The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 2006
Filed:
Jun. 21, 2002
Alexander Worm, Brussels, BE;
Heiko Michel, Kaiserslautern, DE;
Norbert Wehn, Queidersbach, DE;
Alcatel, Paris, FR;
Abstract
A method and apparatus are disclosed for decoding according to a Log-MAP algorithm, a bit sequence encoded by a convolutional encoder and received through a noisy channel. A digital signal processor (DSP) for performing the decoding is provided with an extended core possessing a transition metric calculation unit () for calculating transition metric values of the encoder trellis for output to a memory store () of the DSP, and for output to a unit () for performing a Log-MAP add-compare-select operation. The Log-MAP add-compare-select unit () calculates updated path metric values of the encoder trellis for storage in a memory store () of the DSP, and for input to a Log-Likelihood Ratio calculating unit (). The Log-Likelihood Ratio calculating unit () are each controlled by the program control unit () of the DSP, and communicate with the data memories () of the DSP, via data lines ().