Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2005-05-10
2005-05-10
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Automatic frequency control
C375S262000, C375S326000, C375S343000, C375S327000, C375S329000
Reexamination Certificate
active
06891907
ABSTRACT:
A frequency offset correction system includes a phase shift estimation unit and correction unit. The phase shift estimation unit estimates a pilot phase shift from pilot signal data for a plurality of bits, and estimates a data phase shift of data from the pilot phase shift for each bit when the frequency offset of a received signal having data of an in-phase component whose bit rate is variable, and pilot signal data of a quadrature component is small. The correction unit sequentially adds data phase shifts and pilot phase shifts estimated by the phase shift estimation unit, and performs frequency offset correction of the received signal using a phase shift obtained by selectively inserting the estimated pilot phase shifts in the added estimated data phase shifts. A frequency offset correction method is also disclosed.
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Chin Stephen
Dickstein Shapiro Morin & Oshinsky LLP.
Pathak Sudhanshu C.
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