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:
Nov. 12, 1996
Filed:
Apr. 29, 1994
Anand Narasimhan, New York, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present invention is a system and method for resolving closely spaced frequencies in frequency patterns used to tag objects. The system comprises a base station transceiver and one or more objects that send the base station a unique frequency pattern that identifies the respective object and/or provides information about the object. The base station performs a method by which an estimate of a received signal from an object is compared to one or more known frequency patterns in a frequency pattern set stored at the base station. One test frequency pattern at a time is selected and a distance is determined between the estimated received frequency pattern and the selected test frequency pattern. Iterative modifications are done to the test frequency pattern to minimize the distance. If the distance can be reduced to within a selected threshold, a known frequency pattern stored in the frequency pattern set at the base station and closest to the modified test frequency pattern is chosen as the frequency pattern transmitted by the object. The invention includes a method for determining and removing indeterministic noise.