GSM (or WCDMA) synchronization and coherent detection??

[Gemini1706]

wcdma synchronization

How the receiver locks first to the signal?

does it do symbol timing lock first, then frequency lock then phase lock?

SAy for GSM?
How about WCDMA?

How about FM?

If the receiver can lock to the freq using AFC, so what is the point of TCXO? why not just use a crystal?


Thanks in advance.

 

[brmadhukar]

gsm detector coherent

The receiver always locks by looking at a pattern (detection) and measuring the difference with the pattern (synch and tracking)

For the FM the pattern is the frequency...

The receivers cannot track very wide offsets from centrte frequency without performance degradation, so use of TCXOs in some cases.