[ns] how to simulate 802.11a channels in NS2 ?

[tdinhtoan]

hi,

I am going to simulate 802.11a channels in NS2, but i couldn't find out  
any tutorials about 802.11a in NS2. Could anyone help me some guides or  
examples about how to set up parameters in order to simulate 802.11a  
channels in NS2?

Thanks very much.

-toan.