Frequency agile tuner and variable rate decimator for digital demodulator
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United States of America Patent
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Jan 30, 2007
Issued Date -
N/A
app pub date -
Jan 15, 2003
filing date -
Jan 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for demodulating a digital input signal having a pre-assigned symbol rate by using a single sample clock signal is disclosed. The pre-assigned symbol rate is selected from the group consisting of a plurality of symbol rates. The apparatus comprises: a Cascaded Integrated Comb (CIC) Decimator filter configured to perform a filtering-decimation operation to isolate the down converted digital signal having the pre-assigned symbol rate; a Shaper configured to restore an original spectrum of the I and Q components of the CIC output signal; and a CIC tuner loop filter configured to insert the estimated by the Coarse Frequency estimation block frequency offset into a carrier loop in order to complete a carrier recovery of the pre-assigned input digital signal.
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