Hilbert Huang Transform for delay finding between two non stationary signals???

I am trying to use Hilbert huang transform for delay finding between two non stationary signals. My procedure is 1. Empirical mode decomposition 2. Hilbert Analysis Herefrom I am unable to figure out how can I proceed two find the delay estimation between signals , say by using cross correlation or other process involving HHT? pleaseshare your views on this . Here is my piece of code x1=ParabEmd(a, r1, r2,1); xn =(hilbert(x1,1000)); xn1=real(xn); b=a_s(ts_in_epoch); x2=ParabEmd(b, r1, r2,1); yn =(hilbert(x2,1000)); yn1=real(yn); size of yn1 and xn1 is diffreent though time length is is same for both signal