Open loop State estimator input problem / observers

Hello guys, i want to simulate an example from a pdf that i find from the internet. It says to find the openloop estimator. It gives the A, B, C, D matrices and the initial conditions. My problem is that the only thing that says about the input is " example uses strong u(t) to shake the things up" . :P

I tried to use step input and pulse but i didn;t take the same result