function [x,y] = puncture_1bit(x1,x2,y1,y2,FrameL,Mem)

for i=1:FrameL-2*Mem
	x(i)= x1(i);
    if(mod(i,2))
		y(i)= y1(i);	
    else 
		y(i)= y2(i);	
    end
end
	
for i=FrameL-2*Mem+1:FrameL-Mem
	x(i)= x1(i);
	y(i)= y1(i);
    x(i+Mem)= x2(i);
	y(i+Mem)= y2(i);
end