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
Estimating optical characteristics of a camera component using sharpness sweep data
Engineered enzymes with methionine-gamma-lyase enzymes and pharmacological preparations thereof
Method of forming wafer level mold using glass fiber and wafer structure formed by the same
Soybean cultivar CL1013663
Method and computed tomography device and data storage medium for performing a dynamic CT examination on a patient
Method for computer-based determination of a position in a map, navigation device and mobile radio telephone
Memory elements with increased write margin and soft error upset immunity
  Randomly Featured Patents
Reptile cage
Method and communication system for identifying calling/called party
Forwarding load data to younger instructions in annex
Optical processing using a multilayer heterostructure
Hinged endotracheal tube holder having both a safety clamp and a securing clamp
Method for on-chip signal integrity and noise verification using frequency dependent RLC extraction and modeling techniques
Application instantiation based upon attributes and values stored in a meta data repository, including tiering of application layers objects and components
Optical fiber microscopy launch system and method
Self contained fuel system for solid oxide fuel cell
Lead having composite tubing