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error-rate-model.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2005,2006 INRIA
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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
19  */
20 #include "error-rate-model.h"
21 
22 namespace ns3 {
23 
24 NS_OBJECT_ENSURE_REGISTERED (ErrorRateModel);
25 
27 {
28  static TypeId tid = TypeId ("ns3::ErrorRateModel")
29  .SetParent<Object> ()
30  ;
31  return tid;
32 }
33 
34 double
35 ErrorRateModel::CalculateSnr (WifiMode txMode, double ber) const
36 {
37  // This is a very simple binary search.
38  double low, high, precision;
39  low = 1e-25;
40  high = 1e25;
41  precision = 1e-12;
42  while (high - low > precision)
43  {
44  NS_ASSERT (high >= low);
45  double middle = low + (high - low) / 2;
46  if ((1 - GetChunkSuccessRate (txMode, middle, 1)) > ber)
47  {
48  low = middle;
49  }
50  else
51  {
52  high = middle;
53  }
54  }
55  return low;
56 }
57 
58 } // namespace ns3
static TypeId GetTypeId(void)
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register the class in the ns-3 factory.
Definition: object-base.h:38
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file...
Definition: assert.h:61
represent a single transmission modeA WifiMode is implemented by a single integer which is used to lo...
Definition: wifi-mode.h:91
virtual double GetChunkSuccessRate(WifiMode mode, double snr, uint32_t nbits) const =0
A pure virtual method that must be implemented in the subclass.
a base class which provides memory management and object aggregation
Definition: object.h:64
a unique identifier for an interface.
Definition: type-id.h:49
TypeId SetParent(TypeId tid)
Definition: type-id.cc:610
double CalculateSnr(WifiMode txMode, double ber) const