width =2e-9;
ts = 2e-10;
ratio = 1/2;
n = width/ts;
t = 0:ts:width;
A = 1;
Tau = width/2.1432;   
Tc = width/2;
x = A*(1-4*pi*(t-Tc).*(t-Tc)/(Tau*Tau)).*exp(-2*pi*(t-Tc).*(t-Tc)/(Tau*Tau));
y = [x(1:n)';zeros(n/ratio,1)]; 
%------------------------------------------------------------
h = uwb_imr(1, 1);
%------------------------------------------------------------
rx=conv(h,y);