Hello,
In ns2.35/tcl/ex/IEEE.802-11.a.tcl, we have the parameters to simulate 802.11a
with 802.11Ext module. As I read in documentations of 802.11Ext, the parameters
for 802.11 b/g should be set by the user.
Below is the content of "EEE.802-11.a.tc", I wonder if it is sufficient to only
change these parameters to simulate 802.11 b/g.
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
In fact, "802.11a" and "802.11b" use OFDM and the signal is spread over 20 MHz
while 802.11 b uses DSSS modulation and the signal is spread over 22 MHz but I
do not know how to change these parameters.
Thanks,
Best regards,
Behnaz
