Apparatus for deriving in-phase and quadrature-phase baseband signals from a communication signal
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United States of America Patent
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Jul 28, 1998
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N/A
app pub date -
May 6, 1996
filing date -
May 6, 1996
priority date (Note) -
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Abstract
In-phase (I) and quadrature-phase (Q) baseband signals (312, 314) are derived from a digitized signal (318) having a sampling rate. The digitized signal is band pass filtered (604) to produce a band passed signal (320), and the band passed signal is delayed (606) to produce a delayed band passed signal (322). The band passed signal and the delayed band passed signal are decimated (608) by a predetermined amount to produce, respectively, a decimated signal (328) and a decimated delayed signal (330). The decimated signal and the decimated delayed signal are low pass filtered (610) to produce, respectively, the I and Q baseband signals.
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