Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Semiconductor device and method of forming interconnect structure with conductive pads having expanded interconnect surface area for enhanced interconnection properties
Evolutionary clustering algorithm
Method for measuring and improving organization effectiveness
Method and system for scaling usage of a social based application on an online social network
Toilet bowl
System or method to assist and automate an information security classification and marking process for government and non-government organizations for information of an electronic document
Gestures for presentation of different views of a system diagram
  Randomly Featured Patents
Expression monitoring by hybridization to high density oligonucleotide arrays
Connected cards
Bifurcated stent and method of making same
Ceramic metal halide lamp with length to diameter ratio
Recombinant agents affecting thrombosis
Apparatus and method for percutaneously placing gastrostomy tubes
Pepper grinder
Apparatus for forming and packaging flexible ducting
Liquid atomization procedure
Electric machine with end ring and supporting tab