Resources Contact Us Home
Chase algorithm based differential decoder for soft decision Reed Solomon decoding in a QAM system

Image Number 5 for United States Patent #8149925.

A novel apparatus and method of differential decoding for use in a communication system such as a cable system. The differential decoding mechanism of the present invention enables the use of the Chase algorithm for Reed Solomon (RS) codes (i.e. non-binary codes). The mechanism is well suited for use in systems employing QAM data modulation/demodulation techniques and that also incorporate use of a differential encoder such as in DOCSIS capable cable modem systems. The differential decoding mechanism is operative to analyze the input to the differential decoder and adjust the decoding action accordingly. The mechanism generates the first and second candidate constellation points needed by the Chase algorithm. Considering the differential encoding, there are four possible constellation candidates. The differential decoder reduces these four possible options to two by eliminating from consideration two of them. Depending on the number of symbols to be improved by the Chase algorithm, this reduction can potentially reduce the number of options significantly.

  Recently Added Patents
XDSL system and signal transmission method, sending device, and receiving device of xDSL system
Image processing apparatus and method configured to calculate defocus amount of designated area
Method for producing a sulfonated polyarylether block copolymer
Combined imaging and radiation therapy
Sampling filter device
Vectorization of program code
Compositions and methods for concentrating and depleting microorganisms
  Randomly Featured Patents
Satellite radio receiver that displays information regarding one or more channels that are not currently being listened to
Process for the preparation of water-dilutable coating binders based on acrylate copolymers, and their use
Method for setting playback environment of an interactive disk
Backhoe-mounted shear
Aminobenzoquinazolinone M1 receptor positive allosteric modulators
Method of forming a microelectromechanical (MEMS) device
Water-soluble nanoparticles with controlled aggregate sizes
Frame for supporting and displaying food trays
Emulating circuit-switched communications in a packet-switched environment
Dedicated interface architecture for a hybrid integrated circuit