MIMO channel used in communication toolbox i.e "mimochan" doesn't work properly with release 2009b onwards

Hi guys,

I am using mimochan to introduce timing delay to validate performance of a random access channel(RACH) used in wireless standards (In my case it's LTE ). I am observing if a Matlab simulation is done using release 2011b, it doesn't add any timing delay.

Is there any change in use of this function. I will highly appreciate to get help regarding this issue observed by me.

Thanks and Regards, Saurabh