A Discrete-Event Network Simulator
API
uan-prop-model-thorp.cc
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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 */
21#include "uan-tx-mode.h"
22#include "ns3/double.h"
23#include "ns3/log.h"
24
25namespace ns3 {
26
27NS_LOG_COMPONENT_DEFINE ("UanPropModelThorp");
28
29NS_OBJECT_ENSURE_REGISTERED (UanPropModelThorp);
30
32{
33}
34
36{
37}
38
41{
42 static TypeId tid = TypeId ("ns3::UanPropModelThorp")
44 .SetGroupName ("Uan")
45 .AddConstructor<UanPropModelThorp> ()
46 .AddAttribute ("SpreadCoef",
47 "Spreading coefficient used in calculation of Thorp's approximation.",
48 DoubleValue (1.5),
50 MakeDoubleChecker<double> ())
51 ;
52 return tid;
53}
54
55double
57{
58 double dist = a->GetDistanceFrom (b);
59
60 return m_SpreadCoef * 10.0 * std::log10 (dist)
61 + (dist / 1000.0) * GetAttenDbKm (mode.GetCenterFreqHz () / 1000.0);
62}
63
66{
68}
69
70Time
72{
73 return Seconds (a->GetDistanceFrom (b) / 1500.0);
74}
75
76double
78{
79
80 return GetAttenDbKm (freqKhz) / 1.093613298;
81}
82
83double
85{
86
87 double fsq = freqKhz * freqKhz;
88 double atten;
89
90 if (freqKhz >= 0.4)
91 {
92 atten = 0.11 * fsq / (1 + fsq) + 44 * fsq / (4100 + fsq)
93 + 2.75 * 0.0001 * fsq + 0.003;
94 }
95 else
96 {
97 atten = 0.002 + 0.11 * (freqKhz / (1 + freqKhz)) + 0.011 * freqKhz;
98 }
99
100 return atten;
101}
102
103} // namespace ns3
This class can be used to hold variables of floating point type such as 'double' or 'float'.
Definition: double.h:41
double GetDistanceFrom(Ptr< const MobilityModel > position) const
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:104
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:922
The power delay profile returned by propagation models.
static UanPdp CreateImpulsePdp(void)
Get a unit impulse PDP at time 0.
Base class for implemented underwater propagation models.
Uses Thorp's approximation to compute pathloss.
virtual UanPdp GetPdp(Ptr< MobilityModel > a, Ptr< MobilityModel > b, UanTxMode mode)
Get the PDP for the path between two nodes.
virtual ~UanPropModelThorp()
Destructor.
UanPropModelThorp()
Default constructor.
virtual double GetPathLossDb(Ptr< MobilityModel > a, Ptr< MobilityModel > b, UanTxMode mode)
Computes pathloss between nodes a and b.
double GetAttenDbKm(double freqKhz)
Get the attenuation in dB / km.
virtual Time GetDelay(Ptr< MobilityModel > a, Ptr< MobilityModel > b, UanTxMode mode)
Finds propagation delay between nodes a and b.
static TypeId GetTypeId(void)
Register this type.
double m_SpreadCoef
Spreading coefficient used in calculation of Thorp's approximation.
double GetAttenDbKyd(double freqKhz)
Get the attenuation in dB / 1000 yards.
Abstraction of packet modulation information.
Definition: uan-tx-mode.h:42
uint32_t GetCenterFreqHz(void) const
Get the transmission center frequency.
Definition: uan-tx-mode.cc:57
Ptr< const AttributeAccessor > MakeDoubleAccessor(T1 a1)
Definition: double.h:42
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:206
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:45
Time Seconds(double value)
Construct a Time in the indicated unit.
Definition: nstime.h:1245
Every class exported by the ns3 library is enclosed in the ns3 namespace.