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
Portion of a display panel with an ambiguous facial expression icon
Geo-coding images
Controlling transmission resources in mobile radio systems with dualtransfer mode
Laser processing a multi-device panel
Method of applying a spherical correction to map data for rendering direction-of-travel paths on a wireless communications device
Method and system for establishing security connection between switch equipments
Medical imaging probe with rotary encoder
  Randomly Featured Patents
Elementary function arithmetic unit
Apparatus and method for cooling power transformers
Spool assembly for pintle
Solar-powered outdoor light
Drilling assemblies and methods of drilling
Electric guitar having an electronic vibrato apparatus
Chemical analysis element cartridge
Prosthetic knee tibial component with axially ribbed keel and apparatus for effecting implant
School supply station
Container for storing multiple saw blades