kopia lustrzana https://github.com/f4exb/sdrangel
599 wiersze
18 KiB
C++
599 wiersze
18 KiB
C++
#include <QDebug>
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#include <QString>
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#include "M17Demodulator.h"
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namespace modemm17 {
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// const std::array<float, 150> M17Demodulator::rrc_taps = std::array<float, 150>{
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// 0.0029364388513841593, 0.0031468394550958484, 0.002699564567597445, 0.001661182944400927, 0.00023319405581230247,
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// -0.0012851320781224025, -0.0025577136087664687, -0.0032843366522956313, -0.0032697038088887226, -0.0024733964729590865,
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// -0.0010285696910973807, 0.0007766690889758685, 0.002553421969211845, 0.0038920145144327816, 0.004451886520053017,
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// 0.00404219185231544, 0.002674727068399207, 0.0005756567993179152, -0.0018493784971116507, -0.004092346891623224,
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// -0.005648131453822014, -0.006126925416243605, -0.005349511529163396, -0.003403189203405097, -0.0006430502751187517,
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// 0.002365929161655135, 0.004957956568090113, 0.006506845894531803, 0.006569574194782443, 0.0050017573119839134,
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// 0.002017321931508163, -0.0018256054303579805, -0.00571615173291049, -0.008746639552588416, -0.010105075751866371,
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// -0.009265784007800534, -0.006136551625729697, -0.001125978562075172, 0.004891777252042491, 0.01071805138282269,
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// 0.01505751553351295, 0.01679337935001369, 0.015256245142156299, 0.01042830577908502, 0.003031522725559901,
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// -0.0055333532968188165, -0.013403099825723372, -0.018598682349642525, -0.01944761739590459, -0.015005271935951746,
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// -0.0053887880354343935, 0.008056525910253532, 0.022816244158307273, 0.035513467692208076, 0.04244131815783876,
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// 0.04025481153629372, 0.02671818654865632, 0.0013810216516704976, -0.03394615682795165, -0.07502635967975885,
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// -0.11540977897637611, -0.14703962203941534, -0.16119995609538576, -0.14969512896336504, -0.10610329539459686,
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// -0.026921412469634916, 0.08757875030779196, 0.23293327870303457, 0.4006012210123992, 0.5786324696325503,
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// 0.7528286479934068, 0.908262741447522, 1.0309661131633199, 1.1095611856548013, 1.1366197723675815,
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// 1.1095611856548013, 1.0309661131633199, 0.908262741447522, 0.7528286479934068, 0.5786324696325503,
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// 0.4006012210123992, 0.23293327870303457, 0.08757875030779196, -0.026921412469634916, -0.10610329539459686,
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// -0.14969512896336504, -0.16119995609538576, -0.14703962203941534, -0.11540977897637611, -0.07502635967975885,
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// -0.03394615682795165, 0.0013810216516704976, 0.02671818654865632, 0.04025481153629372, 0.04244131815783876,
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// 0.035513467692208076, 0.022816244158307273, 0.008056525910253532, -0.0053887880354343935, -0.015005271935951746,
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// -0.01944761739590459, -0.018598682349642525, -0.013403099825723372, -0.0055333532968188165, 0.003031522725559901,
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// 0.01042830577908502, 0.015256245142156299, 0.01679337935001369, 0.01505751553351295, 0.01071805138282269,
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// 0.004891777252042491, -0.001125978562075172, -0.006136551625729697, -0.009265784007800534, -0.010105075751866371,
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// -0.008746639552588416, -0.00571615173291049, -0.0018256054303579805, 0.002017321931508163, 0.0050017573119839134,
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// 0.006569574194782443, 0.006506845894531803, 0.004957956568090113, 0.002365929161655135, -0.0006430502751187517,
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// -0.003403189203405097, -0.005349511529163396, -0.006126925416243605, -0.005648131453822014, -0.004092346891623224,
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// -0.0018493784971116507, 0.0005756567993179152, 0.002674727068399207, 0.00404219185231544, 0.004451886520053017,
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// 0.0038920145144327816, 0.002553421969211845, 0.0007766690889758685, -0.0010285696910973807, -0.0024733964729590865,
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// -0.0032697038088887226, -0.0032843366522956313, -0.0025577136087664687, -0.0012851320781224025, 0.00023319405581230247,
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// 0.001661182944400927, 0.002699564567597445, 0.0031468394550958484, 0.0029364388513841593, 0.0
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// };
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// Generated using scikit-commpy N = 150, aplha = 0.5, Ts = 1/4800 s, Fs = 48000 Hz
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const std::array<float, 150> M17Demodulator::rrc_taps = std::array<float, 150>{
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-8.434122e-04, +3.898184e-04, +1.628891e-03, +2.576674e-03, +2.987740e-03,
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+2.729505e-03, +1.820181e-03, +4.333001e-04, -1.134215e-03, -2.525029e-03,
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-3.402452e-03, -3.531573e-03, -2.841363e-03, -1.451929e-03, +3.417005e-04,
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+2.128236e-03, +3.470212e-03, +4.006361e-03, +3.543024e-03, +2.112321e-03,
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-1.893023e-05, -2.395144e-03, -4.465932e-03, -5.709548e-03, -5.759027e-03,
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-4.501582e-03, -2.125844e-03, +8.982825e-04, +3.907892e-03, +6.188389e-03,
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+7.139194e-03, +6.427125e-03, +4.090469e-03, +5.649447e-04, -3.381677e-03,
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-6.799652e-03, -8.765190e-03, -8.603529e-03, -6.076811e-03, -1.489520e-03,
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+4.321674e-03, +1.012385e-02, +1.453219e-02, +1.631886e-02, +1.472302e-02,
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+9.691259e-03, +1.984723e-03, -6.888307e-03, -1.492227e-02, -2.001531e-02,
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-2.045303e-02, -1.538011e-02, -5.154591e-03, +8.509368e-03, +2.267330e-02,
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+3.359618e-02, +3.740502e-02, +3.091849e-02, +1.248579e-02, -1.731807e-02,
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-5.529141e-02, -9.561492e-02, -1.303248e-01, -1.502279e-01, -1.461577e-01,
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-1.104008e-01, -3.808012e-02, +7.173159e-02, +2.153664e-01, +3.845237e-01,
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+5.668902e-01, +7.473693e-01, +9.097718e-01, +1.038746e+00, +1.121677e+00,
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+1.150282e+00, +1.121677e+00, +1.038746e+00, +9.097718e-01, +7.473693e-01,
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+5.668902e-01, +3.845237e-01, +2.153664e-01, +7.173159e-02, -3.808012e-02,
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-1.104008e-01, -1.461577e-01, -1.502279e-01, -1.303248e-01, -9.561492e-02,
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-5.529141e-02, -1.731807e-02, +1.248579e-02, +3.091849e-02, +3.740502e-02,
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+3.359618e-02, +2.267330e-02, +8.509368e-03, -5.154591e-03, -1.538011e-02,
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-2.045303e-02, -2.001531e-02, -1.492227e-02, -6.888307e-03, +1.984723e-03,
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+9.691259e-03, +1.472302e-02, +1.631886e-02, +1.453219e-02, +1.012385e-02,
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+4.321674e-03, -1.489520e-03, -6.076811e-03, -8.603529e-03, -8.765190e-03,
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-6.799652e-03, -3.381677e-03, +5.649447e-04, +4.090469e-03, +6.427125e-03,
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+7.139194e-03, +6.188389e-03, +3.907892e-03, +8.982825e-04, -2.125844e-03,
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-4.501582e-03, -5.759027e-03, -5.709548e-03, -4.465932e-03, -2.395144e-03,
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-1.893023e-05, +2.112321e-03, +3.543024e-03, +4.006361e-03, +3.470212e-03,
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+2.128236e-03, +3.417005e-04, -1.451929e-03, -2.841363e-03, -3.531573e-03,
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-3.402452e-03, -2.525029e-03, -1.134215e-03, +4.333001e-04, +1.820181e-03,
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+2.729505e-03, +2.987740e-03, +2.576674e-03, +1.628891e-03, +3.898184e-04,
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};
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void M17Demodulator::update_values(uint8_t index)
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{
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correlator.apply([this](float t){dev.sample(t);}, index);
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dev.update();
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sync_sample_index = index;
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}
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void M17Demodulator::dcd_on()
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{
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// Data carrier newly detected.
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dcd_ = true;
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sync_count = 0;
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missing_sync_count = 0;
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dev.reset();
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framer.reset();
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decoder.reset();
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}
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void M17Demodulator::dcd_off()
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{
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// Just lost data carrier.
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dcd_ = false;
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demodState = DemodState::UNLOCKED;
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decoder.reset();
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if (diagnostic_callback)
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{
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diagnostic_callback(
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dcd_,
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dev.error(),
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dev.deviation(),
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dev.offset(),
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(int) demodState,
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(int) sync_word_type,
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clock_recovery.clock_estimate(),
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sample_index,
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sync_sample_index,
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clock_recovery.sample_index(),
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-1
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);
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}
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}
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void M17Demodulator::initialize(const float input)
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{
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auto filtered_sample = demod_filter(input);
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correlator.sample(filtered_sample);
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}
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void M17Demodulator::update_dcd()
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{
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if (!dcd_ && dcd.dcd())
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{
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// fputs("\nAOS\n", stderr);
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dcd_on();
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need_clock_reset_ = true;
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}
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else if (dcd_ && !dcd.dcd())
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{
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// fputs("\nLOS\n", stderr);
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dcd_off();
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}
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}
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void M17Demodulator::do_unlocked()
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{
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// We expect to find the preamble immediately after DCD.
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if (missing_sync_count < 1920)
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{
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missing_sync_count += 1;
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auto sync_index = preamble_sync(correlator);
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auto sync_updated = preamble_sync.updated();
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if (sync_updated)
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{
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sync_count = 0;
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missing_sync_count = 0;
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need_clock_reset_ = true;
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dev.reset();
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update_values(sync_index);
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sample_index = sync_index;
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demodState = DemodState::LSF_SYNC;
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}
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return;
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}
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auto sync_index = lsf_sync(correlator);
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auto sync_updated = lsf_sync.updated();
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if (sync_updated)
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{
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sync_count = 0;
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missing_sync_count = 0;
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need_clock_reset_ = true;
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dev.reset();
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update_values(sync_index);
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sample_index = sync_index;
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demodState = DemodState::FRAME;
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if (sync_updated < 0) {
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sync_word_type = M17FrameDecoder::SyncWordType::STREAM;
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} else {
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sync_word_type = M17FrameDecoder::SyncWordType::LSF;
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}
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return;
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}
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sync_index = packet_sync(correlator);
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sync_updated = packet_sync.updated();
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if (sync_updated < 0)
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{
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sync_count = 0;
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missing_sync_count = 0;
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need_clock_reset_ = true;
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dev.reset();
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update_values(sync_index);
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sample_index = sync_index;
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demodState = DemodState::FRAME;
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sync_word_type = M17FrameDecoder::SyncWordType::BERT;
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}
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}
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/**
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* Check for LSF sync word. We only enter the DemodState::LSF_SYNC state
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* if a preamble sync has been detected, which also means that sample_index
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* has been initialized to a sane value for the baseband.
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*/
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void M17Demodulator::do_lsf_sync()
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{
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float sync_triggered = 0.;
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float bert_triggered = 0.;
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if (correlator.index() == sample_index)
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{
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sync_triggered = preamble_sync.triggered(correlator);
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if (sync_triggered > 0.1) {
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return;
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}
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sync_triggered = lsf_sync.triggered(correlator);
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bert_triggered = packet_sync.triggered(correlator);
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if (sync_triggered != 0) {
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: sync_triggered:" << sync_triggered;
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}
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if (bert_triggered != 0) {
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: bert_triggered:" << bert_triggered;
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}
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if (bert_triggered < 0)
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{
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missing_sync_count = 0;
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need_clock_update_ = true;
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update_values(sample_index);
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demodState = DemodState::FRAME;
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sync_word_type = M17FrameDecoder::SyncWordType::BERT;
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: BERT:" << (int) sync_word_type;
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}
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else if (bert_triggered > 0)
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{
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missing_sync_count = 0;
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need_clock_update_ = true;
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update_values(sample_index);
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demodState = DemodState::FRAME;
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sync_word_type = M17FrameDecoder::SyncWordType::PACKET;
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: PACKET:" << (int) sync_word_type;
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}
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else if (std::abs(sync_triggered) > 0.1)
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{
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missing_sync_count = 0;
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need_clock_update_ = true;
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update_values(sample_index);
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if (sync_triggered > 0)
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{
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demodState = DemodState::FRAME;
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sync_word_type = M17FrameDecoder::SyncWordType::LSF;
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: LSF:" << (int) sync_word_type;
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}
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else
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{
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demodState = DemodState::FRAME;
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sync_word_type = M17FrameDecoder::SyncWordType::STREAM;
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: STREAM:" << (int) sync_word_type;
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}
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}
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else if (++missing_sync_count > 192)
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{
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demodState = DemodState::UNLOCKED;
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decoder.reset();
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missing_sync_count = 0;
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qDebug() << "modemm17::M17Demodulator::do_lsf_sync: UNLOCKED:" << (int) sync_word_type;
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}
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else
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{
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update_values(sample_index);
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}
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}
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}
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/**
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* Check for a stream sync word (LSF sync word that is maximally negative).
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* We can enter DemodState::STREAM_SYNC from either a valid LSF decode for
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* an audio stream, or from a stream frame decode.
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*
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*/
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void M17Demodulator::do_stream_sync()
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{
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uint8_t sync_index = lsf_sync(correlator);
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int8_t sync_updated = lsf_sync.updated();
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sync_count += 1;
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if (sync_updated < 0) // Stream sync word
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{
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missing_sync_count = 0;
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if (sync_count > 70)
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{
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update_values(sync_index);
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sync_word_type = M17FrameDecoder::SyncWordType::STREAM;
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demodState = DemodState::FRAME;
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}
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return;
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}
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else if (sync_count > 87)
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{
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update_values(sync_index);
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missing_sync_count += 1;
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if (missing_sync_count < MAX_MISSING_SYNC)
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{
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sync_word_type = M17FrameDecoder::SyncWordType::STREAM;
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demodState = DemodState::FRAME;
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}
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else
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{
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// fputs("\n!SYNC\n", stderr);
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demodState = DemodState::LSF_SYNC;
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}
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}
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}
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/**
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* Check for a packet sync word. DemodState::PACKET_SYNC can only be
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* entered from a valid LSF frame decode with the data/packet type bit set.
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*/
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void M17Demodulator::do_packet_sync()
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{
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auto sync_index = packet_sync(correlator);
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auto sync_updated = packet_sync.updated();
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sync_count += 1;
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if (sync_count > 70 && sync_updated)
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{
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missing_sync_count = 0;
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update_values(sync_index);
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sync_word_type = M17FrameDecoder::SyncWordType::PACKET;
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demodState = DemodState::FRAME;
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}
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else if (sync_count > 87)
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{
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missing_sync_count += 1;
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if (missing_sync_count < MAX_MISSING_SYNC)
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{
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sync_word_type = M17FrameDecoder::SyncWordType::PACKET;
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demodState = DemodState::FRAME;
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}
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else
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{
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demodState = DemodState::UNLOCKED;
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decoder.reset();
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}
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}
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}
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/**
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* Check for a bert sync word.
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*/
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void M17Demodulator::do_bert_sync()
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{
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auto sync_index = packet_sync(correlator);
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auto sync_updated = packet_sync.updated();
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sync_count += 1;
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if (sync_count > 70 && sync_updated < 0)
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{
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missing_sync_count = 0;
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update_values(sync_index);
|
|
sync_word_type = M17FrameDecoder::SyncWordType::BERT;
|
|
demodState = DemodState::FRAME;
|
|
}
|
|
else if (sync_count > 87)
|
|
{
|
|
missing_sync_count += 1;
|
|
|
|
if (missing_sync_count < MAX_MISSING_SYNC)
|
|
{
|
|
sync_word_type = M17FrameDecoder::SyncWordType::BERT;
|
|
demodState = DemodState::FRAME;
|
|
}
|
|
else
|
|
{
|
|
demodState = DemodState::UNLOCKED;
|
|
decoder.reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void M17Demodulator::do_frame(float filtered_sample)
|
|
{
|
|
if (correlator.index() != sample_index) {
|
|
return;
|
|
}
|
|
|
|
static uint8_t cost_count = 0;
|
|
auto sample = filtered_sample - dev.offset();
|
|
sample *= dev.idev();
|
|
sample *= polarity;
|
|
auto n = llr<4>(sample);
|
|
int8_t* tmp;
|
|
auto len = framer(n, &tmp);
|
|
|
|
if (len != 0)
|
|
{
|
|
need_clock_update_ = true;
|
|
M17FrameDecoder::input_buffer_t buffer;
|
|
std::copy(tmp, tmp + len, buffer.begin());
|
|
auto valid = decoder(sync_word_type, buffer, viterbi_cost);
|
|
cost_count = viterbi_cost > 90 ? cost_count + 1 : 0;
|
|
cost_count = viterbi_cost > 100 ? cost_count + 1 : cost_count;
|
|
cost_count = viterbi_cost > 110 ? cost_count + 1 : cost_count;
|
|
// qDebug() << "modemm17::M17Demodulator::do_frame: "
|
|
// << "sync_word_type:" << (int) sync_word_type
|
|
// << " len:" << len
|
|
// << " viterbi_cost: " << viterbi_cost
|
|
// << " cost_count" << cost_count;
|
|
|
|
if (cost_count > 75)
|
|
{
|
|
cost_count = 0;
|
|
demodState = DemodState::UNLOCKED;
|
|
decoder.reset();
|
|
// fputs("\nCOST\n", stderr);
|
|
return;
|
|
}
|
|
|
|
switch (decoder.state())
|
|
{
|
|
case M17FrameDecoder::State::STREAM:
|
|
demodState = DemodState::STREAM_SYNC;
|
|
break;
|
|
case M17FrameDecoder::State::LSF:
|
|
// If state == LSF, we need to recover LSF from LICH.
|
|
demodState = DemodState::STREAM_SYNC;
|
|
break;
|
|
case M17FrameDecoder::State::BERT:
|
|
demodState = DemodState::BERT_SYNC;
|
|
break;
|
|
default:
|
|
demodState = DemodState::PACKET_SYNC;
|
|
break;
|
|
}
|
|
|
|
sync_count = 0;
|
|
|
|
switch (valid)
|
|
{
|
|
case M17FrameDecoder::DecodeResult::FAIL:
|
|
break;
|
|
case M17FrameDecoder::DecodeResult::EOS:
|
|
demodState = DemodState::LSF_SYNC;
|
|
break;
|
|
case M17FrameDecoder::DecodeResult::OK:
|
|
break;
|
|
case M17FrameDecoder::DecodeResult::INCOMPLETE:
|
|
break;
|
|
case M17FrameDecoder::DecodeResult::PACKET_INCOMPLETE:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void M17Demodulator::operator()(const float input)
|
|
{
|
|
count_++;
|
|
dcd(input);
|
|
|
|
// We need to pump a few ms of data through on startup to initialize
|
|
// the demodulator.
|
|
if (initializing_count_)
|
|
{
|
|
--initializing_count_;
|
|
initialize(input);
|
|
count_ = 0;
|
|
return;
|
|
}
|
|
|
|
if (!dcd_)
|
|
{
|
|
if (count_ % (BLOCK_SIZE * 2) == 0)
|
|
{
|
|
update_dcd();
|
|
dcd.update();
|
|
|
|
if (diagnostic_callback)
|
|
{
|
|
diagnostic_callback(
|
|
dcd_,
|
|
dev.error(),
|
|
dev.deviation(),
|
|
dev.offset(),
|
|
(int) demodState,
|
|
(int) sync_word_type,
|
|
clock_recovery.clock_estimate(),
|
|
sample_index,
|
|
sync_sample_index,
|
|
clock_recovery.sample_index(),
|
|
viterbi_cost
|
|
);
|
|
}
|
|
|
|
count_ = 0;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
auto filtered_sample = demod_filter(input);
|
|
correlator.sample(filtered_sample);
|
|
|
|
if (correlator.index() == 0)
|
|
{
|
|
if (need_clock_reset_)
|
|
{
|
|
clock_recovery.reset();
|
|
need_clock_reset_ = false;
|
|
}
|
|
else if (need_clock_update_) // must avoid update immediately after reset.
|
|
{
|
|
clock_recovery.update();
|
|
uint8_t clock_index = clock_recovery.sample_index();
|
|
uint8_t clock_diff = std::abs(sample_index - clock_index);
|
|
uint8_t sync_diff = std::abs(sample_index - sync_sample_index);
|
|
bool clock_diff_ok = clock_diff <= 1 || clock_diff == 9;
|
|
bool sync_diff_ok = sync_diff <= 1 || sync_diff == 9;
|
|
|
|
if (clock_diff_ok) {
|
|
sample_index = clock_index;
|
|
} else if (sync_diff_ok) {
|
|
sample_index = sync_sample_index;
|
|
}
|
|
|
|
// else unchanged.
|
|
need_clock_update_ = false;
|
|
}
|
|
}
|
|
|
|
clock_recovery(filtered_sample);
|
|
|
|
if (demodState != DemodState::UNLOCKED && correlator.index() == sample_index) {
|
|
dev.sample(filtered_sample);
|
|
}
|
|
|
|
switch (demodState)
|
|
{
|
|
case DemodState::UNLOCKED:
|
|
// In this state, the sample_index is unknown. We need to find
|
|
// a sync word to find the proper sample_index. We only leave
|
|
// this state if we believe that we have a valid sample_index.
|
|
do_unlocked();
|
|
break;
|
|
case DemodState::LSF_SYNC:
|
|
do_lsf_sync();
|
|
break;
|
|
case DemodState::STREAM_SYNC:
|
|
do_stream_sync();
|
|
break;
|
|
case DemodState::PACKET_SYNC:
|
|
do_packet_sync();
|
|
break;
|
|
case DemodState::BERT_SYNC:
|
|
do_bert_sync();
|
|
break;
|
|
case DemodState::FRAME:
|
|
do_frame(filtered_sample);
|
|
break;
|
|
}
|
|
|
|
if (count_ % (BLOCK_SIZE * 5) == 0)
|
|
{
|
|
update_dcd();
|
|
count_ = 0;
|
|
|
|
if (diagnostic_callback)
|
|
{
|
|
diagnostic_callback(
|
|
dcd_,
|
|
dev.error(),
|
|
dev.deviation(),
|
|
dev.offset(),
|
|
(int) demodState,
|
|
(int) sync_word_type,
|
|
clock_recovery.clock_estimate(),
|
|
sample_index,
|
|
sync_sample_index,
|
|
clock_recovery.sample_index(),
|
|
viterbi_cost
|
|
);
|
|
}
|
|
|
|
dcd.update();
|
|
}
|
|
}
|
|
|
|
} // modemm17
|