[ns] how to insert link delay in wireless link

[Mandar Choure]

Dear ns-users,
I am  simulating a wired-cum-wireless network from Marc Geris tutorial.
Please tell me how to insert link delay in wireless link and how to insert
channel error in this tcl script. I have to plot graphs of
Throughput V/S wireless link delay and
Throughput V/S channel error Rate
Please help me in this regard ,waiting for your reply..

Regards
Mandar