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. 13, 2004
Filed:
Jan. 11, 2000
Hamadi Jamali, Redwood City, CA (US);
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Communication channel characteristics are determined without the use of a training mode using a single-valued solution. A received signal x is sent to an equalizer ( ) which compensates for noise added to the received signal x during transmission. To accurately determine the weights of the equalizer ( ), the output of the equalizer ( ) is transmitted to an amplitude square extractor ( ) to generate a value representative of the amplitude of the received signal x . Then, a forward-mapping module ( ) maps the amplitude value from the n-dimensional space of the amplitude value to an augmented space having, in a preferred embodiment n dimensions. In the augmented space, an augmented space blind adaptation mechanism ( ) is applied to generate a single-valued channel characteristic value in terms of an augmented space variable. Then, a backward-mapping module ( ) is applied to generale the optimal weights for the equalizer ( ) allowing an accurate recovery of the original signal s . The principles of the present invention can be applied to generate all of the filters required in high-speed data communications, and can be used for any other system in which channel characteristics are desired.