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. 17, 2006
Filed:
Sep. 23, 2002
Lisa Fredrickson, Long Beach, CA (US);
Lisa Fredrickson, Long Beach, CA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A simplified Viterbi detector for maximum likelihood detection of nine-bit QPSK symbols, employing a difference metric and two comparators, instead of using two state metrics and four comparators. The detector is used to process the outputs of synchronously sampled matched filters. A multiplexer is employed to select the difference metric from amongst the input sample, the fed back value of the difference metric itself, or the inverses of either, depending on decision signals output from the comparators, which in turn compare the difference metric with the input sample and it's inverse. The even path history then represents the most likely value of the detected symbol.