Fast digital carrier frequency error estimation algorithm using synchronization sequence
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United States of America Patent
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Dec 8, 2009
Grant Date -
Feb 1, 2007
app pub date -
Dec 21, 2005
filing date -
Jul 28, 2005
priority date (Note) -
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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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