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
Atomic oscillator and manufacturing method
Methods and compositions for wound healing
Leaky wave mode solar receiver
Feedback method and processing system for policy installation failures
Platform for generating electricity from flowing fluid using generally prolate turbine
Automated macular pathology diagnosis in three-dimensional (3D) spectral domain optical coherence tomography (SD-OCT) images
  Randomly Featured Patents
Connector and electronic apparatus including the same
Corrugated flow field plate assembly for a fuel cell
Imaging tomography apparatus with fluid-containing chambers forming out-of-balance compensating weights for a rotating part
System and method for managing network connectivity of a CPE using a CMTS
Polyester film coated with metal adhesion promoting coating and having superior winding performance
Bioluminescence methods for enzymatic determinations
Apparatus for stripping fibre material from textile fibre bales of spinning material, for example cotton, synthetic fibres and the like
Jack socket assembly
Force field halftoning
Optical module using a linear sensor for identifying images