Find delay between 2 signals, which delay is introduced during higher frequency processing

Hi,

I am working on BPSK-direct spread spectrum model in rayleigh fading channel, and calculating its error rate. Let's say my symbol rate is 1/1000, and the spreading factor is 2.

When I want to calculate error rate between transmitted and received symbol, I need to compensate for delay introduced by Rayleigh Fading block. I compensate it by using Align Signal block. However, no matter how large I set my correlation window on Align Signal block the delay estimated is not stabilizing to a value, thus the alignment fail.

I think this is because delay introduced in Rayleigh Fading block is applied on my spread signal which rate is 1/(1000*2), while the error rate calculation and signal alignment happens in signal of 1/1000 rate.

May I know how to cope with this situation?

Thank you, Dareen