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:
Dec. 03, 2013
Filed:
Jun. 09, 2011
Stefan Langenbach, Nuremberg, DE;
Nebojsa Stojanovic, Nuremberg, DE;
Stefan Langenbach, Nuremberg, DE;
Nebojsa Stojanovic, Nuremberg, DE;
Cisco Technology, Inc., San Jose, CA (US);
Abstract
This invention relates to a method and a circuit for estimating the bit error rate in a data transmission system. Symbols are detected (u) by a maximum likelihood detector (), which provides path metrics of the decoded path and the best competitor at predetermined symbol positions. Absolute path metric differences () are calculated between the decoded path and the best competitor at said predetermined symbol positions. Events () are counted when an absolute path metric difference () is equal to one of a set of difference values. The bit error rate is estimated based on the number of counted () events (). The invention further comprises a method and a circuit in which a function is applied onto said absolute path metric difference. The function maps quantized logarithms of probabilities to probabilities.