/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2005,2006 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "wifi-phy.h"

#include "wifi-mode.h"

#include "wifi-channel.h"

#include "wifi-preamble.h"

#include "ns3/simulator.h"

#include "ns3/packet.h"

#include "ns3/assert.h"

#include "ns3/log.h"

#include "ns3/double.h"

#include "ns3/uinteger.h"

#include "ns3/enum.h"

#include "ns3/trace-source-accessor.h"

#include <cmath>

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("WifiPhy");

/****************************************************************

 *       This destructor is needed.

 ****************************************************************/

WifiPhyListener::~WifiPhyListener ()

{

}

/****************************************************************

 *       The actual WifiPhy class

 ****************************************************************/

NS_OBJECT_ENSURE_REGISTERED (WifiPhy);

TypeId

WifiPhy::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::WifiPhy")

    .SetParent<Object> ()

    .AddTraceSource ("PhyTxBegin",

                     "Trace source indicating a packet "

                     "has begun transmitting over the channel medium",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyTxBeginTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("PhyTxEnd",

                     "Trace source indicating a packet "

                     "has been completely transmitted over the channel. "

                     "NOTE: the only official WifiPhy implementation "

                     "available to this date (YansWifiPhy) never fires "

                     "this trace source.",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyTxEndTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("PhyTxDrop",

                     "Trace source indicating a packet "

                     "has been dropped by the device during transmission",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyTxDropTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("PhyRxBegin",

                     "Trace source indicating a packet "

                     "has begun being received from the channel medium "

                     "by the device",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyRxBeginTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("PhyRxEnd",

                     "Trace source indicating a packet "

                     "has been completely received from the channel medium "

                     "by the device",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyRxEndTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("PhyRxDrop",

                     "Trace source indicating a packet "

                     "has been dropped by the device during reception",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyRxDropTrace),

                     "ns3::Packet::TracedCallback")

    .AddTraceSource ("MonitorSnifferRx",

                     "Trace source simulating a wifi device in monitor mode "

                     "sniffing all received frames",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyMonitorSniffRxTrace),

                     "ns3::WifiPhy::MonitorSnifferRxCallback")

    .AddTraceSource ("MonitorSnifferTx",

                     "Trace source simulating the capability of a wifi device "

                     "in monitor mode to sniff all frames being transmitted",

                     MakeTraceSourceAccessor (&WifiPhy::m_phyMonitorSniffTxTrace),

                     "ns3::WifiPhy::MonitorSnifferTxCallback")

  ;

  return tid;

}

WifiPhy::WifiPhy ()

{

  NS_LOG_FUNCTION (this);

}

WifiPhy::~WifiPhy ()

{

  NS_LOG_FUNCTION (this);

}

//Added by Ghada to support 11n

//return the L-SIG

WifiMode

WifiPhy::GetMFPlcpHeaderMode (WifiMode payloadMode, WifiPreamble preamble)

{

    switch (payloadMode.GetBandwidth ())

       {

       case 20000000:

          return WifiPhy::GetOfdmRate6_5MbpsBW20MHz ();

        case 40000000:

           return WifiPhy::GetOfdmRate13_5MbpsBW40MHz ();

        default:

            return WifiPhy::GetOfdmRate6_5MbpsBW20MHz ();

      }

}

{

  uint8_t Ndltf, Neltf;

  //We suppose here that STBC = 0. 

  //If STBC > 0, we need a different mapping between Nss and Nltf (IEEE 802.11n-2012 standard, page 1682).

  if (txvector.GetNss () < 3)

    {

      Ndltf = txvector.GetNss();

    }

  else 

    {

      Ndltf = 4;

    }

  if (txvector.GetNess () < 3)

    {

      Neltf = txvector.GetNess();

    }

  else 

    {

      Neltf = 4;

    }

  switch (preamble)

    {

     case WIFI_PREAMBLE_HT_MF:

     case WIFI_PREAMBLE_HT_GF:

     default:

       // no training for non HT

    }

}

//return L-SIG

{

         switch (preamble)

            {

             case WIFI_PREAMBLE_HT_MF:

               // HT-SIG

             case WIFI_PREAMBLE_HT_GF:

               //HT-SIG

             default:

               // no HT-SIG for non HT

            }

}

//end added by Ghada

WifiMode

WifiPhy::GetPlcpHeaderMode (WifiMode payloadMode, WifiPreamble preamble)

{

  switch (payloadMode.GetModulationClass ())

    {

    case WIFI_MOD_CLASS_OFDM:

      {

        switch (payloadMode.GetBandwidth ())

          {

          case 5000000:

            return WifiPhy::GetOfdmRate1_5MbpsBW5MHz ();

          case 10000000:

            return WifiPhy::GetOfdmRate3MbpsBW10MHz ();

          default:

            // (Section 18.3.2 "PLCP frame format"; IEEE Std 802.11-2012)

            // actually this is only the first part of the PlcpHeader,

            // because the last 16 bits of the PlcpHeader are using the

            // same mode of the payload

            return WifiPhy::GetOfdmRate6Mbps ();

          }

      }

    //Added by Ghada to support 11n

    case WIFI_MOD_CLASS_HT:

      {  //return the HT-SIG

         // IEEE Std 802.11n, 20.3.23

         switch (preamble)

           {

            case WIFI_PREAMBLE_HT_MF:

                switch (payloadMode.GetBandwidth ())

                  {

                   case 20000000:

                      return WifiPhy::GetOfdmRate13MbpsBW20MHz ();

                   case 40000000:

                      return WifiPhy::GetOfdmRate27MbpsBW40MHz ();

                   default:

                      return WifiPhy::GetOfdmRate13MbpsBW20MHz ();

                  }

            case WIFI_PREAMBLE_HT_GF:

                  switch (payloadMode.GetBandwidth ())

                  {

                   case 20000000:

                      return WifiPhy::GetOfdmRate13MbpsBW20MHz ();

                   case 40000000:

                      return WifiPhy::GetOfdmRate27MbpsBW40MHz ();

                   default:

                      return WifiPhy::GetOfdmRate13MbpsBW20MHz ();

                  }

             default:

                return WifiPhy::GetOfdmRate6Mbps ();

          }

      }

    case WIFI_MOD_CLASS_ERP_OFDM:

      return WifiPhy::GetErpOfdmRate6Mbps ();

    case WIFI_MOD_CLASS_DSSS:

      if (preamble == WIFI_PREAMBLE_LONG)

        {

          // (Section 16.2.3 "PLCP field definitions" and Section 17.2.2.2 "Long PPDU format"; IEEE Std 802.11-2012)

          return WifiPhy::GetDsssRate1Mbps ();

        }

      else  //  WIFI_PREAMBLE_SHORT

        {

          // (Section 17.2.2.3 "Short PPDU format"; IEEE Std 802.11-2012)

          return WifiPhy::GetDsssRate2Mbps ();

        }

    default:

      NS_FATAL_ERROR ("unsupported modulation class");

      return WifiMode ();

    }

}

{

  switch (payloadMode.GetModulationClass ())

    {

    case WIFI_MOD_CLASS_OFDM:

      {

        switch (payloadMode.GetBandwidth ())

          {

          case 20000000:

          default:

            // (Section 18.3.3 "PLCP preamble (SYNC))" and Figure 18-4 "OFDM training structure"; IEEE Std 802.11-2012)

            // also (Section 18.3.2.4 "Timing related parameters" Table 18-5 "Timing-related parameters"; IEEE Std 802.11-2012)

            // We return the duration of the SIGNAL field only, since the

            // SERVICE field (which strictly speaking belongs to the PLCP

            // header, see Section 18.3.2 and Figure 18-1) is sent using the

            // payload mode.

          case 10000000:

            // (Section 18.3.2.4 "Timing related parameters" Table 18-5 "Timing-related parameters"; IEEE Std 802.11-2012)

          case 5000000:

            // (Section 18.3.2.4 "Timing related parameters" Table 18-5 "Timing-related parameters"; IEEE Std 802.11-2012)

          }

      }

     //Added by Ghada to support 11n

    case WIFI_MOD_CLASS_HT:

      { //IEEE 802.11n Figure 20.1

         switch (preamble)

            {

             case WIFI_PREAMBLE_HT_MF:

               // L-SIG

             case WIFI_PREAMBLE_HT_GF:

               //L-SIG

             default:

               // L-SIG

            }

      }

    case WIFI_MOD_CLASS_ERP_OFDM:

    case WIFI_MOD_CLASS_DSSS:

      if (preamble == WIFI_PREAMBLE_SHORT)

        {

          // (Section 17.2.2.3 "Short PPDU format" and Figure 17-2 "Short PPDU format"; IEEE Std 802.11-2012)

        }

      else // WIFI_PREAMBLE_LONG

        {

          // (Section 17.2.2.2 "Long PPDU format" and Figure 17-1 "Short PPDU format"; IEEE Std 802.11-2012)

        }

    default:

      NS_FATAL_ERROR ("unsupported modulation class");

    }

}

{

  switch (payloadMode.GetModulationClass ())

    {

    case WIFI_MOD_CLASS_OFDM:

      {

        switch (payloadMode.GetBandwidth ())

          {

          case 20000000:

          default:

            // (Section 18.3.3 "PLCP preamble (SYNC))" Figure 18-4 "OFDM training structure"

            // also Section 18.3.2.3 "Modulation-dependent parameters" Table 18-4 "Modulation-dependent parameters"; IEEE Std 802.11-2012)

          case 10000000:

            // (Section 18.3.3 "PLCP preamble (SYNC))" Figure 18-4 "OFDM training structure"

            // also Section 18.3.2.3 "Modulation-dependent parameters" Table 18-4 "Modulation-dependent parameters"; IEEE Std 802.11-2012)

          case 5000000:

            // (Section 18.3.3 "PLCP preamble (SYNC))" Figure 18-4 "OFDM training structure"

            // also Section 18.3.2.3 "Modulation-dependent parameters" Table 18-4 "Modulation-dependent parameters"; IEEE Std 802.11-2012)

          }

      }

    case WIFI_MOD_CLASS_HT:

      { //IEEE 802.11n Figure 20.1 the training symbols before L_SIG or HT_SIG

      }

    case WIFI_MOD_CLASS_ERP_OFDM:

    case WIFI_MOD_CLASS_DSSS:

      if (preamble == WIFI_PREAMBLE_SHORT)

        {

          // (Section 17.2.2.3 "Short PPDU format)" Figure 17-2 "Short PPDU format"; IEEE Std 802.11-2012)

        }

      else // WIFI_PREAMBLE_LONG

        {

          // (Section 17.2.2.2 "Long PPDU format)" Figure 17-1 "Long PPDU format"; IEEE Std 802.11-2012)

        }

    default:

      NS_FATAL_ERROR ("unsupported modulation class");

    }

}

{

  WifiMode payloadMode=txvector.GetMode();

  NS_LOG_FUNCTION (size << payloadMode);

  switch (payloadMode.GetModulationClass ())

    {

    case WIFI_MOD_CLASS_OFDM:

    case WIFI_MOD_CLASS_ERP_OFDM:

      {

        // (Section 18.3.2.4 "Timing related parameters" Table 18-5 "Timing-related parameters"; IEEE Std 802.11-2012

        // corresponds to T_{SYM} in the table)

        switch (payloadMode.GetBandwidth ())

          {

          case 20000000:

          default:

            break;

          case 10000000:

            break;

          case 5000000:

            break;

          }

        // (Section 18.3.2.3 "Modulation-dependent parameters" Table 18-4 "Modulation-dependent parameters"; IEEE Std 802.11-2012)

        // corresponds to N_{DBPS} in the table

        // (Section 18.3.5.4 "Pad bits (PAD)" Equation 18-11; IEEE Std 802.11-2012)

        uint32_t numSymbols = lrint (ceil ((16 + size * 8.0 + 6.0) / numDataBitsPerSymbol));

        // Add signal extension for ERP PHY

        if (payloadMode.GetModulationClass () == WIFI_MOD_CLASS_ERP_OFDM)

          {

          }

        else

          {

          }

      }

    case WIFI_MOD_CLASS_HT:

      {

         double m_Stbc;

        //if short GI data rate is used then symbol duration is 3.6us else symbol duration is 4us

        //In the future has to create a stationmanager that only uses these data rates if sender and reciever support GI

         if (payloadMode.GetUniqueName() == "OfdmRate135MbpsBW40MHzShGi" || payloadMode.GetUniqueName() == "OfdmRate65MbpsBW20MHzShGi" )

           {

           }

         else

           {

             switch (payloadMode.GetDataRate ()/ (txvector.GetNss()))

               { //shortGi

                  case 7200000:

                  case 14400000:

                  case 21700000:

                  case 28900000:

                  case 43300000:

                  case 57800000:

                  case 72200000:

                  case 15000000:

                  case 30000000:

                  case 45000000:

                  case 60000000:

                  case 90000000:

                  case 120000000:

                  case 150000000:

                    break;               

                 default:

              }

           }

         if  (txvector.IsStbc())

            m_Stbc=2;

         else

           m_Stbc=1;

         //check tables 20-35 and 20-36 in the standard to get cases when nes =2

         double Nes=1;

        // IEEE Std 802.11n, section 20.3.11, equation (20-32)

        uint32_t numSymbols = lrint (m_Stbc*ceil ((16 + size * 8.0 + 6.0*Nes) / (m_Stbc* numDataBitsPerSymbol)));

        if (frequency >= 2400 && frequency <= 2500) //at 2.4 GHz

          {

          }

        else  //at 5 GHz

          {

          }

      }

    case WIFI_MOD_CLASS_DSSS:

      // (Section 17.2.3.6 "Long PLCP LENGTH field"; IEEE Std 802.11-2012)

      NS_LOG_LOGIC (" size=" << size

                             << " mode=" << payloadMode

                             << " rate=" << payloadMode.GetDataRate () );

    default:

      NS_FATAL_ERROR ("unsupported modulation class");

    }

}