Demodulator for a radio receiver and method of operation
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United States of America Patent
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Mar 15, 2005
Grant Date -
Sep 12, 2002
app pub date -
Mar 12, 2001
filing date -
Mar 12, 2001
priority date (Note) -
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Abstract
A demodulator (20) extracts a digital sub-carrier signal from a modulated signal and provides the sub-carrier signal in clock and data format. Demodulation occurs with two mixing stages (32, 40, 42) and at sampling frequencies that are independent from the frequency of transmission of the modulated signal. Matched filters (44, 46) try to match the received sub-carrier signal with a predefined bi-phase pulse shape. Phase correction is applied at a low sampling frequency. After phase correction, digital interpolation is used to re-sample the sub-carrier signal.
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