Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Viterbi decoder with l=2 best decoding paths










Image Number 4 for United States Patent #5784392.

This invention teaches a method, and circuits that operate in accordance with the method, for decoding data received from a communications channel. The method includes the steps of: (a) receiving a modulated communications signal that conveys block encoded data having at least a data field and a syndrome data field; and (b) determining transition metrics and path metrics for the block encoded data. The step of determining path metrics includes a step of retaining path metrics only for a Maximum-Likelihood (ML) path and for a second best ML path. The method further includes a step of: (c) decoding the block encoded data by performing either a full or a partial traceback operation for both the ML path metrics and also for the second best ML path metrics. In a full traceback there is obtained from the ML path a first plurality of detected bits representing the data field, a second plurality of detected bits from the ML path representing the syndrome data field, a third plurality of detected bits from the second best ML path representing the data field, and a fourth plurality of detected bits from the second best ML path representing the syndrome data field. A next step (d) determines a syndrome from the first plurality of detected bits, and then compares the determined syndrome to the second plurality of detected bits. Upon a match a next step (e) outputs the first plurality of detected bits as a received frame of data. If the step of comparing the determined syndrome to the second plurality of detected bits does not indicate a match, the method instead: (f) determines a syndrome from the third plurality of detected bits; (g) compares the determined syndrome to the fourth plurality of detected bits and, upon a match, (h) outputs the third plurality of detected bits as a received frame of data.








 
 
  Recently Added Patents
N-way routing packets across an intermediate network
Low temperature encapsulate welding
Adding calcium and bicarbonate to human blood
Sealing glass for semiconductor device, sealing material, sealing material paste, and semiconductor device and its production process
Imaging apparatus, character information association method and character information association program
Vehicle front fascia
One-transistor cell semiconductor on insulator random access memory
  Randomly Featured Patents
Investigation of destroyed assemblies and identification of components thereof
Magnetic drive device
Remote setting of recording timers
Method of manufacturing nanowires parallel to the supporting substrate
Organic photoelectric semiconductor device and method for fabricating the same
Preparation of composition for converting hydrocarbons and fats into biodegradable aqueous emulsions
Image control device and method, and image display device
Process for preparing a treated paper coating pigment
Continuous drier for bulk material
Optimization of decisions regarding multiple assets in the presence of various underlying uncertainties