mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-04 14:03:51 -05:00
570 lines
20 KiB
C++
570 lines
20 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
|
|
// Copyright (C) 2021 Jon Beniston, M7RCE //
|
|
// //
|
|
// 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/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QDebug>
|
|
|
|
#include <complex.h>
|
|
|
|
#include "dsp/dspengine.h"
|
|
#include "dsp/datafifo.h"
|
|
#include "dsp/scopevis.h"
|
|
#include "util/db.h"
|
|
#include "util/stepfunctions.h"
|
|
#include "util/reedsolomon.h"
|
|
#include "maincore.h"
|
|
|
|
#include "radiosondedemod.h"
|
|
#include "radiosondedemodsink.h"
|
|
|
|
const uint8_t RadiosondeDemodSink::m_descramble[64] = {
|
|
0x96, 0x83, 0x3E, 0x51, 0xB1, 0x49, 0x08, 0x98,
|
|
0x32, 0x05, 0x59, 0x0E, 0xF9, 0x44, 0xC6, 0x26,
|
|
0x21, 0x60, 0xC2, 0xEA, 0x79, 0x5D, 0x6D, 0xA1,
|
|
0x54, 0x69, 0x47, 0x0C, 0xDC, 0xE8, 0x5C, 0xF1,
|
|
0xF7, 0x76, 0x82, 0x7F, 0x07, 0x99, 0xA2, 0x2C,
|
|
0x93, 0x7C, 0x30, 0x63, 0xF5, 0x10, 0x2E, 0x61,
|
|
0xD0, 0xBC, 0xB4, 0xB6, 0x06, 0xAA, 0xF4, 0x23,
|
|
0x78, 0x6E, 0x3B, 0xAE, 0xBF, 0x7B, 0x4C, 0xC1
|
|
};
|
|
|
|
RadiosondeDemodSink::RadiosondeDemodSink(RadiosondeDemod *radiosondeDemod) :
|
|
m_scopeSink(nullptr),
|
|
m_radiosondeDemod(radiosondeDemod),
|
|
m_channelSampleRate(RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE),
|
|
m_channelFrequencyOffset(0),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_messageQueueToChannel(nullptr),
|
|
m_rxBuf(nullptr),
|
|
m_train(nullptr),
|
|
m_sampleBufferIndex(0)
|
|
{
|
|
m_magsq = 0.0;
|
|
|
|
m_demodBuffer.resize(1<<12);
|
|
m_demodBufferFill = 0;
|
|
m_sampleBuffer.resize(m_sampleBufferSize);
|
|
|
|
applySettings(m_settings, true);
|
|
applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
|
|
}
|
|
|
|
RadiosondeDemodSink::~RadiosondeDemodSink()
|
|
{
|
|
delete[] m_rxBuf;
|
|
delete[] m_train;
|
|
}
|
|
|
|
void RadiosondeDemodSink::sampleToScope(Complex sample)
|
|
{
|
|
if (m_scopeSink)
|
|
{
|
|
Real r = std::real(sample) * SDR_RX_SCALEF;
|
|
Real i = std::imag(sample) * SDR_RX_SCALEF;
|
|
m_sampleBuffer[m_sampleBufferIndex++] = Sample(r, i);
|
|
|
|
if (m_sampleBufferIndex == m_sampleBufferSize)
|
|
{
|
|
std::vector<SampleVector::const_iterator> vbegin;
|
|
vbegin.push_back(m_sampleBuffer.begin());
|
|
m_scopeSink->feed(vbegin, m_sampleBufferSize);
|
|
m_sampleBufferIndex = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void RadiosondeDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
|
|
{
|
|
Complex ci;
|
|
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
if (m_interpolatorDistance < 1.0f) // interpolate
|
|
{
|
|
while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(ci);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
else // decimate
|
|
{
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(ci);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void RadiosondeDemodSink::processOneSample(Complex &ci)
|
|
{
|
|
// FM demodulation
|
|
double magsqRaw;
|
|
Real deviation;
|
|
Real fmDemod = m_phaseDiscri.phaseDiscriminatorDelta(ci, magsqRaw, deviation);
|
|
|
|
// Calculate average and peak levels for level meter
|
|
Real magsq = magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED);
|
|
m_movingAverage(magsq);
|
|
m_magsq = m_movingAverage.asDouble();
|
|
m_magsqSum += magsq;
|
|
if (magsq > m_magsqPeak)
|
|
{
|
|
m_magsqPeak = magsq;
|
|
}
|
|
m_magsqCount++;
|
|
|
|
// Gaussian filter
|
|
Real filt = m_pulseShape.filter(fmDemod);
|
|
|
|
// An input frequency offset corresponds to a DC offset after FM demodulation
|
|
// What frequency offset is RS41 specified too?
|
|
// We need to remove this, otherwise it may effect the sampling
|
|
// To calculate what it is, we sum the training sequence, which should be zero
|
|
|
|
// Clip, as large noise can result in high correlation
|
|
// Don't clip to 1.0 - as there may be some DC offset (1k/4.8k max dev=0.2)
|
|
Real filtClipped;
|
|
filtClipped = std::fmax(-1.4, std::fmin(1.4, filt));
|
|
|
|
// Buffer filtered samples. We buffer enough samples for a max length message
|
|
// before trying to demod, so false triggering can't make us miss anything
|
|
m_rxBuf[m_rxBufIdx] = filtClipped;
|
|
m_rxBufIdx = (m_rxBufIdx + 1) % m_rxBufLength;
|
|
m_rxBufCnt = std::min(m_rxBufCnt + 1, m_rxBufLength);
|
|
|
|
Real corr = 0.0f;
|
|
bool scopeCRCValid = false;
|
|
bool scopeCRCInvalid = false;
|
|
Real dcOffset = 0.0f;
|
|
bool thresholdMet = false;
|
|
bool gotSOP = false;
|
|
|
|
if ((m_rxBufCnt >= m_rxBufLength))
|
|
{
|
|
// Correlate with training sequence
|
|
corr = correlate(m_rxBufIdx);
|
|
|
|
// If we meet threshold, try to demod
|
|
// Take abs value, to account for both initial phases
|
|
thresholdMet = fabs(corr) >= m_settings.m_correlationThreshold;
|
|
if (thresholdMet)
|
|
{
|
|
// Try to see if starting at a later sample improves correlation
|
|
int maxCorrOffset = 0;
|
|
Real maxCorr;
|
|
do
|
|
{
|
|
maxCorr = fabs(corr);
|
|
maxCorrOffset++;
|
|
corr = correlate(m_rxBufIdx + maxCorrOffset);
|
|
}
|
|
while (fabs(corr) > maxCorr);
|
|
maxCorrOffset--;
|
|
|
|
// Calculate mean of preamble as DC offset (as it should be 0 on an ideal signal)
|
|
Real trainingSum = 0.0f;
|
|
for (int i = 0; i < m_correlationLength; i++)
|
|
{
|
|
int j = (m_rxBufIdx + maxCorrOffset + i) % m_rxBufLength;
|
|
trainingSum += m_rxBuf[j];
|
|
}
|
|
dcOffset = trainingSum/m_correlationLength;
|
|
|
|
// Start demod after (most of) preamble
|
|
int x = (m_rxBufIdx + maxCorrOffset + m_correlationLength*3/4 + 0) % m_rxBufLength;
|
|
|
|
// Attempt to demodulate
|
|
uint64_t bits = 0;
|
|
int bitCount = 0;
|
|
int byteCount = 0;
|
|
QList<int> sampleIdxs;
|
|
for (int sampleIdx = 0; sampleIdx < m_rxBufLength; sampleIdx += m_samplesPerSymbol)
|
|
{
|
|
// Sum and slice
|
|
// Summing 3 samples seems to give a very small improvement vs just using 1
|
|
int sampleCnt = 3;
|
|
int sampleOffset = -1;
|
|
Real sampleSum = 0.0f;
|
|
for (int i = 0; i < sampleCnt; i++) {
|
|
sampleSum += m_rxBuf[(x + sampleOffset + i) % m_rxBufLength] - dcOffset;
|
|
sampleIdxs.append((x + sampleOffset + i) % m_rxBufLength);
|
|
}
|
|
int symbol = sampleSum >= 0.0f ? 1 : 0;
|
|
|
|
// Move to next symbol
|
|
x = (x + m_samplesPerSymbol) % m_rxBufLength;
|
|
|
|
// Symbols map directly to bits
|
|
int bit = symbol;
|
|
|
|
// Store in shift reg (little endian)
|
|
bits |= ((uint64_t)bit) << bitCount;
|
|
bitCount++;
|
|
|
|
if (gotSOP)
|
|
{
|
|
if (bitCount == 8)
|
|
{
|
|
// Got a complete byte
|
|
m_bytes[byteCount] = bits;
|
|
byteCount++;
|
|
bits = 0;
|
|
bitCount = 0;
|
|
|
|
if (byteCount >= RS41_LENGTH_STD)
|
|
{
|
|
// Get expected length of frame
|
|
uint8_t frameType = m_bytes[RS41_OFFSET_FRAME_TYPE] ^ m_descramble[RS41_OFFSET_FRAME_TYPE];
|
|
int length = RS41Frame::getFrameLength(frameType);
|
|
|
|
// Have we received a complete frame?
|
|
if (byteCount == length)
|
|
{
|
|
bool ok = processFrame(length, corr, sampleIdx);
|
|
scopeCRCValid = ok;
|
|
scopeCRCInvalid = !ok;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (bits == 0xf812962211cab610ULL) // Scrambled header
|
|
{
|
|
// Start of packet
|
|
gotSOP = true;
|
|
bits = 0;
|
|
bitCount = 0;
|
|
m_bytes[0] = 0x10;
|
|
m_bytes[1] = 0xb6;
|
|
m_bytes[2] = 0xca;
|
|
m_bytes[3] = 0x11;
|
|
m_bytes[4] = 0x22;
|
|
m_bytes[5] = 0x96;
|
|
m_bytes[6] = 0x12;
|
|
m_bytes[7] = 0xf8;
|
|
byteCount = 8;
|
|
}
|
|
else
|
|
{
|
|
if (bitCount == 64)
|
|
{
|
|
bits >>= 1;
|
|
bitCount--;
|
|
}
|
|
if (sampleIdx >= 16 * 8 * m_samplesPerSymbol)
|
|
{
|
|
// Too many bits without receving header
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// printf("\n");
|
|
}
|
|
}
|
|
|
|
// Select signals to feed to scope
|
|
Complex scopeSample;
|
|
switch (m_settings.m_scopeCh1)
|
|
{
|
|
case 0:
|
|
scopeSample.real(ci.real() / SDR_RX_SCALEF);
|
|
break;
|
|
case 1:
|
|
scopeSample.real(ci.imag() / SDR_RX_SCALEF);
|
|
break;
|
|
case 2:
|
|
scopeSample.real(magsq);
|
|
break;
|
|
case 3:
|
|
scopeSample.real(fmDemod);
|
|
break;
|
|
case 4:
|
|
scopeSample.real(filt);
|
|
break;
|
|
case 5:
|
|
scopeSample.real(m_rxBuf[m_rxBufIdx]);
|
|
break;
|
|
case 6:
|
|
scopeSample.real(corr / 100.0);
|
|
break;
|
|
case 7:
|
|
scopeSample.real(thresholdMet);
|
|
break;
|
|
case 8:
|
|
scopeSample.real(gotSOP);
|
|
break;
|
|
case 9:
|
|
scopeSample.real(dcOffset);
|
|
break;
|
|
case 10:
|
|
scopeSample.real(scopeCRCValid ? 1.0 : (scopeCRCInvalid ? -1.0 : 0));
|
|
break;
|
|
}
|
|
switch (m_settings.m_scopeCh2)
|
|
{
|
|
case 0:
|
|
scopeSample.imag(ci.real() / SDR_RX_SCALEF);
|
|
break;
|
|
case 1:
|
|
scopeSample.imag(ci.imag() / SDR_RX_SCALEF);
|
|
break;
|
|
case 2:
|
|
scopeSample.imag(magsq);
|
|
break;
|
|
case 3:
|
|
scopeSample.imag(fmDemod);
|
|
break;
|
|
case 4:
|
|
scopeSample.imag(filt);
|
|
break;
|
|
case 5:
|
|
scopeSample.imag(m_rxBuf[m_rxBufIdx]);
|
|
break;
|
|
case 6:
|
|
scopeSample.imag(corr / 100.0);
|
|
break;
|
|
case 7:
|
|
scopeSample.imag(thresholdMet);
|
|
break;
|
|
case 8:
|
|
scopeSample.imag(gotSOP);
|
|
break;
|
|
case 9:
|
|
scopeSample.imag(dcOffset);
|
|
break;
|
|
case 10:
|
|
scopeSample.imag(scopeCRCValid ? 1.0 : (scopeCRCInvalid ? -1.0 : 0));
|
|
break;
|
|
}
|
|
sampleToScope(scopeSample);
|
|
|
|
// Send demod signal to Demod Analzyer feature
|
|
m_demodBuffer[m_demodBufferFill++] = fmDemod * std::numeric_limits<int16_t>::max();
|
|
|
|
if (m_demodBufferFill >= m_demodBuffer.size())
|
|
{
|
|
QList<ObjectPipe*> dataPipes;
|
|
MainCore::instance()->getDataPipes().getDataPipes(m_channel, "demod", dataPipes);
|
|
|
|
if (dataPipes.size() > 0)
|
|
{
|
|
QList<ObjectPipe*>::iterator it = dataPipes.begin();
|
|
|
|
for (; it != dataPipes.end(); ++it)
|
|
{
|
|
DataFifo *fifo = qobject_cast<DataFifo*>((*it)->m_element);
|
|
|
|
if (fifo) {
|
|
fifo->write((quint8*) &m_demodBuffer[0], m_demodBuffer.size() * sizeof(qint16), DataFifo::DataTypeI16);
|
|
}
|
|
}
|
|
}
|
|
|
|
m_demodBufferFill = 0;
|
|
}
|
|
}
|
|
|
|
// Correlate received signal with training sequence
|
|
// Note that DC offset doesn't matter for this
|
|
Real RadiosondeDemodSink::correlate(int idx) const
|
|
{
|
|
Real corr = 0.0f;
|
|
for (int i = 0; i < m_correlationLength; i++)
|
|
{
|
|
int j = (idx + i) % m_rxBufLength;
|
|
corr += m_train[i] * m_rxBuf[j];
|
|
}
|
|
return corr;
|
|
}
|
|
|
|
bool RadiosondeDemodSink::processFrame(int length, float corr, int sampleIdx)
|
|
{
|
|
// Descramble
|
|
for (int i = 0; i < length; i++) {
|
|
m_bytes[i] = m_bytes[i] ^ m_descramble[i & 0x3f];
|
|
}
|
|
|
|
// Reed-Solomon Error Correction
|
|
int errorsCorrected = reedSolomonErrorCorrection();
|
|
if (errorsCorrected >= 0)
|
|
{
|
|
// Check per-block CRCs are correct
|
|
if (checkCRCs(length))
|
|
{
|
|
if (getMessageQueueToChannel())
|
|
{
|
|
QByteArray rxPacket((char *)m_bytes, length);
|
|
RadiosondeDemod::MsgMessage *msg = RadiosondeDemod::MsgMessage::create(rxPacket, errorsCorrected, corr);
|
|
getMessageQueueToChannel()->push(msg);
|
|
}
|
|
|
|
// Skip over received packet, so we don't try to re-demodulate it
|
|
m_rxBufCnt -= sampleIdx;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Reed Solomon error correction
|
|
// Returns number of errors corrected, or -1 if there are uncorrectable errors
|
|
int RadiosondeDemodSink::reedSolomonErrorCorrection()
|
|
{
|
|
ReedSolomon::RS<RS41_RS_N,RS41_RS_K> rs;
|
|
int errorsCorrected = 0;
|
|
|
|
for (int i = 0; (i < RS41_RS_INTERLEAVE) && (errorsCorrected >= 0); i++)
|
|
{
|
|
// Deinterleave and reverse order
|
|
uint8_t rsData[RS41_RS_N];
|
|
|
|
memset(rsData, 0, RS41_RS_PAD);
|
|
for (int j = 0; j < RS41_RS_DATA; j++) {
|
|
rsData[RS41_RS_K-1-j] = m_bytes[RS41_OFFSET_FRAME_TYPE+j*RS41_RS_INTERLEAVE+i];
|
|
}
|
|
for (int j = 0; j < RS41_RS_2T; j++) {
|
|
rsData[RS41_RS_N-1-j] = m_bytes[RS41_OFFSET_RS+i*RS41_RS_2T+j];
|
|
}
|
|
|
|
// Detect and correct errors
|
|
int errors = rs.decode(&rsData[0], RS41_RS_K); // FIXME: Indicate 0 padding?
|
|
if (errors >= 0) {
|
|
errorsCorrected += errors;
|
|
} else {
|
|
// Uncorrectable errors
|
|
return -1;
|
|
}
|
|
|
|
// Restore corrected data
|
|
for (int j = 0; j < RS41_RS_DATA; j++) {
|
|
m_bytes[RS41_OFFSET_FRAME_TYPE+j*RS41_RS_INTERLEAVE+i] = rsData[RS41_RS_K-1-j];
|
|
}
|
|
|
|
}
|
|
return errorsCorrected;
|
|
}
|
|
|
|
// Check per-block CRCs
|
|
// We could pass partial frames that have some correct CRCs, but for now, whole frame has to be correct
|
|
bool RadiosondeDemodSink::checkCRCs(int length)
|
|
{
|
|
for (int i = RS41_OFFSET_BLOCK_0; i < length; )
|
|
{
|
|
uint8_t blockLength = m_bytes[i+1];
|
|
uint16_t rxCrc = m_bytes[i+2+blockLength] | (m_bytes[i+2+blockLength+1] << 8);
|
|
// CRC doesn't include ID/len - so these can be wrong
|
|
m_crc.init();
|
|
m_crc.calculate(&m_bytes[i+2], blockLength);
|
|
uint16_t calcCrc = m_crc.get();
|
|
if (calcCrc != rxCrc) {
|
|
return false;
|
|
}
|
|
i += blockLength+4;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void RadiosondeDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
|
|
{
|
|
qDebug() << "RadiosondeDemodSink::applyChannelSettings:"
|
|
<< " channelSampleRate: " << channelSampleRate
|
|
<< " channelFrequencyOffset: " << channelFrequencyOffset;
|
|
|
|
if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
|
|
(m_channelSampleRate != channelSampleRate) || force)
|
|
{
|
|
m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
|
|
}
|
|
|
|
if ((m_channelSampleRate != channelSampleRate) || force)
|
|
{
|
|
m_interpolator.create(16, channelSampleRate, m_settings.m_rfBandwidth / 2.2);
|
|
m_interpolatorDistance = (Real) channelSampleRate / (Real) RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE;
|
|
m_interpolatorDistanceRemain = m_interpolatorDistance;
|
|
}
|
|
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_channelFrequencyOffset = channelFrequencyOffset;
|
|
m_samplesPerSymbol = RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE / m_settings.m_baud;
|
|
qDebug() << "RadiosondeDemodSink::applyChannelSettings: m_samplesPerSymbol: " << m_samplesPerSymbol;
|
|
}
|
|
|
|
void RadiosondeDemodSink::applySettings(const RadiosondeDemodSettings& settings, bool force)
|
|
{
|
|
qDebug() << "RadiosondeDemodSink::applySettings:"
|
|
<< " force: " << force;
|
|
|
|
if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force)
|
|
{
|
|
m_interpolator.create(16, m_channelSampleRate, settings.m_rfBandwidth / 2.2);
|
|
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE;
|
|
m_interpolatorDistanceRemain = m_interpolatorDistance;
|
|
m_lowpass.create(301, RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE, settings.m_rfBandwidth / 2.0f);
|
|
}
|
|
if ((settings.m_fmDeviation != m_settings.m_fmDeviation) || force)
|
|
{
|
|
m_phaseDiscri.setFMScaling(RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE / (2.0f * settings.m_fmDeviation));
|
|
}
|
|
|
|
if ((settings.m_baud != m_settings.m_baud) || force)
|
|
{
|
|
m_samplesPerSymbol = RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE / settings.m_baud;
|
|
qDebug() << "RadiosondeDemodSink::applySettings: m_samplesPerSymbol: " << m_samplesPerSymbol << " baud " << settings.m_baud;
|
|
|
|
// What value to use for BT? RFIC is Si4032 - its datasheet only appears to support 0.5
|
|
m_pulseShape.create(0.5, 3, m_samplesPerSymbol);
|
|
|
|
// Recieve buffer, long enough for one max length message
|
|
delete[] m_rxBuf;
|
|
m_rxBufLength = RADIOSONDEDEMOD_MAX_BYTES*8*m_samplesPerSymbol;
|
|
m_rxBuf = new Real[m_rxBufLength];
|
|
m_rxBufIdx = 0;
|
|
m_rxBufCnt = 0;
|
|
|
|
// Create training sequence for correlation
|
|
delete[] m_train;
|
|
|
|
const int correlateBits = 200; // Preamble is 320bits - leave some for AGC (and clock recovery eventually)
|
|
m_correlationLength = correlateBits*m_samplesPerSymbol; // Don't want to use header, as we want to calculate DC offset
|
|
m_train = new Real[m_correlationLength]();
|
|
|
|
// Pulse shape filter takes a few symbols before outputting expected shape
|
|
for (int j = 0; j < m_samplesPerSymbol; j++) {
|
|
m_pulseShape.filter(-1.0f);
|
|
}
|
|
for (int j = 0; j < m_samplesPerSymbol; j++) {
|
|
m_pulseShape.filter(1.0f);
|
|
}
|
|
for (int i = 0; i < correlateBits; i++)
|
|
{
|
|
for (int j = 0; j < m_samplesPerSymbol; j++) {
|
|
m_train[i*m_samplesPerSymbol+j] = -m_pulseShape.filter((i&1) * 2.0f - 1.0f);
|
|
}
|
|
}
|
|
}
|
|
|
|
m_settings = settings;
|
|
}
|