[ns] How to measure the signal to interference value

[sivagami amirthalingam]

I am simulating Wireless network for IEEE 802.11standard. To analysis the network, I have chosen delay, througput , SNR and BER parameters. Any body can help me to calculate the SNR and BER value. 
   
  One more question. Any one tell how to set the value  'd' (no of packets after which the ack has to be sent by the sink)f or delayed acknowldegement of Agent/TcpSink/DelAck
  Thank you
  Sivagami

 				
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