A Discrete-Event Network Simulator
API
itu-r-1411-los-propagation-loss-model.cc
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1 /*
2  * Copyright (c) 2011, 2012 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation;
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16  *
17  * Author: Marco Miozzo <marco.miozzo@cttc.es>,
18  * Nicola Baldo <nbaldo@cttc.es>
19  *
20  */
22 
23 #include "ns3/double.h"
24 #include "ns3/enum.h"
25 #include "ns3/log.h"
26 #include "ns3/mobility-model.h"
27 
28 #include <cmath>
29 
30 namespace ns3
31 {
32 
33 NS_LOG_COMPONENT_DEFINE("ItuR1411LosPropagationLossModel");
34 
35 NS_OBJECT_ENSURE_REGISTERED(ItuR1411LosPropagationLossModel);
36 
37 TypeId
39 {
40  static TypeId tid =
41  TypeId("ns3::ItuR1411LosPropagationLossModel")
43  .SetGroupName("Propagation")
44  .AddConstructor<ItuR1411LosPropagationLossModel>()
45  .AddAttribute("Frequency",
46  "The propagation frequency in Hz",
47  DoubleValue(2160e6),
49  MakeDoubleChecker<double>());
50 
51  return tid;
52 }
53 
56 {
57 }
58 
60 {
61 }
62 
63 double
65 {
66  NS_LOG_FUNCTION(this);
67  double dist = a->GetDistanceFrom(b);
68  double lossLow = 0.0;
69  double lossUp = 0.0;
70  NS_ASSERT_MSG(a->GetPosition().z > 0 && b->GetPosition().z > 0,
71  "nodes' height must be greater than 0");
72  double Lbp = std::fabs(20 * std::log10((m_lambda * m_lambda) /
73  (8 * M_PI * a->GetPosition().z * b->GetPosition().z)));
74  double Rbp = (4 * a->GetPosition().z * b->GetPosition().z) / m_lambda;
75  NS_LOG_LOGIC(this << " Lbp " << Lbp << " Rbp " << Rbp << " lambda " << m_lambda);
76  if (dist <= Rbp)
77  {
78  lossLow = Lbp + 20 * std::log10(dist / Rbp);
79  lossUp = Lbp + 20 + 25 * std::log10(dist / Rbp);
80  }
81  else
82  {
83  lossLow = Lbp + 40 * std::log10(dist / Rbp);
84  lossUp = Lbp + 20 + 40 * std::log10(dist / Rbp);
85  }
86 
87  double loss = (lossUp + lossLow) / 2;
88 
89  return loss;
90 }
91 
92 void
94 {
95  NS_ASSERT(freq > 0.0);
96  m_lambda = 299792458.0 / freq;
97 }
98 
99 double
102  Ptr<MobilityModel> b) const
103 {
104  return (txPowerDbm - GetLoss(a, b));
105 }
106 
107 int64_t
109 {
110  return 0;
111 }
112 } // namespace ns3
This class can be used to hold variables of floating point type such as 'double' or 'float'.
Definition: double.h:42
int64_t DoAssignStreams(int64_t stream) override
Assign a fixed random variable stream number to the random variables used by this model.
void SetFrequency(double freq)
Set the operating frequency.
double GetLoss(Ptr< MobilityModel > a, Ptr< MobilityModel > b) const
double DoCalcRxPower(double txPowerDbm, Ptr< MobilityModel > a, Ptr< MobilityModel > b) const override
PropagationLossModel.
double GetDistanceFrom(Ptr< const MobilityModel > position) const
Vector GetPosition() const
Models the propagation loss through a transmission medium.
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:931
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file,...
Definition: assert.h:66
#define NS_ASSERT_MSG(condition, message)
At runtime, in debugging builds, if this condition is not true, the program prints the message to out...
Definition: assert.h:86
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:202
#define NS_LOG_LOGIC(msg)
Use NS_LOG to output a message of level LOG_LOGIC.
Definition: log.h:282
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:46
Every class exported by the ns3 library is enclosed in the ns3 namespace.
Ptr< const AttributeAccessor > MakeDoubleAccessor(T1 a1)
Definition: double.h:43