Resources Contact Us Home
Modes of operations in QAM modems using hysteresis sub-states

Image Number 8 for United States Patent #7970080.

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.

  Recently Added Patents
Peptides useful in the treatment and/or care of skin, mucous membranes, scalp and/or hair and their use in cosmetic or pharmaceutical compositions
Health monitoring of applications in a guest partition
Pose-variant face recognition using multiscale local descriptors
Method and system for cooling of integrated circuits
Base station apparatus and method for use in mobile communication system
Delay lines, amplifier systems, transconductance compensating systems and methods of compensating
Method of manufacturing pipe with branch
  Randomly Featured Patents
Article prepared by depositing an alloying element on powder particles, and making the article from the particles
Electrically actuated servocontrol system for a static pressure operated load
Ambulatory assistance device such as a grab bar or the like
Hot start method for a combustion engine
Cam cleat construction
Chopper jar
Semiconductor package and a method for producing the same
Transportation container for fluid/gas samples
Reduced puffing needle coke from coal tar distillate
Nitrite-based corrosion inhibitors with improved anodic and cathodic inhibiting performance