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:
Jan. 02, 2007
Filed:
Nov. 07, 2003
Nicholas Whinnett, Barnfield, GB;
Steven Wood, Hotwells, GB;
Xiaoyong Yu, Grayslake, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
The invention relates to an error correcting decoder apparatus () and method. The decoder apparatus () comprises a likelihood estimator () which generates a sequence of bit value likelihood estimates, such as log likelihood ratios, for multi bit symbols of a data sequence. The decoder apparatus () further comprises a decoder element (), such as a Maximum A Priori (MAP) or appropriate Soft Output Viterbi decoder. The decoder element () generates a decoded data sequence in response to the bit value likelihood estimates. The decoder apparatus () also comprises a weighted processor () which generates a weighted compensation data sequence from the decoded data sequence. The weighted compensation data is used to modify the sequence of bit value likelihood estimates. The decoding is subsequently repeated using the improved bit value likelihood estimates whereby improved decoding performance is achieved. The invention may be applied to a two decoder element decoding apparatus () and may specifically be applied to turbo decoders.