Ejemplo n.º 1
0
bool RadioInterface::driveReceiveRadio()
{
  radioVector *burst = NULL;

  if (!mOn)
    return false;

  pullBuffer();

  GSM::Time rcvClock = mClock.get();
  rcvClock.decTN(receiveOffset);
  unsigned tN = rcvClock.TN();
  int recvSz = recvBuffer[0]->getAvailSamples();
  const int symbolsPerSlot = gSlotLen + 8;
  int burstSize;

  if (mSPSRx == 4)
    burstSize = 625;
  else
    burstSize = symbolsPerSlot + (tN % 4 == 0);

  /* 
   * Pre-allocate head room for the largest correlation size
   * so we can later avoid a re-allocation and copy
   * */
  size_t head = GSM::gRACHSynchSequence.size();

  /*
   * Form receive bursts and pass up to transceiver. Use repeating
   * pattern of 157-156-156-156 symbols per timeslot
   */
  while (recvSz > burstSize) {
    for (size_t i = 0; i < mChans; i++) {
      burst = new radioVector(rcvClock, burstSize, head, mMIMO);

      for (size_t n = 0; n < mMIMO; n++)
        unRadioifyVector(burst->getVector(n), i);

      if (mReceiveFIFO[i].size() < 32)
        mReceiveFIFO[i].write(burst);
      else
        delete burst;
    }

    mClock.incTN();
    rcvClock.incTN();
    recvSz -= burstSize;

    tN = rcvClock.TN();

    if (mSPSRx != 4)
      burstSize = (symbolsPerSlot + (tN % 4 == 0)) * mSPSRx;
  }

  return true;
}
Ejemplo n.º 2
0
void RadioInterface::driveReceiveRadio() {

  if (!mOn) return;

  if (mReceiveFIFO.size() > 8) return;

  pullBuffer();

  GSM::Time rcvClock = mClock.get();
  rcvClock.decTN(receiveOffset);
  unsigned tN = rcvClock.TN();
  int rcvSz = rcvCursor/2;
  int readSz = 0;
  const int symbolsPerSlot = gSlotLen + 8;

  // while there's enough data in receive buffer, form received 
  //    GSM bursts and pass up to Transceiver
  // Using the 157-156-156-156 symbols per timeslot format.
  while (rcvSz > (symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol) {
    signalVector rxVector((symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol);
    unRadioifyVector(rcvBuffer+readSz*2,rxVector);

    GSM::Time tmpTime = rcvClock;
    if (rcvClock.FN() >= 0) {
      //LOG(DEBUG) << "FN: " << rcvClock.FN();
      int dummyARFCN = 0;
      radioVector *rxBurst = NULL;
      if (!loadTest)
        rxBurst = new radioVector(rxVector,tmpTime,dummyARFCN);
      else {
	if (tN % 4 == 0)
	  rxBurst = new radioVector(*finalVec9,tmpTime,dummyARFCN);
        else
          rxBurst = new radioVector(*finalVec,tmpTime,dummyARFCN); 
      }
      mReceiveFIFO.put(rxBurst); 
    }
    mClock.incTN(); 
    rcvClock.incTN();
    //if (mReceiveFIFO.size() >= 16) mReceiveFIFO.wait(8);
    //LOG(DEBUG) << "receiveFIFO: wrote radio vector at time: " << mClock.get() << ", new size: " << mReceiveFIFO.size() ;
    readSz += (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
    rcvSz -= (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;


    tN = rcvClock.TN();
  }

  if (readSz > 0) { 
    memcpy(rcvBuffer,rcvBuffer+2*readSz,sizeof(short)*2*(rcvCursor/2-readSz));
    rcvCursor = rcvCursor-2*readSz;
  }
} 
Ejemplo n.º 3
0
void RadioInterface::driveReceiveRadio() {
  pullBuffer();

  if (!rcvBuffer) {
    return;}

  GSM::Time rcvClock = mClock.get();
  rcvClock.decTN(receiveOffset);
  unsigned tN = rcvClock.TN();
  int rcvSz = rcvBuffer->size();
  int readSz = 0;
  const int symbolsPerSlot = gSlotLen + 8;

  // while there's enough data in receive buffer, form received 
  //    GSM bursts and pass up to Transceiver
  // Using the 157-156-156-156 symbols per timeslot format.
  while (rcvSz > (symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol) {
    signalVector rxVector(rcvBuffer->begin(),
			  readSz,
			  (symbolsPerSlot + (tN % 4 == 0))*samplesPerSymbol);
    GSM::Time tmpTime = rcvClock;
    if (rcvClock.FN() >= 0) {
      LOG(DEEPDEBUG) << "FN: " << rcvClock.FN();
      radioVector* rxBurst = new radioVector(rxVector,tmpTime);
      mReceiveFIFO.write(rxBurst);
    }
    mClock.incTN(); 
    rcvClock.incTN();
    if (mReceiveFIFO.size() >= 16) mReceiveFIFO.wait(8);

    LOG(DEEPDEBUG) << "receiveFIFO: wrote radio vector at time: " << mClock.get() << ", new size: " << mReceiveFIFO.size() ;
    readSz += (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;
    rcvSz -= (symbolsPerSlot+(tN % 4 == 0))*samplesPerSymbol;

    tN = rcvClock.TN();
  }
  
  signalVector *tmp = new signalVector(rcvBuffer->size()-readSz);
  rcvBuffer->segmentCopyTo(*tmp,readSz,tmp->size());
  delete rcvBuffer;
  rcvBuffer = tmp;

} 
Ejemplo n.º 4
0
double Clock::systime(const GSM::Time& when) const
{
	ScopedLock lock(mLock);
	const double slotMicroseconds = (48.0 / 13e6) * 156.25;
	const double frameMicroseconds = slotMicroseconds * 8.0;
	int32_t elapsedFrames = when.FN() - mBaseFN;
	if (elapsedFrames<0) elapsedFrames += gHyperframe;
	double elapsedUSec = elapsedFrames * frameMicroseconds + when.TN() * slotMicroseconds;
	double baseSeconds = mBaseTime.sec() + mBaseTime.usec()*1e-6;
	double st = baseSeconds + 1e-6*elapsedUSec;
	return st;
}
Ejemplo n.º 5
0
bool RadioInterface::driveReceiveRadio()
{
  radioVector *burst = NULL;

  if (!mOn)
    return false;

  pullBuffer();

  GSM::Time rcvClock = mClock.get();
  rcvClock.decTN(receiveOffset);
  unsigned tN = rcvClock.TN();
  int recvSz = recvCursor;
  int readSz = 0;
  const int symbolsPerSlot = gSlotLen + 8;
  int burstSize = (symbolsPerSlot + (tN % 4 == 0)) * mSPSRx;

  /* 
   * Pre-allocate head room for the largest correlation size
   * so we can later avoid a re-allocation and copy
   * */
  size_t head = GSM::gRACHSynchSequence.size();

  /*
   * Form receive bursts and pass up to transceiver. Use repeating
   * pattern of 157-156-156-156 symbols per timeslot
   */
  while (recvSz > burstSize) {
    for (size_t i = 0; i < mChans; i++) {
      burst = new radioVector(rcvClock, burstSize, head, mMIMO);

      for (size_t n = 0; n < mMIMO; n++) {
        unRadioifyVector((float *)
                         (recvBuffer[mMIMO * i + n]->begin() + readSz),
                         *burst->getVector(n));
      }

      if (mReceiveFIFO[i].size() < 32)
        mReceiveFIFO[i].write(burst);
      else
        delete burst;
    }

    mClock.incTN();
    rcvClock.incTN();
    readSz += burstSize;
    recvSz -= burstSize;

    tN = rcvClock.TN();

    burstSize = (symbolsPerSlot + (tN % 4 == 0)) * mSPSRx;
  }

  if (readSz > 0) {
    for (size_t i = 0; i < recvBuffer.size(); i++) {
      memmove(recvBuffer[i]->begin(),
              recvBuffer[i]->begin() + readSz,
              (recvCursor - readSz) * 2 * sizeof(float));
    }

    recvCursor -= readSz;
  }

  return true;
}