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Synchronization of DMR Signal (before demodulation)

Posted: Wed Dec 21, 2016 5:09 pm
by AmatorRadioResearch
Hi everyone I am focusing on the demodulation of c4fm modulation which is actually a Continuous Phase 4 Frequency Shift Keying (CP4FSK). The demodulation method of mine works perfectly if time synchronization is done beforehand. By the way I have no Idea how the synchronization is carried out in DMR signals. There is a sync pattern in the document which has 48 bits (or equivalently 24 symbols) by which we can correlate to find the sync signal. But no correlation is found in my synchronization , and no peak is detected.
Would you mind helping with me if you have any experience in the synchronization of DMR ? With regards, Amator Radio Research

Re: Synchronization of DMR Signal (before demodulation)

Posted: Sun Jan 15, 2017 10:56 am
by AmatorRadioResearch
Again I found the answer myself!
what forum is this ?
no one helps us!
any one has any inquiry regarding the synchronization of DMR
can reach me at [email protected]

Re: Synchronization of DMR Signal (before demodulation)

Posted: Mon Jan 16, 2017 2:16 am
by rtlsdrblog
Not yet many users here with in depth technical DSP knowledge about DMR who could answer your questions. Most are people who need help getting software to run, or are trying to decode a well known signal. Probably ##rtlsdr on freenode IRC might be better for this type of question.

Re: Synchronization of DMR Signal (before demodulation)

Posted: Fri Jan 20, 2017 10:49 pm
by Username
it would be interesting to. How does it DSD+ do?