Implementation for a single path Stationary Jakes propagation loss model. More...

#include <jakes-process.h>

Inheritance diagram for ns3::JakesProcess:

Collaboration diagram for ns3::JakesProcess:

Classes
struct	Oscillator
	Represents a single oscillator. More...

Public Member Functions
	JakesProcess ()
virtual	~JakesProcess ()
virtual void	DoDispose ()
double	GetChannelGainDb () const
	Get Channel gain [dB].
std::complex< double >	GetComplexGain () const
void	SetPropagationLossModel (Ptr< const PropagationLossModel >)
Public Member Functions inherited from ns3::Object
	Object ()
virtual	~Object ()
void	AggregateObject (Ptr< Object > other)
void	Dispose (void)
AggregateIterator	GetAggregateIterator (void) const
virtual TypeId	GetInstanceTypeId (void) const
template<typename T >
Ptr< T >	GetObject (void) const
template<typename T >
Ptr< T >	GetObject (TypeId tid) const
void	Start (void)
Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	SimpleRefCount (const SimpleRefCount &o)
uint32_t	GetReferenceCount (void) const
SimpleRefCount &	operator= (const SimpleRefCount &o)
void	Ref (void) const
void	Unref (void) const
Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
void	GetAttribute (std::string name, AttributeValue &value) const
bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const
void	SetAttribute (std::string name, const AttributeValue &value)
bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)
	This method returns the TypeId associated to ns3::JakesProcess.

Private Member Functions
void	ConstructOscillators ()
void	SetDopplerFrequencyHz (double dopplerFrequencyHz)
void	SetNOscillators (unsigned int nOscillators)

Private Attributes
name	Attributes: \{ double m_omegaDopplerMax
Ptr< const JakesPropagationLossModel >	m_jakes
unsigned int	m_nOscillators
Ptr< UniformRandomVariable >	m_uniformVariable
Vector of	oscillators: std::vector<Oscillator> m_oscillators

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
virtual void	DoStart (void)
virtual void	NotifyNewAggregate (void)

Detailed Description

Implementation for a single path Stationary Jakes propagation loss model.

The Jakes propagation loss model implemented here is described in [1].

We consider one transmitter - receiver pair and calculate the complex coefficients for this case as follow:

$X(t)=X_c(t) + j X_s(t)$

$X_c(t) = \frac{2}{\sqrt{M}}\sum_{n=1}^{M}\cos(\psi_n)\cos(\omega_d t\cos(\alpha_n)+\phi_n)$

$X_s(t) = \frac{2}{\sqrt{M}}\sum_{n=1}^{M}\sin(\psi_n)\cos(\omega_d t\cos(\alpha_n)+\phi_n)$

with

$\alpha_n = \frac{2\pi n - \pi + \theta}{4M}, n=1,2, \ldots,M$

where $\theta$ , $\phi$ , and $\psi_n$ are statically independent and uniformly distributed over $[-\pi, \pi)$ for all $n$ .

[1] Y. R. Zheng and C. Xiao, "Simulation Models With Correct Statistical Properties for Rayleigh Fading Channel", IEEE Trans. on Communications, Vol. 51, pp 920-928, June 2003

Definition at line 55 of file jakes-process.h.

Constructor & Destructor Documentation

ns3::JakesProcess::JakesProcess ( )

Definition at line 115 of file jakes-process.cc.

ns3::JakesProcess::~JakesProcess ( )

virtual

Definition at line 121 of file jakes-process.cc.

Member Function Documentation

void ns3::JakesProcess::ConstructOscillators ( )

private

Rotation speed 1a. Initiate
$\alpha_n = \frac{2\pi n - \pi + \theta}{4M}, n=1,2, \ldots,M$
, n is oscillatorNumber, M is m_nOscillators

1b. Initiate rotation speed:

Initiate complex amplitude:

Construct oscillator:

Definition at line 92 of file jakes-process.cc.

References ns3::JakesPropagationLossModel::GetUniformRandomVariable(), ns3::UniformRandomVariable::GetValue(), m_jakes, m_nOscillators, NS_ASSERT, and ns3::JakesPropagationLossModel::PI.

Referenced by SetPropagationLossModel().

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void ns3::JakesProcess::DoDispose ( void )

virtual

This method is called by Object::Dispose or by the object's destructor, whichever comes first.

Subclasses are expected to implement their real destruction code in an overriden version of this method and chain up to their parent's implementation once they are done. i.e., for simplicity, the destructor of every subclass should be empty and its content should be moved to the associated DoDispose method.

It is safe to call GetObject from within this method.

Reimplemented from ns3::Object.

Definition at line 127 of file jakes-process.cc.

References m_jakes.

double ns3::JakesProcess::GetChannelGainDb ( ) const

Get Channel gain [dB].

Definition at line 144 of file jakes-process.cc.

References GetComplexGain().

Referenced by ns3::JakesPropagationLossModel::DoCalcRxPower().

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std::complex< double > ns3::JakesProcess::GetComplexGain ( ) const

Definition at line 133 of file jakes-process.cc.

References ns3::Now().

Referenced by GetChannelGainDb().

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TypeId ns3::JakesProcess::GetTypeId ( void )

static

This method returns the TypeId associated to ns3::JakesProcess.

Attributes defined for this type:

DopplerFrequencyHz: Corresponding doppler frequency[Hz]
- Set with class: ns3::DoubleValue
- Underlying type: double 0:10000
- Initial value: 80
- Flags: construct write
NumberOfOscillators: The number of oscillators
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 4:1000
- Initial value: 20
- Flags: construct write