--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/devices/wifi/interference-helper.h	Sat Jun 14 10:52:10 2008 -0700
@@ -0,0 +1,107 @@
+#ifndef INTERFERENCE_HELPER_H
+#define INTERFERENCE_HELPER_H
+
+#include <stdint.h>
+#include <vector>
+#include <list>
+#include "wifi-mode.h"
+#include "wifi-preamble.h"
+#include "ns3/nstime.h"
+#include "ns3/ref-count-base.h"
+
+namespace ns3 {
+
+class ErrorRateModel;
+
+class InterferenceHelper
+{
+public:
+  class Event : public RefCountBase
+  {
+  public:
+    Event (uint32_t size, WifiMode payloadMode, 
+	     enum WifiPreamble preamble,
+	     Time duration, double rxPower);
+    virtual ~Event ();
+  
+    Time GetDuration (void) const;
+    Time GetStartTime (void) const;
+    Time GetEndTime (void) const;
+    bool Overlaps (Time time) const;
+    double GetRxPowerW (void) const;
+    uint32_t GetSize (void) const;
+    WifiMode GetPayloadMode (void) const;
+    enum WifiPreamble GetPreambleType (void) const;
+  private:
+    uint32_t m_size;
+    WifiMode m_payloadMode;
+    enum WifiPreamble m_preamble;
+    Time m_startTime;
+    Time m_endTime;
+    double m_rxPowerW;
+  };
+  struct SnrPer 
+  {
+    double snr;
+    double per;
+  };
+
+  InterferenceHelper ();
+
+  void Configure80211aParameters (void);
+  void SetNoiseFloorW (double noiseFloor);
+  void SetErrorRateModel (Ptr<ErrorRateModel> rate);
+
+  double GetNoiseFloorW (void) const;
+  Ptr<ErrorRateModel> GetErrorRateModel (void) const;
+
+
+  /**
+   * \param energyW the minimum energy (W) requested
+   * \returns the expected amount of time the observed 
+   *          energy on the medium will be higher than
+   *          the requested threshold.
+   */
+  Time GetEnergyDuration (double energyW);
+  Time CalculateTxDuration (uint32_t size, WifiMode payloadMode, WifiPreamble preamble) const;
+  Ptr<InterferenceHelper::Event> Add (uint32_t size, WifiMode payloadMode, 
+				      enum WifiPreamble preamble,
+				      Time duration, double rxPower);
+
+  struct InterferenceHelper::SnrPer CalculateSnrPer (Ptr<InterferenceHelper::Event> event);
+private:
+  class NiChange {
+  public:
+    NiChange (Time time, double delta);
+    Time GetTime (void) const;
+    double GetDelta (void) const;
+    bool operator < (NiChange const &o) const;
+  private:
+    Time m_time;
+    double m_delta;
+  };
+  typedef std::vector <NiChange> NiChanges;
+  typedef std::list<Ptr<Event> > Events;
+
+  void AppendEvent (Ptr<Event> event);
+  double CalculateNoiseInterferenceW (Ptr<Event> event, NiChanges *ni) const;
+  double CalculateSnr (double signal, double noiseInterference, WifiMode mode) const;
+  double CalculateChunkSuccessRate (double snir, Time delay, WifiMode mode) const;
+  double CalculatePer (Ptr<const Event> event, NiChanges *ni) const;
+  Time GetMaxPacketDuration (void) const;
+
+  uint64_t m_plcpLongPreambleDelayUs;
+  uint64_t m_plcpShortPreambleDelayUs;
+  WifiMode m_longPlcpHeaderMode;
+  WifiMode m_shortPlcpHeaderMode;
+  uint32_t m_plcpHeaderLength;
+  Time m_maxPacketDuration;
+  double m_noiseFloorW;
+  Events m_events;
+  bool m_80211a;
+  Ptr<ErrorRateModel> m_errorRateModel;
+};
+
+} // namespace ns3
+
+#endif /* INTERFERENCE_HELPER_H */