A Discrete-Event Network Simulator
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friis-spectrum-propagation-loss.cc
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1/*
2 * Copyright (c) 2009 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: Nicola Baldo <nbaldo@cttc.es>
18 */
19
21
23
24#include <ns3/mobility-model.h>
25
26#include <cmath> // for M_PI
27
28namespace ns3
29{
30
31NS_OBJECT_ENSURE_REGISTERED(FriisSpectrumPropagationLossModel);
32
34{
35}
36
38{
39}
40
43{
44 static TypeId tid = TypeId("ns3::FriisSpectrumPropagationLossModel")
46 .SetGroupName("Spectrum")
47 .AddConstructor<FriisSpectrumPropagationLossModel>();
48 return tid;
49}
50
56{
57 Ptr<SpectrumValue> rxPsd = Copy<SpectrumValue>(params->psd);
58 auto vit = rxPsd->ValuesBegin();
59 auto fit = rxPsd->ConstBandsBegin();
60
61 NS_ASSERT(a);
62 NS_ASSERT(b);
63
64 double d = a->GetDistanceFrom(b);
65
66 while (vit != rxPsd->ValuesEnd())
67 {
68 NS_ASSERT(fit != rxPsd->ConstBandsEnd());
69 *vit /= CalculateLoss(fit->fc, d); // Prx = Ptx / loss
70 ++vit;
71 ++fit;
72 }
73 return rxPsd;
74}
75
76double
78{
79 NS_ASSERT(d >= 0);
80
81 if (d == 0)
82 {
83 return 1;
84 }
85
86 NS_ASSERT(f > 0);
87 double loss_sqrt = (4 * M_PI * f * d) / 3e8;
88 double loss = loss_sqrt * loss_sqrt;
89
90 if (loss < 1)
91 {
92 loss = 1;
93 }
94 return loss;
95}
96
97int64_t
99{
100 return 0;
101}
102
103} // namespace ns3
Friis spectrum propagation loss model.
double CalculateLoss(double f, double d) const
Return the propagation loss L according to a simplified version of Friis' formula in which antenna ga...
Ptr< SpectrumValue > DoCalcRxPowerSpectralDensity(Ptr< const SpectrumSignalParameters > params, Ptr< const MobilityModel > a, Ptr< const MobilityModel > b) const override
int64_t DoAssignStreams(int64_t stream) override
Assign a fixed random variable stream number to the random variables used by this model.
Smart pointer class similar to boost::intrusive_ptr.
Definition: ptr.h:77
spectrum-aware propagation loss model
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:932
#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_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.