Wireless Error Model

[Fabio Nieri <nieri@magna.ing.unipi.it>]

Hi, 
I'm sorry for I've already asked this question a month ago but seeing that
it still remains unaswered I post it again. I'm trying to simulate a
wireless network with FTP traffic running on it and would like to insert a
two state Markovian error model at the physical layer level. 
I cannot find anything useful in the archives nor in the documentation;
all seems to be related to link errors.
Can anyone suggest how to insert such an error?

Thanks in advance

Fabio Nieri