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constant-spectrum-propagation-loss.cc
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1 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Author: Manuel Requena <manuel.requena@cttc.es>
19  */
20 
21 #include <math.h>
22 
23 #include "ns3/log.h"
24 
25 #include "ns3/constant-spectrum-propagation-loss.h"
26 #include "ns3/double.h"
27 
28 
29 NS_LOG_COMPONENT_DEFINE ("ConstantSpectrumPropagationLossModel");
30 
31 namespace ns3 {
32 
33 
34 NS_OBJECT_ENSURE_REGISTERED (ConstantSpectrumPropagationLossModel);
35 
36 ConstantSpectrumPropagationLossModel::ConstantSpectrumPropagationLossModel ()
37 {
38  NS_LOG_FUNCTION (this);
39 }
40 
41 ConstantSpectrumPropagationLossModel::~ConstantSpectrumPropagationLossModel ()
42 {
43  NS_LOG_FUNCTION (this);
44 }
45 
46 TypeId
47 ConstantSpectrumPropagationLossModel::GetTypeId (void)
48 {
49  static TypeId tid = TypeId ("ns3::ConstantSpectrumPropagationLossModel")
50  .SetParent<SpectrumPropagationLossModel> ()
51  .AddConstructor<ConstantSpectrumPropagationLossModel> ()
52  .AddAttribute ("Loss",
53  "Path loss (dB) between transmitter and receiver",
54  DoubleValue (1.0),
55  MakeDoubleAccessor (&ConstantSpectrumPropagationLossModel::SetLossDb,
56  &ConstantSpectrumPropagationLossModel::GetLossDb),
57  MakeDoubleChecker<double> ())
58  ;
59  return tid;
60 }
61 
62 
63 void
64 ConstantSpectrumPropagationLossModel::SetLossDb (double lossDb)
65 {
66  NS_LOG_FUNCTION (this);
67  m_lossDb = lossDb;
68  m_lossLinear = pow (10, m_lossDb / 10);
69 }
70 
71 
72 double
73 ConstantSpectrumPropagationLossModel::GetLossDb () const
74 {
75  NS_LOG_FUNCTION (this);
76  return m_lossDb;
77 }
78 
79 
80 Ptr<SpectrumValue>
81 ConstantSpectrumPropagationLossModel::DoCalcRxPowerSpectralDensity (Ptr<const SpectrumValue> txPsd,
82  Ptr<const MobilityModel> a,
83  Ptr<const MobilityModel> b) const
84 {
85  NS_LOG_FUNCTION (this);
86 
87  Ptr<SpectrumValue> rxPsd = Copy<SpectrumValue> (txPsd);
88  Values::iterator vit = rxPsd->ValuesBegin ();
89  Bands::const_iterator fit = rxPsd->ConstBandsBegin ();
90 
91  while (vit != rxPsd->ValuesEnd ())
92  {
93  NS_ASSERT (fit != rxPsd->ConstBandsEnd ());
94  NS_LOG_LOGIC ("Ptx = " << *vit);
95  *vit /= m_lossLinear; // Prx = Ptx / loss
96  NS_LOG_LOGIC ("Prx = " << *vit);
97  ++vit;
98  ++fit;
99  }
100  return rxPsd;
101 }
102 
103 
104 } // namespace ns3