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
Churn prediction and management system
Modified continuous phase modulation communications system and related methods
Semiconductor device and method of manufacturing the same
Gathering user feedback in web applications
PLL circuit
Method for producing SOI substrate and SOI substrate
Method of providing user-tailored entertainment experience at hospitality location and hospitality media system thereof
  Randomly Featured Patents
Microencapsulated composition containing solvent including triisopropyylbiphenyl
Room temperature curing polyorganosiloxane compositions
Process for controlling grapevine ripening and relative piece of equipment
Airflow deflector assembly
Method and apparatus for preventing unauthorized access to peripheral devices
Thermosetting binders for cathodic deposition in electrodeposition paints
Ultrasonic joint inspection device and method
Lift system intended for free-falling persons
Method of burning lump-sized combustible material, and an annular shaft kiln for carrying out this method
Methods of in vivo gene delivery