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
Compounds and their salts specific to the PPAR receptors and the EGF receptors and their use in the medical field
Process for recovering and recycling an acid catalyst
Communication network management system, method and program, and management computer
Remote controller
Method of manufacturing toner
Automated synchronization of design features in disparate code components using type differencing
System and method for parallel video processing in multicore devices
  Randomly Featured Patents
Providing redundancy in a storage system
Light source device for frequency division multiplexed optical communications
Pressure switch valve, for hydraulic vehicle brake systems with traction control (ASR)
Multilayer ceramic substrate and method for manufacturing the same
Radiant heater
Benzofuran-2-one
Method for producing a compact catalytic reactor
PLL with swappable tuning loops
Power amplifier system and mobile phone terminal using same
Recording and/or reproducing apparatus in which a reference signal is used in a recording and/or reproducing part as well as in another part