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

Image Number 4 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
Reception system including a mechanism countering pulsed interference
Vending machine
Fuser member
Eye therapy system
Automatic adjustment of devices in a home entertainment system
All-in-one information handling system
Device and method for quantizing and inverse quantizing LPC filters in a super-frame
  Randomly Featured Patents
Sliding transfer device
Display system with image conversion mechanism and method of operation thereof
Apparatus for discharging exhaust gas at high velocity
Composite membrane for the separation of water and method for manufacturing same
Programmable logic unit and method for translating and processing instructions using interpretation registers
Systems and methods for remote work sessions
Stain resistant polyurethane coatings
Honeycomb extrusion die apparatus
Thin film magnetic head
Foldable chair frame