Modes of operations in QAM modems using hysteresis sub-states

Details Modes of operations in QAM modems using hysteresis sub-states Modes of operations in QAM modems using hysteresis sub-states

2011-06-28

2011-06-28

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S229000, C375S232000, C375S233000, C375S261000

Reexamination Certificate

active

07970080

ABSTRACT:
A method of automated acquisition of a QAM signal is provided. The method employs a State machine progressing from an initial State to a final State. The State machine comprises: a symbol timing recovery loop; a carrier loop; a coarse frequency loop; and an equalizer. The method comprises: (A) Performing an automatic gain control (AGC) operation on an incoming QAM signal; (B) Performing a symbol timing recovery of an input QAM signal by adjusting a sampling clock of the symbol timing recovery loop; (C) Performing a Blind Equalization of the QAM signal without carrier lock; (D) Performing a carrier recovery of the QAM signal; and (E) Performing a decision directed equalization (DDE) of the QAM signal by updating a set of coefficients of the equalizer by using a decision based algorithm.

REFERENCES:
patent: 6115433 (2000-09-01), de Lantremange
patent: 6150978 (2000-11-01), McBurney
patent: 6278741 (2001-08-01), Danzer et al.
patent: 6510188 (2003-01-01), Isaksen et al.
patent: 6904098 (2005-06-01), Isaksen et al.
patent: 7079605 (2006-07-01), Isaksen et al.
patent: 2002/0067764 (2002-06-01), Kindler et al.
patent: 2004/0005022 (2004-01-01), Zhu et al.

Affiliated with

Also associated with

Rating

Modes of operations in QAM modems using hysteresis sub-states does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Modes of operations in QAM modems using hysteresis sub-states, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modes of operations in QAM modems using hysteresis sub-states will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2743287