matlab:simulation noises

[alih]

Dear All
these codes are the simulation of diffrent noises(stationary non goussian noise, non stationary non goussian noise) ; but i think there is some problem.if any body know a bout this ,plz help me.

Regards,


noise3=stationary non goussian noise ,s=signal length

N= length(s);
x1=exprnd(.5,1,N/4);
x2=-exprnd(.5,1,N/4);
x3=exprnd(.5,1,N/4);
x4=-exprnd(.5,1,N/4);
noise3=[[x1,x2],[x3,x4]];




noise4= non stationary non goussian noise ,FS=data length
Y1=exprnd(.5,1,FS/4);
Y2=-exprnd(.5,1,FS/4);
Y3=exprnd(.25,1,FS/4);
Y4=-exprnd(.25,1,FS/4);

noise4=[[Y1,Y2],[Y3,Y4]];