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PropagationLossModel::GetRxPower -> PropagationLossModel::GetLoss

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This commit is contained in:
Federico Maguolo
2008-03-21 04:49:23 +01:00
parent 752658119f
commit 73ea5d6192
4 changed files with 32 additions and 42 deletions
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2
samples/main-propagation-loss.cc
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@@ -41,7 +41,7 @@ PrintOne (double minTxpower, double maxTxpower, double stepTxpower, double min,
std::cout << x << " ";
for (double txpower = minTxpower; txpower < maxTxpower; txpower += stepTxpower)
{
double rxPowerDbm = model->GetRxPower (txpower, a, b);
double rxPowerDbm = txpower + model->GetLoss (a, b);
std::cout << rxPowerDbm << " ";
}
std::cout << std::endl;

47
src/devices/wifi/propagation-loss-model.cc
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@@ -54,13 +54,12 @@ RandomPropagationLossModel::~RandomPropagationLossModel ()
{}
double
RandomPropagationLossModel::GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
RandomPropagationLossModel::GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
{
double rxPower = txPowerDbm - m_variable.GetValue ();
NS_LOG_DEBUG ("tx power="<<txPowerDbm<<"dbm, rx power="<<rxPower<<"Dbm");
return rxPower;
double rxc = -m_variable.GetValue ();
NS_LOG_DEBUG ("attenuation coefficent="<<rxc<<"Db");
return rxc;
}
TypeId
@@ -131,18 +130,17 @@ FriisPropagationLossModel::DbmFromW (double w) const
double
FriisPropagationLossModel::GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
FriisPropagationLossModel::GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
{
/*
* Friis free space equation:
* where Pt, Gr, Gr and P are in Watt units
* L is in meter units.
*
* Gt * Gr * (lambda^2)
* P = Pt ---------------------
* (4 * pi * d)^2 * L
* P Gt * Gr * (lambda^2)
* --- = ---------------------
* Pt (4 * pi * d)^2 * L
*
* Gt: tx gain (unit-less)
* Gr: rx gain (unit-less)
@@ -167,14 +165,13 @@ FriisPropagationLossModel::GetRxPower (double txPowerDbm,
double distance = a->GetDistanceFrom (b);
if (distance <= m_minDistance)
{
return txPowerDbm;
return 0.0;
}
double numerator = m_lambda * m_lambda;
double denominator = 16 * PI * PI * distance * distance * m_systemLoss;
double pr = 10 * log10 (numerator / denominator);
double rxPowerDbm = txPowerDbm + pr;
NS_LOG_DEBUG ("distance="<<distance<<"m, tx power="<<txPowerDbm<<"dbm, rx power="<<rxPowerDbm<<"dbm");
return rxPowerDbm;
NS_LOG_DEBUG ("distance="<<distance<<"m, attenuation coefficient="<<pr<<"dB");
return pr;
}
TypeId
@@ -228,14 +225,13 @@ LogDistancePropagationLossModel::GetPathLossExponent (void) const
}
double
LogDistancePropagationLossModel::GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
LogDistancePropagationLossModel::GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
{
double distance = a->GetDistanceFrom (b);
if (distance <= m_referenceDistance)
{
return txPowerDbm;
return 0.0;
}
/**
* The formula is:
@@ -257,13 +253,12 @@ LogDistancePropagationLossModel::GetRxPower (double txPowerDbm,
static Ptr<StaticMobilityModel> reference =
CreateObject<StaticMobilityModel> ("Position",
Vector (m_referenceDistance, 0.0, 0.0));
double rx0 = m_reference->GetRxPower (txPowerDbm, zero, reference);
double ref = m_reference->GetLoss (zero, reference);
double pathLossDb = 10 * m_exponent * log10 (distance / m_referenceDistance);
double rxPowerDbm = rx0 - pathLossDb;
NS_LOG_DEBUG ("distance="<<distance<<"m, tx-power="<<txPowerDbm<<"dbm, "<<
"reference-rx-power="<<rx0<<"dbm, "<<
"rx-power="<<rxPowerDbm<<"dbm");
return rxPowerDbm;
double rxc = ref - pathLossDb;
NS_LOG_DEBUG ("distance="<<distance<<"m, reference-attenuation="<<ref<<"dB, "<<
"attenuation coefficient="<<rxc<<"dbm");
return rxc;
}
} // namespace ns3

23
src/devices/wifi/propagation-loss-model.h
View File

@@ -38,14 +38,12 @@ class PropagationLossModel : public Object
public:
virtual ~PropagationLossModel ();
/**
* \param txPowerDbm the tx power
* \param a the mobility model of the source
* \param b the mobility model of the destination
* \returns the receive power (dbm)
* \returns the attenuation coefficient (dB)
*/
virtual double GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const = 0;
virtual double GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const = 0;
};
/**
@@ -59,9 +57,8 @@ public:
RandomPropagationLossModel ();
virtual ~RandomPropagationLossModel ();
virtual double GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
virtual double GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
private:
RandomVariable m_variable;
};
@@ -143,9 +140,8 @@ public:
*/
double GetSystemLoss (void) const;
virtual double GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
virtual double GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
private:
double DbmToW (double dbm) const;
double DbmFromW (double w) const;
@@ -197,9 +193,8 @@ public:
void SetReferenceDistance (double referenceDistance);
virtual double GetRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
virtual double GetLoss (Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const;
private:
static Ptr<PropagationLossModel> CreateDefaultReference (void);

2
src/devices/wifi/wifi-channel.cc
View File

@@ -93,7 +93,7 @@ WifiChannel::Send (Ptr<WifiPhy> sender, Ptr<const Packet> packet, double txPower
{
Ptr<MobilityModel> receiverMobility = i->first->GetNode ()->GetObject<MobilityModel> ();
Time delay = m_delay->GetDelay (senderMobility, receiverMobility);
double rxPowerDbm = m_loss->GetRxPower (txPowerDbm, senderMobility, receiverMobility);
double rxPowerDbm = txPowerDbm + m_loss->GetLoss (senderMobility, receiverMobility);
NS_LOG_DEBUG ("propagation: txPower="<<txPowerDbm<<"dbm, rxPower="<<rxPowerDbm<<"dbm, "<<
"distance="<<senderMobility->GetDistanceFrom (receiverMobility)<<"m, delay="<<delay);
Ptr<Packet> copy = packet->Copy ();