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[ns] Problem with wireless throughput Simulation Help!!!



Hi:
 
I'm a new user of NS.
I have tried to use NS to simulate the wireless throughput .
And I have some questions.
 
1)I know that the 802.11 of NS is implemented with DCF.
  When two tranmitter very closesly, and with CBR traffic
  the nam output shows the packets are dropped, but the xgraph shows the output about 1Mb
  
  I use LossMonitor as the tutorial.
  And the traffic source is [new Application/Traffic/CBR]
  
  I've tried TCPSink instead of LossMonitor, but the error will occur.
 
  Thanks for your help. :)