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
Touchscreen with extended conductive pattern
Anomalous data detection method
Electronic component, a semiconductor wafer and a method for producing an electronic component
Bamboo scrimber and manufacturing method thereof
Techniques for determining optimized local repair paths
Method and system for tracking mobile electronic devices while conserving cellular network resources
Transferring storage devices within storage device testing systems
  Randomly Featured Patents
Filter apparatus
Variable optical fiber Bragg filter arrangement
Preparing monoalkenyl aromatic monomer-maleic half ester copolymer
Diamond setting
Apparatus for cultivating soil
Sulphated polysaccharides having anti-metastatic and/or anti-inflammatory activity
Bearing mounting with self-compensation for thermal expansion
Method and device for inspection active matrix substrate
Poly (arylene ether sulfone) having sulfoalkoxy group, process of producing the same, and polymer electrolyte membrane comprising the same
Apparatus for stick-spearing stalk-cut tobacco stalks