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. 21, 2004
Filed:
Jun. 20, 2001
Michio Shimada, Kanagawa, JP;
Hisashi Suzuki, Tokyo, JP;
Machine Learning Laboratory, Inc., Kanagawa, JP;
Abstract
In order to rapidly determine a most likely code word at a decoder provided in a digital data transmission system using block codes or convolutional codes for the purposes of combating a noisy channel environment, an adaptively controllable threshold is introduced so as to discriminate a largest metric with a small amount of computations. The metric is the measure of closeness of a signal transmitted to the decoder to one of plural code words previously stored in the decoder. A counter counts the number of metrics each exceeding the threshold, and informs a controller of the count result, if the count result is more than one, the controller raises the threshold, on the contrary, if the count result is zero then the controller lowers the threshold, both are performed in an effort to narrow down one metric in excess of the threshold. The threshold thus adaptively controlled is compared with each of plural metrics. If the count result becomes one, it implies that the largest metric has been determined. Subsequently, a code word corresponding to the largest metric is regarded as the most likely code word.