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:
Jun. 04, 1985
Filed:
Jul. 08, 1983
Peter M Dollard, Highlands, NJ (US);
William Turin, Morganville, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
The present invention relates to a quasi-soft decision decoder for convolutional self-orthogonal codes which includes a multistage syndrome register, a bit detection means, parity check means and threshold logic gates. The bit detection means is augmented to render a 'quality' bit in conjunction with each detected data bit which indicates the quality of the received signal level for that bit when compared with a predetermined threshold signal level. Memory storage is provided for storing the quality bits in parallel with memory storage for the data bits. Each of the threshold logic gates includes a separate group of active inputs from the syndrome register plus an associated one of the quality bits, each gate being arranged to generate an information correction bit which is dependent on a predetermined threshold level of corresponding input signals. The quality bit, therefore, provides an additional vote in the decision of whether a suspect data bit is erroneous or not.