Method and circuit for acquisition

Details Method and circuit for acquisition Method and circuit for acquisition

2006-07-18

2006-07-18

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Receivers

Angle modulation

C375S368000, C370S509000

Reexamination Certificate

active

07079597

ABSTRACT:
Frame synchronization is quickly established to acquire an RF channel in a short time. Numerically controlled oscillators1-1to1-3, complex calculation circuits2-1to2-3, band limit filters3-1to3-3, a selector7, a phase error detection circuit9, a loop filter10, and an AFC circuit11compose a carrier regeneration loop for removing the frequency error of the carrier included in an in-phase component I and a quadrant component Q of the baseband signal input to the complex calculation circuits2-1to2-3. A timing generator6detects which of frame synchronization pattern detection circuits5-1to5-3has detected a frame synchronization pattern, provides the selector7with a selection signal corresponding to the decision result, and sends a switch signal to the AFC circuit11. Thereafter, the carrier for removing the frequency error included in the baseband signal is regenerated to acquire an RF channel in a short time.

REFERENCES:
patent: 5251210 (1993-10-01), Mann et al.
patent: 5953649 (1999-09-01), Junell
patent: 06-46094 (1994-02-01), None
patent: 07-65513 (1995-03-01), None
patent: 10-4439 (1998-01-01), None

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