Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-12-21
2009-12-08
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S145000
Reexamination Certificate
active
07630428
ABSTRACT:
Methods and apparatus for determining carrier frequency error of a serial offset quadrature pulse shaped signal, such as a minimum shift keyed (MSK) signal, are disclosed. Carrier frequency error is determined by receiving a quadrature pulse shaped signal having a synchronization sequence, detecting synchronization of the quadrature pulse shaped signal, and storing a baseband inphase (I) signal and a baseband quadrature (Q) signal of the synchronization sequence while detecting synchronization. After detecting synchronization, segments of the stored baseband I and Q signals are read and correlated with a spreading sequence. Carrier frequency error is then estimated based on phase differences between each of the correlated segments.
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Barnett Gregory Thomas
Rasmussen Donald John
Corrielus Jean B
ITT Manufacturing Enterprises Inc.
RatnerPrestia
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