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Algorithm for Residual frequency removal?

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Anybody here can recommend a good algorithm for removing residual frequency in DQPSK modem?

I'm wondering if it is possible for the algorithm to correct the residual frequency even before the symbol synchronizer gets lock.

regards
 

Paper with some algorithms

Carrier synchronization of offset QPSK, J. B. Berner,; P. W. Kinman,
2002 IEEE Aerospace Conference , March 9, 2002



**broken link removed**
:)
 

Thanks for your reply. I just took a rough look at this paper. It seems the algorithm is not suitable for my case. My design is a high speed modem(above 10M symbol rate). And the system frequency is only around 50M.
So my modem can't use so many multiplication. As the generated new frequency may alias back.

regards
 

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