US Patent 7787568 High bit rate RFID system

Patent 7787568 was granted and assigned to Symbol Technologies on August, 2010 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Symbol Technologies

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

77875680

Patent Inventor Names

Yuri Okunev0

Date of Patent

August 31, 2010

Patent Application Number

114724530

Date Filed

June 22, 2006

Patent Primary Examiner

‌

Eva Y Puente

Patent abstract

Methods, systems, and apparatuses for quadrature amplitude modulation (QAM) based radio frequency identification (RFID) systems are described. In an aspect, a tag transmitter performs QAM signal mapping and quadrature modulation of a carrier wave (CW), to transmit a QAM response signal. In another aspect, a QAM-enabled reader receiver receives the QAM tag response signal, and performs quasi-coherent signal processing, based on tracking of QAM signal parameters in a decision feedback loop.