Interrogators communication systems communication methods and methods of processing a communication signal
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United States of America Patent
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Nov 27, 2001
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N/A
app pub date -
Apr 24, 1998
filing date -
Apr 24, 1998
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Abstract
The present invention includes interrogators, communication systems, communication methods, and methods of processing a communication signal. One aspect of the present invention provides a backscatter system interrogator including a downconverter configured to receive a backscatter communication signal having a first frequency and convert the backscatter communication signal having the first frequency to a subcarrier signal having a second frequency less than the first frequency; a filter coupled with the downconverter and configured to filter direct path energy from the subcarrier signal; and a gain control coupled with the filter and configured to adjust the gain of the filtered subcarrier signal.
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