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How to Simulate IEEE 802.11a MAC Protocol in NS2?

Source Code

TCL part :

# Change Phy and Mac

set val(netif) Phy/WirelessPhyExt ;# network interface type

set val(mac) Mac/802_11Ext ;# MAC type

#802.11a parameters

Phy/WirelessPhyExt set CSThresh_ 6.31e-12 ;#-82 dBm Wireless interface sensitivity ;#(sensitivity defined in the standard)
Phy/WirelessPhyExt set Pt_ 0.001
Phy/WirelessPhyExt set freq_ 5.18e+9
Phy/WirelessPhyExt set noise_floor_ 2.512e-13 ;#-96 dBm for 10MHz bandwidth
Phy/WirelessPhyExt set L_ 1.0 ;#default radio circuit gain/loss
Phy/WirelessPhyExt set PowerMonitorThresh_ 1.259e-13 ;#-99dBm power monitor ;#sensitivity
Phy/WirelessPhyExt set HeaderDuration_ 0.000020 ;#20 us
Phy/WirelessPhyExt set BasicModulationScheme_ 0
Phy/WirelessPhyExt set PreambleCaptureSwitch_ 1
Phy/WirelessPhyExt set DataCaptureSwitch_ 0
Phy/WirelessPhyExt set SINR_PreambleCapture_ 2.5118; ;# 4 dB
Phy/WirelessPhyExt set SINR_DataCapture_ 100.0; ;# 10 dB
Phy/WirelessPhyExt set trace_dist_ 1e6
;# PHY trace until distance of 1 Mio. km; #("infinty")

Phy/WirelessPhyExt set PHY_DBG_ 0
Mac/802_11Ext set CWMin_ 15
Mac/802_11Ext set CWMax_ 1023
Mac/802_11Ext set SlotTime_ 0.000009
Mac/802_11Ext set SIFS_ 0.000016
Mac/802_11Ext set ShortRetryLimit_ 7
Mac/802_11Ext set LongRetryLimit_ 4
Mac/802_11Ext set HeaderDuration_ 0.000020
Mac/802_11Ext set SymbolDuration_ 0.000004
Mac/802_11Ext set BasicModulationScheme_ 0
Mac/802_11Ext set use_802_11a_flag_ true
#Mac/802_11Ext set RTSThreshold_ 2346
Mac/802_11Ext set MAC_DBG 0
# fix for when RTS/CTS not used
#Mac/802_11 set RTS_ 20.0
#Mac/802_11 set CTS_ 14.0