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
Collaborative data redundancy for configuration tracking systems
File management apparatus and file management apparatus controlling method
Fast carrier allocation in multi-carrier systems
Hydrating lounge chair
Detecting mirrors on the web
Computer network running a distributed application
Utility knife
  Randomly Featured Patents
Means for locking a displaceable or rotatable part
Roller skate
Lubricant base from palm oil and its by-products
Portable feet tanning device
Electric lamp/reflector unit
Methods for concentrating and detecting microorganisms using centrifuge tubes
Process for controlling compressors
Method to make a perpendicular magnetic recording head with a bottom side shield
DC to DC converter with high frequency zigzag transformer
Wireless communications device