Frequency agile tuner and variable rate decimator for...

Details Frequency agile tuner and variable rate decimator for... Frequency agile tuner and variable rate decimator for...

2007-01-30

2007-01-30

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S350000, C455S192200

Reexamination Certificate

active

10345863

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.

REFERENCES:
patent: 5375146 (1994-12-01), Chalmers
patent: 5425057 (1995-06-01), Paff
patent: 5487186 (1996-01-01), Scarpa
patent: 5495203 (1996-02-01), Harp et al.
patent: 5612975 (1997-03-01), Becker et al.
patent: 6141387 (2000-10-01), Zhang
patent: 6282248 (2001-08-01), Farrow et al.
patent: 2002/0122511 (2002-09-01), Kwentus et al.
patent: 2002/0156820 (2002-10-01), Kishi

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