how to find one-dimensional Brownian motion in matlab

[sharmila svsas]

TS fuzzy stochastic system : 

dx(t)=[A_i x(t)+B_i u(t)+D_i w(t)]dt+E_i f(x,t)dW(t)

y(t)=C_i x(t).

here W(t) stands for a one-dimensional Brownian motion. But I dont know, how to add E_i f(x,t)dW(t) term in matlab. 

please tell me