Shadowing Class Reference

#include <shadowing.h>

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Public Member Functions
	Shadowing ()
	~Shadowing ()
virtual double	Pr (PacketStamp *tx, PacketStamp *rx, WirelessPhy *ifp)
virtual int	command (int argc, const char *const *argv)
virtual double	Pr (PacketStamp *tx, PacketStamp *rx, Phy *)
double	Friis (double Pt, double Gt, double Gr, double lambda, double L, double d)
Protected Attributes
RNG *	ranVar
double	pathlossExp_
double	std_db_
double	dist0_
int	seed_
char *	name
Topography *	topo

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Constructor & Destructor Documentation

Shadowing::Shadowing (   )

Definition at line 48 of file shadowing.cc. References dist0_, pathlossExp_, RNG::PREDEF_SEED_SOURCE, ranVar, seed_, RNG::set_seed(), and std_db_. { bind("pathlossExp_", &pathlossExp_); bind("std_db_", &std_db_); bind("dist0_", &dist0_); bind("seed_", &seed_); ranVar = new RNG; ranVar->set_seed(RNG::PREDEF_SEED_SOURCE, seed_); }

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Shadowing::~Shadowing (   )

Definition at line 60 of file shadowing.cc. References ranVar. { delete ranVar; }

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Member Function Documentation

int Shadowing::command (  int  argc, const char *const *  argv )  [virtual]

Reimplemented from Propagation. Definition at line 111 of file shadowing.cc. References Propagation::command(), RNG::HEURISTIC_SEED_SOURCE, RNG::PREDEF_SEED_SOURCE, ranVar, RNG::RAW_SEED_SOURCE, and RNG::set_seed(). { if (argc == 4) { if (strcmp(argv[1], "seed") == 0) { int s = atoi(argv[3]); if (strcmp(argv[2], "raw") == 0) { ranVar->set_seed(RNG::RAW_SEED_SOURCE, s); } else if (strcmp(argv[2], "predef") == 0) { ranVar->set_seed(RNG::PREDEF_SEED_SOURCE, s); // s is the index in predefined seed array // 0 <= s < 64 } else if (strcmp(argv[2], "heuristic") == 0) { ranVar->set_seed(RNG::HEURISTIC_SEED_SOURCE, 0); } return(TCL_OK); } } return Propagation::command(argc, argv); }

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double Propagation::Friis (  double  Pt, double  Gt, double  Gr, double  lambda, double  L, double  d )  [inherited]

Definition at line 92 of file propagation.cc. References M, and PI. Referenced by TwoRayGround::Pr(), Pr(), and FreeSpace::Pr(). { /* * Friis free space equation: * * Pt * Gt * Gr * (lambda^2) * P = -------------------------- * (4 * pi * d)^2 * L */ double M = lambda / (4 * PI * d); return (Pt * Gt * Gr * (M * M)) / L; }

double Propagation::Pr (  PacketStamp *  tx, PacketStamp *  rx, Phy *  )  [virtual, inherited]

Definition at line 72 of file propagation.cc. References abort(), and Propagation::name. Referenced by WirelessPhy::sendUp(). { fprintf(stderr,"Propagation model %s not implemented for generic NetIF\n", name); abort(); return 0; // Make msvc happy }

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double Shadowing::Pr (  PacketStamp *  tx, PacketStamp *  rx, WirelessPhy *  ifp )  [virtual]

Reimplemented from Propagation. Definition at line 66 of file shadowing.cc. References dist0_, Propagation::Friis(), PacketStamp::getAntenna(), WirelessPhy::getL(), WirelessPhy::getLambda(), MobileNode::getLoc(), PacketStamp::getNode(), Antenna::getRxGain(), Antenna::getTxGain(), PacketStamp::getTxPr(), Antenna::getX(), Antenna::getY(), Antenna::getZ(), RNG::normal(), pathlossExp_, pow(), Pr(), ranVar, and std_db_. Referenced by Pr(), and ShadowingVis::Pr(). { double L = ifp->getL(); // system loss double lambda = ifp->getLambda(); // wavelength double Xt, Yt, Zt; // loc of transmitter double Xr, Yr, Zr; // loc of receiver t->getNode()->getLoc(&Xt, &Yt, &Zt); r->getNode()->getLoc(&Xr, &Yr, &Zr); // Is antenna position relative to node position? Xr += r->getAntenna()->getX(); Yr += r->getAntenna()->getY(); Zr += r->getAntenna()->getZ(); Xt += t->getAntenna()->getX(); Yt += t->getAntenna()->getY(); Zt += t->getAntenna()->getZ(); double dX = Xr - Xt; double dY = Yr - Yt; double dZ = Zr - Zt; double dist = sqrt(dX * dX + dY * dY + dZ * dZ); // get antenna gain double Gt = t->getAntenna()->getTxGain(dX, dY, dZ, lambda); double Gr = r->getAntenna()->getRxGain(dX, dY, dZ, lambda); // calculate receiving power at reference distance double Pr0 = Friis(t->getTxPr(), Gt, Gr, lambda, L, dist0_); // calculate average power loss predicted by path loss model double avg_db = -10.0 * pathlossExp_ * log10(dist/dist0_); // get power loss by adding a log-normal random variable (shadowing) // the power loss is relative to that at reference distance dist0_ double powerLoss_db = avg_db + ranVar->normal(0.0, std_db_); // calculate the receiving power at dist double Pr = Pr0 * pow(10.0, powerLoss_db/10.0); return Pr; }

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Member Data Documentation

double Shadowing::dist0_ [protected]

Definition at line 46 of file shadowing.h. Referenced by Pr(), and Shadowing().

char* Propagation::name [protected, inherited]

Definition at line 90 of file propagation.h. Referenced by Propagation::Pr(), and Propagation::Propagation().

double Shadowing::pathlossExp_ [protected]

Definition at line 44 of file shadowing.h. Referenced by Pr(), and Shadowing().

RNG* Shadowing::ranVar [protected]

Definition at line 42 of file shadowing.h. Referenced by command(), Pr(), Shadowing(), and ~Shadowing().

int Shadowing::seed_ [protected]

Definition at line 47 of file shadowing.h. Referenced by Shadowing().

double Shadowing::std_db_ [protected]

Definition at line 45 of file shadowing.h. Referenced by Pr(), and Shadowing().

Topography* Propagation::topo [protected, inherited]

Definition at line 91 of file propagation.h. Referenced by Propagation::command(), and Propagation::Propagation().

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The documentation for this class was generated from the following files:

• shadowing.h
• shadowing.cc

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