Problem about raised cosine filter in 'LTE PHY Downlink with Spatial Multiplexing'

Hi,

I down load the example 'LTE PHY Downlink with Spatial Multiplexing' and want to modify a little bit for further using. So I added Raised Cosine Filters in transmitter and receiver, shown as below:

the setting of Raised Cosine Filter is shown as below:

But the compare with the simulation results with original one, the BER is worse, and constellation looks strange. I tried to debug it, but can not find the solution.

Could you please help me to add Raised Cosine Filters properly in this platform?

Best,

Ruozhu