A Discrete-Event Network Simulator
API
lr-wpan-error-model.cc
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2011 The Boeing Company
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: Gary Pei <guangyu.pei@boeing.com>
18  */
19 #include "lr-wpan-error-model.h"
20 
21 #include <ns3/log.h>
22 
23 #include <cmath>
24 
25 namespace ns3
26 {
27 
28 NS_LOG_COMPONENT_DEFINE("LrWpanErrorModel");
29 
30 NS_OBJECT_ENSURE_REGISTERED(LrWpanErrorModel);
31 
32 TypeId
33 LrWpanErrorModel::GetTypeId()
34 {
35  static TypeId tid = TypeId("ns3::LrWpanErrorModel")
36  .SetParent<Object>()
37  .SetGroupName("LrWpan")
38  .AddConstructor<LrWpanErrorModel>();
39  return tid;
40 }
41 
42 LrWpanErrorModel::LrWpanErrorModel()
43 {
44  m_binomialCoefficients[0] = 1;
45  m_binomialCoefficients[1] = -16;
46  m_binomialCoefficients[2] = 120;
47  m_binomialCoefficients[3] = -560;
48  m_binomialCoefficients[4] = 1820;
49  m_binomialCoefficients[5] = -4368;
50  m_binomialCoefficients[6] = 8008;
51  m_binomialCoefficients[7] = -11440;
52  m_binomialCoefficients[8] = 12870;
53  m_binomialCoefficients[9] = -11440;
54  m_binomialCoefficients[10] = 8008;
55  m_binomialCoefficients[11] = -4368;
56  m_binomialCoefficients[12] = 1820;
57  m_binomialCoefficients[13] = -560;
58  m_binomialCoefficients[14] = 120;
59  m_binomialCoefficients[15] = -16;
60  m_binomialCoefficients[16] = 1;
61 }
62 
63 double
64 LrWpanErrorModel::GetChunkSuccessRate(double snr, uint32_t nbits) const
65 {
66  double ber = 0.0;
67 
68  for (uint32_t k = 2; k <= 16; k++)
69  {
70  ber += m_binomialCoefficients[k] * exp(20.0 * snr * (1.0 / k - 1.0));
71  }
72 
73  ber = ber * 8.0 / 15.0 / 16.0;
74 
75  ber = std::min(ber, 1.0);
76  double retval = pow(1.0 - ber, nbits);
77  return retval;
78 }
79 
80 } // namespace ns3
min
#define min(a, b)
Definition: 80211b.c:41
ns3::LrWpanErrorModel
Model the error rate for IEEE 802.15.4 2.4 GHz AWGN channel for OQPSK the model description can be fo...
Definition: lr-wpan-error-model.h:35
ns3::LrWpanErrorModel::m_binomialCoefficients
double m_binomialCoefficients[17]
Array of precalculated binomial coefficients.
Definition: lr-wpan-error-model.h:59
ns3::LrWpanErrorModel::GetChunkSuccessRate
double GetChunkSuccessRate(double snr, uint32_t nbits) const
Return chunk success rate for given SNR.
Definition: lr-wpan-error-model.cc:64
ns3::LrWpanErrorModel::GetTypeId
static TypeId GetTypeId()
Get the type ID.
Definition: lr-wpan-error-model.cc:33
ns3::Object
A base class which provides memory management and object aggregation.
Definition: object.h:89
ns3::TypeId
a unique identifier for an interface.
Definition: type-id.h:59
ns3::TypeId::SetParent
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:931
NS_LOG_COMPONENT_DEFINE
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:202
NS_OBJECT_ENSURE_REGISTERED
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:46
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.