simulink Gaussian filter

hello~ I have a question about I want to simulation a random bit through gaussian filter, but the result is so different from the paper I survey. Can someone teach me how to solve and how to set the parameter let me match the result. Here is my simulation picture and result.

http://cl.ly/0f3q1T2x1d1o1J0j1P0N

please help me, I have try and error for a long time. thanks