A Discrete-Event Network Simulator
API
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Groups Pages
uan-prop-model-thorp.cc
Go to the documentation of this file.
1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2009 University of Washington
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: Leonard Tracy <lentracy@gmail.com>
19  */
20 #include "uan-prop-model-thorp.h"
21 #include "uan-tx-mode.h"
22 #include "ns3/double.h"
23 #include "ns3/log.h"
24 
25 NS_LOG_COMPONENT_DEFINE ("UanPropModelThorp");
26 
27 namespace ns3 {
28 
29 NS_OBJECT_ENSURE_REGISTERED (UanPropModelThorp);
30 
31 UanPropModelThorp::UanPropModelThorp ()
32 {
33 }
34 
35 UanPropModelThorp::~UanPropModelThorp ()
36 {
37 }
38 
39 TypeId
40 UanPropModelThorp::GetTypeId (void)
41 {
42  static TypeId tid = TypeId ("ns3::UanPropModelThorp")
43  .SetParent<Object> ()
44  .AddConstructor<UanPropModelThorp> ()
45  .AddAttribute ("SpreadCoef",
46  "Spreading coefficient used in calculation of Thorp's approximation",
47  DoubleValue (1.5),
48  MakeDoubleAccessor (&UanPropModelThorp::m_SpreadCoef),
49  MakeDoubleChecker<double> ())
50  ;
51  return tid;
52 }
53 
54 double
55 UanPropModelThorp::GetPathLossDb (Ptr<MobilityModel> a, Ptr<MobilityModel> b, UanTxMode mode)
56 {
57  double dist = a->GetDistanceFrom (b);
58 
59  return m_SpreadCoef * 10.0 * log10 (dist)
60  + dist * GetAttenDbKm (mode.GetCenterFreqHz () / 1000.0);
61 }
62 
63 UanPdp
64 UanPropModelThorp::GetPdp (Ptr<MobilityModel> a, Ptr<MobilityModel> b, UanTxMode mode)
65 {
66  return UanPdp::CreateImpulsePdp ();
67 }
68 
69 Time
70 UanPropModelThorp::GetDelay (Ptr<MobilityModel> a, Ptr<MobilityModel> b, UanTxMode mode)
71 {
72  return Seconds (a->GetDistanceFrom (b) / 1500.0);
73 }
74 
75 double
76 UanPropModelThorp::GetAttenDbKyd (double freqKhz)
77 {
78 
79  return GetAttenDbKm (freqKhz) / 1.093613298;
80 }
81 
82 double
83 UanPropModelThorp::GetAttenDbKm (double freqKhz)
84 {
85 
86  double fsq = freqKhz * freqKhz;
87  double atten;
88 
89  if (freqKhz >= 0.4)
90  {
91  atten = 0.11 * fsq / (1 + fsq) + 44 * fsq / (4100 + freqKhz)
92  + 2.75 * 0.0001 * fsq + 0.003;
93  }
94  else
95  {
96  atten = 0.002 + 0.11 * (freqKhz / (1 + freqKhz)) + 0.011 * freqKhz;
97  }
98 
99  return atten;
100 }
101 
102 } // namespace ns3