decider80211.h

基于omnet++开发的Mf框架下的802.11协议仿真。

/***************************************************************************
 * file:        Decider80211.h
 *
 * authors:     David Raguin / Marc Loebbers
 *
 * copyright:   (C) 2004 Telecommunication Networks Group (TKN) at
 *              Technische Universitaet Berlin, Germany.
 *
 *              This program is free software; you can redistribute it 
 *              and/or modify it under the terms of the GNU General Public 
 *              License as published by the Free Software Foundation; either
 *              version 2 of the License, or (at your option) any later 
 *              version.
 *              For further information see file COPYING 
 *              in the top level directory
 ***************************************************************************
 * part of:     framework implementation developed by tkn
 * description: decider module for the 802.11 protocol
 ***************************************************************************
 * changelog:   $Revision$
 *              last modified:   $Date: 2004-08-16 18:18:47 +0200 (Mon, 16 Aug 2004) $
 *              by:              $Author: omfw-willkomm $
 **************************************************************************/


#ifndef  DECIDER_80211_H
#define  DECIDER_80211_H

#include <omnetpp.h>

#include <BasicDecider.h>

/**
 * @brief Decider for the 802.11 modules
 *
 * Depending on the minimum of the snr included in the PhySDU this
 * module computes a bit error probability. The header (1 Mbit/s) is
 * always modulated with DBQPSK. The PDU is normally modulated either
 * with DBPSK (1 and 2 Mbit/s) or CCK (5.5 and 11 Mbit/s). CCK is not
 * easy to model, therefore it is modeled as DQPSK with a 16-QAM for
 * 5.5 Mbit/s and a 256-QAM for 11 Mbit/s.
 *
 *
 * @ingroup decider 
 * @author Marc L鯾bers, David Raguin
 */
class Decider80211 : public BasicDecider
{
  Module_Class_Members(Decider80211, BasicDecider,0);

  
  
 protected:


 public:
  /** @brief Initialization of the module and some variables*/
  virtual void initialize(int);
  
  
 protected:
  /**
   * @brief In this function the decision whether a frame is received
   * correctly or not is made.
   **/
  virtual void  handleLowerMsg(AirFrame*, SnrList&);

  /**\brief converts a dB value into a normal fraction*/
  double dB2fraction(double);

  /**\brief computes if packet is ok or has errors*/
  bool packetOk(double, int);

#ifdef _WIN32
	/**
	 * @brief Implementation of the error function
	 *
	 * Unfortunately the windows math library does not provide an 
	 * implementation of the error function, so we use an own 
	 * implementation (Thanks to Jirka Klaue)
	 *
	 * @author Jirka Klaue
	 **/ 
  double erfc(double);
#endif

 protected:
  /**\brief should be set in the omnetpp.ini*/
  double bitrate;
  /**\brief should be set in the omnetpp.ini; everthing below this
     threshold can't be read and is therefor considered as a
     collision*/
  double snirThreshold;

};
#endif