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lr-wpan-error-model.cc
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1 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2011 The Boeing Company
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: Gary Pei <guangyu.pei@boeing.com>
19  */
20 #include "lr-wpan-error-model.h"
21 #include <ns3/log.h>
22 
23 #include <cmath>
24 
25 NS_LOG_COMPONENT_DEFINE ("LrWpanErrorModel");
26 
27 namespace ns3 {
28 
29 NS_OBJECT_ENSURE_REGISTERED (LrWpanErrorModel);
30 
31 TypeId
32 LrWpanErrorModel::GetTypeId (void)
33 {
34  static TypeId tid = TypeId ("ns3::LrWpanErrorModel")
35  .SetParent<Object> ()
36  .AddConstructor<LrWpanErrorModel> ()
37  ;
38  return tid;
39 }
40 
41 LrWpanErrorModel::LrWpanErrorModel (void)
42 {
43  m_binomialCoefficients[0] = 1;
44  m_binomialCoefficients[1] = -16;
45  m_binomialCoefficients[2] = 120;
46  m_binomialCoefficients[3] = -560;
47  m_binomialCoefficients[4] = 1820;
48  m_binomialCoefficients[5] = -4368;
49  m_binomialCoefficients[6] = 8008;
50  m_binomialCoefficients[7] = -11440;
51  m_binomialCoefficients[8] = 12870;
52  m_binomialCoefficients[9] = -11440;
53  m_binomialCoefficients[10] = 8008;
54  m_binomialCoefficients[11] = -4368;
55  m_binomialCoefficients[12] = 1820;
56  m_binomialCoefficients[13] = -560;
57  m_binomialCoefficients[14] = 120;
58  m_binomialCoefficients[15] = -16;
59  m_binomialCoefficients[16] = 1;
60 }
61 
62 double
63 LrWpanErrorModel::GetChunkSuccessRate (double snr, uint32_t nbits) const
64 {
65  double ber = 0.0;
66 
67  for (uint32_t k = 2; k <= 16; k++)
68  {
69  ber += m_binomialCoefficients[k] * exp (20.0 * snr * (1.0 / k - 1.0));
70  }
71 
72  ber = ber * 8.0 / 15.0 / 16.0;
73 
74  ber = std::min (ber, 1.0);
75  double retval = pow (1.0 - ber, nbits);
76  return retval;
77 }
78 
79 } // namespace ns3
ns3::LrWpanErrorModel::GetChunkSuccessRate
double GetChunkSuccessRate(double snr, uint32_t nbits) const
Return chunk success rate for given SNR.
Definition: lr-wpan-error-model.cc:63
NS_OBJECT_ENSURE_REGISTERED
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register the class in the ns-3 factory.
Definition: object-base.h:38
NS_LOG_COMPONENT_DEFINE
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:170
ns3::LrWpanErrorModel::m_binomialCoefficients
double m_binomialCoefficients[17]
Array of precalculated binomial coefficients.
Definition: lr-wpan-error-model.h:59
ns3::LrWpanErrorModel::GetTypeId
static TypeId GetTypeId(void)
Get the type ID.
Definition: lr-wpan-error-model.cc:32
ns3::Object
a base class which provides memory management and object aggregation
Definition: object.h:64
ns3::TypeId
a unique identifier for an interface.
Definition: type-id.h:49
ns3::TypeId::SetParent
TypeId SetParent(TypeId tid)
Definition: type-id.cc:610