You should make changes in some tcl files in the directory '.../tcl/lib/'.
See the following link: http://icapeople.epfl.ch/widmer/uwb/ns-2/index.html In this link many changes are made to install new changes in the physical and mac layers of ns-2. Also a new propagation model (tarokh propagation) is also added. See what are changed in the directory '.../tcl/lib/' regarding tarokh propagation only (DO NOT MAKE the other changes of course). You will find the changes in patch.tcl.lib file that you can download from the link above. I hope that this will help you. From: ibrahim koda [mailto:[EMAIL PROTECTED] Sent: Samstag, 15. September 2007 12:29 To: [EMAIL PROTECTED] Subject: Problem ricean propagation model Dear Samer Bali I am new to NS-2, and frankly I am still in the learning phase to use it in my study, I am trying to include the .cc and .h classes of the Ricean propagation model within the simulator. I am working under windows (using Cygwin).I have put the classes in the mobile directory in ns. When I am trying to test the Ricean propagation model (after I have added it to NS-2) using the following code I got the following error: invalid command name "Propagation/ricean" while executing "Propagation/ricean create _o12 " invoked from within "can't read "propInstance_": no such variable while executing "$ns_ set propInstance_" ... " . . . Here is the code portion related to the error: /************************************************************** set val(chan) Channel/WirelessChannel ;#Channel Type set val(prop) Propagation/Ricean ;# radio-propagation model set val(netif) Phy/WirelessPhy ;# network interface type set val(mac) Mac/802_11 ;# MAC type set val(ifq) Queue/DropTail/PriQueue ;# interface queue type set val(ll) LL ;# link layer type set val(ant) Antenna/OmniAntenna ;# antenna model set val(ifqlen) 50 ;# max packet in ifq set val(nn) 2 ;# number of mobilenodes set val(rp) DSDV ;# routing protocol #set val(rp) DSR ;# routing protocol set val(x) 500 set val(y) 500 # Initialize Global Variables set ns_ [new Simulator] set tracefd [open wireless_mitf.tr w] $ns_ trace-all $tracefd set namtrace [open wireless_mitf.nam w] $ns_ namtrace-all-wireless $namtrace $val(x) $val(y) # set up topography object set topo [new Topography] $topo load_flatgrid $val(x) $val(y) # set prop_inst [$ns_ set propInstance_] $prop_inst MaxVelocity 2.5; $prop_inst RiceanK 6; $prop_inst LoadRiceFile "rice_table.txt"; How can I solve such error Please if u can help me thank you Ibrahim Khider Eltahir Khider Communication Software and Switch Technology Research Center Dept of Electronic and Information Systems Huazhong University of Science and Technology ,P.R.China-Wuhan-430074 Mobile: 0086-27-63452269 Home Tel: 0086-27-87540211 _____ Tonight's top picks. What will you watch tonight? Preview <http://us.rd.yahoo.com/tv/mail/tagline/tonightspicks/evt=48220/*http:/tv.ya hoo.com/%20%0d%0a> the hottest shows on Yahoo! TV.
