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US Patent 7801250 Low latency analog QAM coherent demodulation algorithm

Patent 7801250 was granted and assigned to General Dynamics Advanced Information Systems on September, 2010 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
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General Dynamics Advanced Information Systems
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
78012501
Patent Inventor Names
Michael G. Binkley1
Date of Patent
September 21, 2010
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Patent Application Number
114393101
Date Filed
May 24, 2006
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Patent Primary Examiner
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Tesfaldet Bocure
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Patent abstract

A digital demodulation method for a quadrature amplitude modulated signal uses a phase locked loop to generate a local carrier signal. The phase locked loop uses a feedback signal derived from one or more demodulated signals of interest. The loop has a filter characteristic with a stop band within the information bandwidth(s) of the information signal(s). The preferred method generates an error signal from DC components of in-phase and quadrature-phase baseband signals. DC components are preferably isolated using a low-latency, AC rejection filter.

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