Digital mobile passive leak detection for broadband communication system
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United States of America Patent
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Aug 18, 2015
Grant Date -
Dec 5, 2013
app pub date -
Mar 8, 2013
filing date -
Jun 1, 2012
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Abstract
Passive detection of a quadrature amplitude modulated (QAM) signal amid noise is achieved by detection of a spectral component of a detected signal that corresponds to a known QAM symbol rate in, for example, a QAM modulated broadband communication system (BCS). Improved authentication can be provided by simultaneously detecting symbol rate components in two or more QAM bands. No modification of a broadband communication system such as by including a marker signal is required and thus there is no requirement for dedication of a portion of the broadband communication system spectrum or problem of marker signal interference with BCS signals.
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