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
Information terminal, setting information distribution server, right information distribution server, network connection setting program and method
Delay interferometer using magneto-optic effect of a variable faraday rotator
Image processing apparatus, image processing method, and program to create a composite image from color image data and monochrome image data
Cross-linkable compositions
Magnifying glass
System for encrypting and decrypting a plaintext message with authentication
Apparatus and method for phase synchronization in radio frequency transmitters
  Randomly Featured Patents
Arrangement for securing long slide rail device to vehicle
Dry blend fracturing fluid additives
System, kit, and method for measuring membrane diffusion
Agent for detecting malondialdehyde, method of making the same, and test kit for use thereof
Method for determining a property of a hydrocarbon-bearing formation
Data clustering method for bayesian data reduction
Portable radio frequency modem adapter
Ultra-hard constructions with enhanced second phase
Data loss prevention during a fall of a storage device
Illuminated magnetic module for toy construction kit