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spectrum: Calculate propagation loss and receiver antenna gain at RX

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This commit is contained in:
Sébastien Deronne
2024-10-29 14:34:56 +01:00
parent 608d8b2df0
commit a7d0758dbd
2 changed files with 71 additions and 64 deletions
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133
src/spectrum/model/multi-model-spectrum-channel.cc
View File

@@ -289,6 +289,7 @@ MultiModelSpectrumChannel::StartTx(Ptr<SpectrumSignalParameters> txParams)
"SpectrumModel change was not notified to MultiModelSpectrumChannel "
"(i.e., AddRx should be called again after model is changed)");
auto txAntennaGain{0.0};
if ((*rxPhyIterator) != txParams->txPhy)
{
auto rxNetDevice = (*rxPhyIterator)->GetDevice();
@@ -320,57 +321,12 @@ MultiModelSpectrumChannel::StartTx(Ptr<SpectrumSignalParameters> txParams)
if (txMobility && receiverMobility)
{
auto txAntennaGain{0.0};
auto rxAntennaGain{0.0};
auto propagationGainDb{0.0};
auto pathLossDb{0.0};
if (rxParams->txAntenna)
{
Angles txAngles(receiverMobility->GetPosition(), txMobility->GetPosition());
txAntennaGain = rxParams->txAntenna->GetGainDb(txAngles);
NS_LOG_LOGIC("txAntennaGain = " << txAntennaGain << " dB");
pathLossDb -= txAntennaGain;
}
auto rxAntenna = DynamicCast<AntennaModel>((*rxPhyIterator)->GetAntenna());
if (rxAntenna)
{
Angles rxAngles(txMobility->GetPosition(), receiverMobility->GetPosition());
rxAntennaGain = rxAntenna->GetGainDb(rxAngles);
NS_LOG_LOGIC("rxAntennaGain = " << rxAntennaGain << " dB");
pathLossDb -= rxAntennaGain;
}
if (m_propagationLoss)
{
if (txMobility->GetPosition() == receiverMobility->GetPosition())
{
propagationGainDb = 0; // Assume no propagation loss when co-located
}
else
{
propagationGainDb =
m_propagationLoss->CalcRxPower(0, txMobility, receiverMobility);
}
NS_LOG_LOGIC("propagationGainDb = " << propagationGainDb << " dB");
pathLossDb -= propagationGainDb;
}
NS_LOG_LOGIC("total pathLoss = " << pathLossDb << " dB");
// Gain trace
m_gainTrace(txMobility,
receiverMobility,
txAntennaGain,
rxAntennaGain,
propagationGainDb,
pathLossDb);
// Pathloss trace
m_pathLossTrace(txParams->txPhy, *rxPhyIterator, pathLossDb);
if (pathLossDb > m_maxLossDb)
{
// beyond range
continue;
}
auto pathGainLinear = std::pow(10.0, (-pathLossDb) / 10.0);
*(rxParams->psd) *= pathGainLinear;
if (m_propagationDelay)
{
delay = m_propagationDelay->GetDelay(txMobility, receiverMobility);
@@ -386,6 +342,7 @@ MultiModelSpectrumChannel::StartTx(Ptr<SpectrumSignalParameters> txParams)
&MultiModelSpectrumChannel::StartRx,
this,
txParams->psd,
txAntennaGain,
rxParams,
*rxPhyIterator,
convertedPsds);
@@ -398,6 +355,7 @@ MultiModelSpectrumChannel::StartTx(Ptr<SpectrumSignalParameters> txParams)
&MultiModelSpectrumChannel::StartRx,
this,
txParams->psd,
txAntennaGain,
rxParams,
*rxPhyIterator,
convertedPsds);
@@ -410,6 +368,7 @@ MultiModelSpectrumChannel::StartTx(Ptr<SpectrumSignalParameters> txParams)
void
MultiModelSpectrumChannel::StartRx(
Ptr<SpectrumValue> txPsd,
double txAntennaGain,
Ptr<SpectrumSignalParameters> params,
Ptr<SpectrumPhy> receiver,
const std::map<SpectrumModelUid_t, Ptr<SpectrumValue>>& availableConvertedPsds)
@@ -454,29 +413,75 @@ MultiModelSpectrumChannel::StartRx(
}
}
if (m_spectrumPropagationLoss)
auto txMobility = params->txPhy->GetMobility();
auto rxMobility = receiver->GetMobility();
if (txMobility && rxMobility)
{
params->psd =
m_spectrumPropagationLoss->CalcRxPowerSpectralDensity(params,
params->txPhy->GetMobility(),
receiver->GetMobility());
}
else if (m_phasedArraySpectrumPropagationLoss)
{
auto txPhasedArrayModel = DynamicCast<PhasedArrayModel>(params->txPhy->GetAntenna());
auto rxPhasedArrayModel = DynamicCast<PhasedArrayModel>(receiver->GetAntenna());
auto pathLossDb{-txAntennaGain};
auto rxAntennaGain{0.0};
auto propagationGainDb{0.0};
NS_ASSERT_MSG(txPhasedArrayModel && rxPhasedArrayModel,
"PhasedArrayModel instances should be installed at both TX and RX "
"SpectrumPhy in order to use PhasedArraySpectrumPropagationLoss.");
if (auto rxAntenna = DynamicCast<AntennaModel>(receiver->GetAntenna()))
{
Angles rxAngles(txMobility->GetPosition(), rxMobility->GetPosition());
rxAntennaGain = rxAntenna->GetGainDb(rxAngles);
NS_LOG_LOGIC("rxAntennaGain = " << rxAntennaGain << " dB");
pathLossDb -= rxAntennaGain;
}
params = m_phasedArraySpectrumPropagationLoss->CalcRxPowerSpectralDensity(
params,
params->txPhy->GetMobility(),
receiver->GetMobility(),
txPhasedArrayModel,
rxPhasedArrayModel);
if (m_propagationLoss && (txMobility->GetPosition() != rxMobility->GetPosition()))
{
propagationGainDb = m_propagationLoss->CalcRxPower(0, txMobility, rxMobility);
NS_LOG_LOGIC("propagationGainDb = " << propagationGainDb << " dB");
pathLossDb -= propagationGainDb;
}
NS_LOG_LOGIC("total pathLoss = " << pathLossDb << " dB");
// Gain trace
m_gainTrace(txMobility,
rxMobility,
txAntennaGain,
rxAntennaGain,
propagationGainDb,
pathLossDb);
// Pathloss trace
m_pathLossTrace(params->txPhy, receiver, pathLossDb);
if (pathLossDb > m_maxLossDb)
{
// beyond range
return;
}
const auto pathLossLinear = std::pow(10.0, (-pathLossDb) / 10.0);
*(params->psd) *= pathLossLinear;
if (m_spectrumPropagationLoss)
{
params->psd = m_spectrumPropagationLoss->CalcRxPowerSpectralDensity(params,
txMobility,
rxMobility);
}
else if (m_phasedArraySpectrumPropagationLoss)
{
auto txPhasedArrayModel = DynamicCast<PhasedArrayModel>(params->txPhy->GetAntenna());
auto rxPhasedArrayModel = DynamicCast<PhasedArrayModel>(receiver->GetAntenna());
NS_ASSERT_MSG(txPhasedArrayModel && rxPhasedArrayModel,
"PhasedArrayModel instances should be installed at both TX and RX "
"SpectrumPhy in order to use PhasedArraySpectrumPropagationLoss.");
params = m_phasedArraySpectrumPropagationLoss->CalcRxPowerSpectralDensity(
params,
txMobility,
rxMobility,
txPhasedArrayModel,
rxPhasedArrayModel);
}
}
receiver->StartRx(params);
}

2
src/spectrum/model/multi-model-spectrum-channel.h
View File

@@ -130,12 +130,14 @@ class MultiModelSpectrumChannel : public SpectrumChannel
* Used internally to reschedule transmission after the propagation delay.
*
* @param txPsd The transmitted PSD.
* @param txAntennaGain The antenna gain at the transmitter.
* @param params The signal parameters.
* @param receiver A pointer to the receiver SpectrumPhy.
* @param availableConvertedPsds available converted PSDs from the TX PSD.
*/
virtual void StartRx(
Ptr<SpectrumValue> txPsd,
double txAntennaGain,
Ptr<SpectrumSignalParameters> params,
Ptr<SpectrumPhy> receiver,
const std::map<SpectrumModelUid_t, Ptr<SpectrumValue>>& availableConvertedPsds);