Carrier frequency recovery apparatus capable of simultaneously reducing frequency offset and phase error and method of the same
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United States of America Patent
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Jun 15, 2004
Grant Date -
N/A
app pub date -
Jun 26, 2000
filing date -
Jun 24, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A carrier frequency recovery apparatus for simultaneously reducing a frequency offset and a phase error includes: a phase detector for estimating phase error of an I-channel and Q-channel signals having a frequency offset; a select signal generator for receiving the phase error and generating a select signal; a first loop filter for attenuating the phase error by a predetermined range; a second loop filter for attenuating the phase error in a range narrower than the first loop filter; an addition unit for adding the output value of the first loop filter to an output value of the second loop filter; a multiplexer for selectively outputting an output value of the first loop filter or an output value of the addition unit in response to the select signal; and a voltage-controlled oscillator block for storing and outputting cosine and sine signals corresponding to an output value of the multiplexer.
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