FreeSpace Class Reference

This computes the received signal strength using the Friis free space model. More...

#include <path_loss.hpp>

Inheritance diagram for FreeSpace:


Public Types
typedef boost::shared_ptr< FreeSpace >	FreeSpacePtr
	Smart pointer that clients should use.
Public Member Functions
virtual double	getRecvdStrength (const WirelessCommSignal &signal, const PhysicalLayer &receiver) const
	Compute the signal strength for the signal at the receiver.
Static Public Member Functions
static FreeSpacePtr	create ()
	A factory method to ensure that all objects are created via `new` since we are using smart pointers.
static FreeSpacePtr	create (double lossFactor)
	A factory method to ensure that all objects are created via `new` since we are using smart pointers.
Protected Member Functions
	FreeSpace ()
	A constructor.
	FreeSpace (double lossFactor)
	A constructor.
Protected Attributes
double	m_lossFactor
	The multiplier for how much signal loss a signal experiences.
Static Protected Attributes
static const double	m_DEFAULT_LOSS_FACTOR = 1.0
	The default loss factor.

Detailed Description

This computes the received signal strength using the Friis free space model.

The equation for the model * is given by:

$P_r = \frac{P_t G_t G_r \lambda^2}{(4\pi)^2 d^2 L}$

where $P_r$ is the receiver power, $P_t$ is the transmitted power, $G_t$ and $G_r$ are the gains of the transmitter and receiver antennas, respectively, $\lambda$ is the wavelength, $d$ is the distance between the transmitter and receiver, and $L$ is the loss factor.