the P25 is a standard as PMR and DPMR. I don't know what you need exactly for your research. Cyclostationary feature detection is impleted here to detect a P25 signal. There are some function which doesn't exsist in matalb2013. there are in matlab2014.
what do you need exactly for your work, maybe I could help you.
Does anybody know, what is the pattern matching algorithm implemented in the mentioned page? The SSCA used to estimate cyclic spectra is described in papers, but what is the math behind functions commP25decision_noise, commP25decision_c4fm and commP25decision_cqpsk?