[ns] How to get throughput of a MobileNode? 802.11

[Bahman Kalantari Sabet]

Hi,

I have two nodes.  1 Base Station node and 1 Mobile node.  im using FTP over 
TCP.
Sending packets from left to right in the network below.

BS(0)  ...(wireless connection)...   MobileNode(0)


How can I get/calculate the throughput?

When the MacTrace is OFF, I dont get any infromation im my trace file!
When the MacTrace is ON, I get lots of things (such as RTS,CTS,ACK,TCP,etc), 
but
how do I get the throughput?  I had an AWK to get the throughput but it
doesn't give my anything!!

Any suggestions??!!

Thanks,

Bahman.