1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3 * Copyright (c) 2009 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: Nicola Baldo <nbaldo@cttc.es>
19 */
20
21
22 #include "spectrum-interference.h"
23 #include "spectrum-error-model.h"
24
25 #include <ns3/simulator.h>
26 #include <ns3/log.h>
27
28
29 namespace ns3 {
30
31 NS_LOG_COMPONENT_DEFINE ("SpectrumInterference");
32
SpectrumInterference()33 SpectrumInterference::SpectrumInterference ()
34 : m_receiving (false),
35 m_rxSignal (0),
36 m_allSignals (0),
37 m_noise (0),
38 m_errorModel (0)
39 {
40 NS_LOG_FUNCTION (this);
41 }
42
~SpectrumInterference()43 SpectrumInterference::~SpectrumInterference ()
44 {
45 NS_LOG_FUNCTION (this);
46 }
47
48 TypeId
GetTypeId()49 SpectrumInterference::GetTypeId ()
50 {
51 static TypeId tid = TypeId ("ns3::SpectrumInterference")
52 .SetParent<Object> ()
53 .SetGroupName ("Spectrum")
54 .AddConstructor<SpectrumInterference> ()
55 ;
56 return tid;
57 }
58
59 void
DoDispose()60 SpectrumInterference::DoDispose ()
61 {
62 NS_LOG_FUNCTION (this);
63 m_rxSignal = 0;
64 m_allSignals = 0;
65 m_noise = 0;
66 m_errorModel = 0;
67 Object::DoDispose ();
68 }
69
70 void
StartRx(Ptr<const Packet> p,Ptr<const SpectrumValue> rxPsd)71 SpectrumInterference::StartRx (Ptr<const Packet> p, Ptr<const SpectrumValue> rxPsd)
72 {
73 NS_LOG_FUNCTION (this << p << *rxPsd);
74 m_rxSignal = rxPsd;
75 m_lastChangeTime = Now ();
76 m_receiving = true;
77 m_errorModel->StartRx (p);
78 }
79
80 void
AbortRx()81 SpectrumInterference::AbortRx ()
82 {
83 m_receiving = false;
84 }
85
86 bool
EndRx()87 SpectrumInterference::EndRx ()
88 {
89 NS_LOG_FUNCTION (this);
90 ConditionallyEvaluateChunk ();
91 m_receiving = false;
92 return m_errorModel->IsRxCorrect ();
93 }
94
95
96 void
AddSignal(Ptr<const SpectrumValue> spd,const Time duration)97 SpectrumInterference::AddSignal (Ptr<const SpectrumValue> spd, const Time duration)
98 {
99 NS_LOG_FUNCTION (this << *spd << duration);
100 DoAddSignal (spd);
101 Simulator::Schedule (duration, &SpectrumInterference::DoSubtractSignal, this, spd);
102 }
103
104
105 void
DoAddSignal(Ptr<const SpectrumValue> spd)106 SpectrumInterference::DoAddSignal (Ptr<const SpectrumValue> spd)
107 {
108 NS_LOG_FUNCTION (this << *spd);
109 ConditionallyEvaluateChunk ();
110 (*m_allSignals) += (*spd);
111 m_lastChangeTime = Now ();
112 }
113
114 void
DoSubtractSignal(Ptr<const SpectrumValue> spd)115 SpectrumInterference::DoSubtractSignal (Ptr<const SpectrumValue> spd)
116 {
117 NS_LOG_FUNCTION (this << *spd);
118 ConditionallyEvaluateChunk ();
119 (*m_allSignals) -= (*spd);
120 m_lastChangeTime = Now ();
121 }
122
123
124 void
ConditionallyEvaluateChunk()125 SpectrumInterference::ConditionallyEvaluateChunk ()
126 {
127 NS_LOG_FUNCTION (this);
128 NS_LOG_LOGIC ("m_receiving: " << m_receiving );
129 NS_LOG_LOGIC ("m_lastChangeTime: " << m_lastChangeTime << " Now: " << Now ());
130 bool condition = m_receiving && (Now () > m_lastChangeTime);
131 NS_LOG_LOGIC ("if condition: " << condition);
132 if (condition)
133 {
134 SpectrumValue sinr = (*m_rxSignal) / ((*m_allSignals) - (*m_rxSignal) + (*m_noise));
135 Time duration = Now () - m_lastChangeTime;
136 NS_LOG_LOGIC ("calling m_errorModel->EvaluateChunk (sinr, duration)");
137 m_errorModel->EvaluateChunk (sinr, duration);
138 }
139 }
140
141 void
SetNoisePowerSpectralDensity(Ptr<const SpectrumValue> noisePsd)142 SpectrumInterference::SetNoisePowerSpectralDensity (Ptr<const SpectrumValue> noisePsd)
143 {
144 NS_LOG_FUNCTION (this << noisePsd);
145 m_noise = noisePsd;
146 // we can initialize m_allSignal only now, because earlier we
147 // didn't know what spectrum model was going to be used.
148 // we'll now create a zeroed SpectrumValue using the same
149 // SpectrumModel which is being specified for the noise.
150 m_allSignals = Create<SpectrumValue> (noisePsd->GetSpectrumModel ());
151 }
152
153 void
SetErrorModel(Ptr<SpectrumErrorModel> e)154 SpectrumInterference::SetErrorModel (Ptr<SpectrumErrorModel> e)
155 {
156 NS_LOG_FUNCTION (this << e);
157 m_errorModel = e;
158 }
159
160
161
162
163 } // namespace ns3
164
165
166