDR_RX_SCALEF;
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Real im = si.imag() / SDR_RX_SCALEF;
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m_magsq = re*re + im*im;
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m_channelPowerAvg(m_magsq);
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std::complex<float> mix;
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if (m_settings.m_pll)
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{
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// Use -fPLL to mix (exchange PLL real and image in the complex multiplication)
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if (m_settings.m_costasLoop)
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{
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m_costasLoop.feed(re, im);
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mix = si * std::conj(m_costasLoop.getComplex());
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feedOneSample(mix, m_costasLoop.getComplex());
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}
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else if (m_settings.m_fll)
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{
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m_fll.feed(re, im);
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mix = si * std::conj(m_fll.getComplex());
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feedOneSample(mix, m_fll.getComplex());
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}
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else
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{
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m_pll.feed(re, im);
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mix = si * std::conj(m_pll.getComplex());
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feedOneSample(mix, m_pll.getComplex());
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}
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}
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else
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feedOneSample(si, si);
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}
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}
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void ChannelAnalyzerSink::applyChannelSettings(int channelSampleRate, int sinkSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "ChannelAnalyzerSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " sinkSampleRate: " << sinkSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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bool doApplySampleRate = false;
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if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != channelSampleRate)
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|| (m_sinkSampleRate != sinkSampleRate) || force)
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{
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m_interpolator.create(16, sinkSampleRate, sinkSampleRate / 4.0f);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) sinkSampleRate / (Real) m_settings.m_rationalDownSamplerRate;
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int decim = channelSampleRate / sinkSampleRate;
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m_decimator.setLog2Decim(0);
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for (int i = 0; i < 7; i++) // find log2 between 0 and 6
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{
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if ((decim & 1) == 1)
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{
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qDebug() << "ChannelAnalyzerSink::applyChannelSettings: log2decim: " << i;
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m_decimator.setLog2Decim(i);
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break;
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}
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decim >>= 1;
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}
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doApplySampleRate = true;
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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m_sinkSampleRate = sinkSampleRate;
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if (doApplySampleRate) {
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applySampleRate();
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}
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}
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void ChannelAnalyzerSink::setFilters(int sampleRate, float bandwidth, float lowCutoff)
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{
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qDebug("ChannelAnalyzerSink::setFilters: sampleRate: %d bandwidth: %f lowCutoff: %f",
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sampleRate, bandwidth, lowCutoff);
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if (bandwidth < 0)
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{
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bandwidth = -bandwidth;
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lowCutoff = -lowCutoff;
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m_usb = false;
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}
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else
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{
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m_usb = true;
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}
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if (bandwidth < 100.0f)
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{
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bandwidth = 100.0f;
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lowCutoff = 0;
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}
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SSBFilter->create_filter(lowCutoff / sampleRate, bandwidth / sampleRate);
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DSBFilter->create_dsb_filter(bandwidth / sampleRate);
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RRCFilter->create_rrc_filter(bandwidth / sampleRate, m_settings.m_rrcRolloff / 100.0);
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}
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void ChannelAnalyzerSink::applySettings(const ChannelAnalyzerSettings& settings, bool force)
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{
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qDebug() << "ChannelAnalyzerSink::applySettings:"
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
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<< " m_rcc: " << settings.m_rrc
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<< " m_rrcRolloff: " << settings.m_rrcRolloff / 100.0
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<< " m_bandwidth: " << settings.m_bandwidth
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<< " m_lowCutoff: " << settings.m_lowCutoff
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<< " m_log2Decim: " << settings.m_log2Decim
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<< " m_rationalDownSample: " << settings.m_rationalDownSample
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<< " m_rationalDownSamplerRate: " << settings.m_rationalDownSamplerRate
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<< " m_ssb: " << settings.m_ssb
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<< " m_pll: " << settings.m_pll
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<< " m_fll: " << settings.m_fll
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<< " m_costasLoop: " << settings.m_costasLoop
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<< " m_pllPskOrder: " << settings.m_pllPskOrder
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<< " m_pllBandwidth: " << settings.m_pllBandwidth
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<< " m_pllDampingFactor: " << settings.m_pllDampingFactor
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<< " m_pllLoopGain: " << settings.m_pllLoopGain
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<< " m_inputType: " << (int) settings.m_inputType;
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bool doApplySampleRate = false;
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if ((settings.m_bandwidth != m_settings.m_bandwidth) ||
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(settings.m_lowCutoff != m_settings.m_lowCutoff) ||
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(settings.m_rrcRolloff != m_settings.m_rrcRolloff) || force)
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{
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doApplySampleRate = true;
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}
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if (settings.m_pll != m_settings.m_pll || force)
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{
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if (settings.m_pll)
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{
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m_pll.reset();
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m_fll.reset();
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m_costasLoop.reset();
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}
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}
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if (settings.m_fll != m_settings.m_fll || force)
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{
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if (settings.m_fll) {
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m_fll.reset();
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}
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}
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if (settings.m_costasLoop != m_settings.m_costasLoop || force)
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{
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if (settings.m_costasLoop) {
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m_costasLoop.reset();
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}
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}
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if (settings.m_pllPskOrder != m_settings.m_pllPskOrder || force)
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{
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if (settings.m_pllPskOrder < 32) {
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m_pll.setPskOrder(settings.m_pllPskOrder);
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}
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if (settings.m_pllPskOrder < 16) {
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m_costasLoop.setPskOrder(settings.m_pllPskOrder);
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}
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}
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if ((settings.m_pllBandwidth != m_settings.m_pllBandwidth)
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|| (settings.m_pllDampingFactor != m_settings.m_pllDampingFactor)
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|| (settings.m_pllLoopGain != m_settings.m_pllLoopGain)
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|| force)
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{
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m_pll.computeCoefficients(settings.m_pllBandwidth, settings.m_pllDampingFactor, settings.m_pllLoopGain);
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m_costasLoop.computeCoefficients(settings.m_pllBandwidth);
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}
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if ((settings.m_rationalDownSample != m_settings.m_rationalDownSample) ||
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(settings.m_rationalDownSamplerRate != m_settings.m_rationalDownSamplerRate) || force)
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{
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m_interpolator.create(16, m_sinkSampleRate, m_sinkSampleRate / 4.0f);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_sinkSampleRate / (Real) settings.m_rationalDownSamplerRate;
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doApplySampleRate = true;
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}
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m_settings = settings;
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if (doApplySampleRate) {
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applySampleRate();
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}
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}
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bool ChannelAnalyzerSink::isPllLocked() const
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{
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if (m_settings.m_pll)
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return m_pll.locked();
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else
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return false;
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}
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Real ChannelAnalyzerSink::getPllFrequency() const
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{
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if (m_settings.m_costasLoop)
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return m_costasLoop.getFreq();
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else if (m_settings.m_fll)
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return m_fll.getFreq();
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else if (m_settings.m_pll)
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return m_pll.getFreq();
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else
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return 0.0;
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}
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Real ChannelAnalyzerSink::getPllPhase() const
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{
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if (m_settings.m_costasLoop)
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return m_costasLoop.getPhiHat();
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else if (m_settings.m_pll)
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return m_pll.getPhiHat();
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else
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return 0.0f;
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}
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Real ChannelAnalyzerSink::getPllDeltaPhase() const
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{
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if (m_settings.m_pll)
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return m_pll.getDeltaPhi();
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else
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return 0.0f;
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}
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int ChannelAnalyzerSink::getActualSampleRate()
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{
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if (m_settings.m_rationalDownSample) {
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return m_settings.m_rationalDownSamplerRate;
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} else {
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return m_sinkSampleRate;
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}
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}
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void ChannelAnalyzerSink::applySampleRate()
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{
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int sampleRate = getActualSampleRate();
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qDebug("ChannelAnalyzerSink::applySampleRate: sampleRate: %d m_interpolatorDistance: %f", sampleRate, m_interpolatorDistance);
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setFilters(sampleRate, m_settings.m_bandwidth, m_settings.m_lowCutoff);
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m_pll.setSampleRate(sampleRate);
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m_fll.setSampleRate(sampleRate);
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m_costasLoop.setSampleRate(sampleRate);
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RRCFilter->create_rrc_filter(m_settings.m_bandwidth / (float) sampleRate, m_settings.m_rrcRolloff / 100.0);
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}
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