A Discrete-Event Network Simulator
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friis-spectrum-propagation-loss.cc
Go to the documentation of this file.
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/*
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* Copyright (c) 2009 CTTC
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Nicola Baldo <nbaldo@cttc.es>
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*/
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#include "
friis-spectrum-propagation-loss.h
"
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#include "
spectrum-signal-parameters.h
"
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#include <ns3/mobility-model.h>
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#include <cmath>
// for M_PI
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namespace
ns3
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{
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NS_OBJECT_ENSURE_REGISTERED
(FriisSpectrumPropagationLossModel);
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FriisSpectrumPropagationLossModel::FriisSpectrumPropagationLossModel
()
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{
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}
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FriisSpectrumPropagationLossModel::~FriisSpectrumPropagationLossModel
()
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{
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}
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TypeId
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FriisSpectrumPropagationLossModel::GetTypeId
()
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{
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static
TypeId
tid =
TypeId
(
"ns3::FriisSpectrumPropagationLossModel"
)
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.
SetParent
<
SpectrumPropagationLossModel
>()
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.SetGroupName(
"Spectrum"
)
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.AddConstructor<
FriisSpectrumPropagationLossModel
>();
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return
tid;
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}
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Ptr<SpectrumValue>
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FriisSpectrumPropagationLossModel::DoCalcRxPowerSpectralDensity
(
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Ptr<const SpectrumSignalParameters>
params,
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Ptr<const MobilityModel>
a,
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Ptr<const MobilityModel>
b)
const
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{
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Ptr<SpectrumValue>
rxPsd =
Copy<SpectrumValue>
(params->psd);
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auto
vit = rxPsd->ValuesBegin();
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auto
fit = rxPsd->ConstBandsBegin();
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NS_ASSERT
(a);
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NS_ASSERT
(b);
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double
d = a->GetDistanceFrom(b);
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while
(vit != rxPsd->ValuesEnd())
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{
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NS_ASSERT
(fit != rxPsd->ConstBandsEnd());
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*vit /=
CalculateLoss
(fit->fc, d);
// Prx = Ptx / loss
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++vit;
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++fit;
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}
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return
rxPsd;
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}
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double
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FriisSpectrumPropagationLossModel::CalculateLoss
(
double
f,
double
d)
const
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{
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NS_ASSERT
(d >= 0);
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if
(d == 0)
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{
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return
1;
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}
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NS_ASSERT
(f > 0);
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double
loss_sqrt = (4 * M_PI * f * d) / 3e8;
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double
loss = loss_sqrt * loss_sqrt;
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if
(loss < 1)
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{
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loss = 1;
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}
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return
loss;
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}
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int64_t
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FriisSpectrumPropagationLossModel::DoAssignStreams
(int64_t stream)
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{
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return
0;
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}
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}
// namespace ns3
ns3::FriisSpectrumPropagationLossModel
Friis spectrum propagation loss model.
Definition
friis-spectrum-propagation-loss.h:32
ns3::FriisSpectrumPropagationLossModel::GetTypeId
static TypeId GetTypeId()
Get the type ID.
Definition
friis-spectrum-propagation-loss.cc:31
ns3::FriisSpectrumPropagationLossModel::CalculateLoss
double CalculateLoss(double f, double d) const
Return the propagation loss L according to a simplified version of Friis' formula in which antenna ga...
Definition
friis-spectrum-propagation-loss.cc:66
ns3::FriisSpectrumPropagationLossModel::DoCalcRxPowerSpectralDensity
Ptr< SpectrumValue > DoCalcRxPowerSpectralDensity(Ptr< const SpectrumSignalParameters > params, Ptr< const MobilityModel > a, Ptr< const MobilityModel > b) const override
Definition
friis-spectrum-propagation-loss.cc:41
ns3::FriisSpectrumPropagationLossModel::~FriisSpectrumPropagationLossModel
~FriisSpectrumPropagationLossModel() override
Definition
friis-spectrum-propagation-loss.cc:26
ns3::FriisSpectrumPropagationLossModel::DoAssignStreams
int64_t DoAssignStreams(int64_t stream) override
Assign a fixed random variable stream number to the random variables used by this model.
Definition
friis-spectrum-propagation-loss.cc:87
ns3::FriisSpectrumPropagationLossModel::FriisSpectrumPropagationLossModel
FriisSpectrumPropagationLossModel()
Definition
friis-spectrum-propagation-loss.cc:22
ns3::Ptr
Smart pointer class similar to boost::intrusive_ptr.
Definition
mpi-test-fixtures.h:37
ns3::SpectrumPropagationLossModel
spectrum-aware propagation loss model
Definition
spectrum-propagation-loss-model.h:33
ns3::TypeId
a unique identifier for an interface.
Definition
type-id.h:48
ns3::TypeId::SetParent
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition
type-id.cc:1001
friis-spectrum-propagation-loss.h
NS_ASSERT
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file,...
Definition
assert.h:55
NS_OBJECT_ENSURE_REGISTERED
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition
object-base.h:35
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
ns3::Copy
Ptr< T > Copy(Ptr< T > object)
Return a deep copy of a Ptr.
Definition
ptr.h:604
spectrum-signal-parameters.h
src
spectrum
model
friis-spectrum-propagation-loss.cc
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