Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate
2006-04-25
2006-04-25
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
C375S316000
Reexamination Certificate
active
07035364
ABSTRACT:
A digital receiver fast frequency and time acquisition system (200) for accurately providing both time and frequency synchronization to an incoming data stream with minimal delay to prevent any loss of incoming digital information. The invention provides synchronization with only a single synchronization word and includes a first channel select (CS) filter (204) that filters an incoming digital signal (202). A frame synchronization detector (206) then recognizes the time synchronization word from the first filtered signal. A coarse symbol time estimator (208) is then used for coarsely adjusting the time synchronization of the digital signal from the frame synchronization detector (206) and a fine frequency estimator (210) finely adjusts the frequency of the signal from the coarse symbol time estimator (208) for providing a frequency adjusted signal. A mixer (212) then combines the incoming digital signal with the frequency adjusted signal and provides a time and frequency compensated digital signal. A second CS filter (214) filters the frequency compensated digital signal and a fine symbol time estimator (216) works to determine symbol timing with greater precision. Finally, a symbol detector (218) is used for interpreting the incoming digital signal.
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Nangia Vijay
Ooi Leng H.
Talwalkar Sumit A.
Doutre Barbara R.
Meek Jacob
Motorola Inc.
Patel Jay K.
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