System and method for recognizing zero-amplitude symbols in a QAM signal and digital receiver incorporating the same
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United States of America Patent
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Mar 25, 2008
Grant Date -
Jan 23, 2003
app pub date -
Jul 19, 2001
filing date -
Jul 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for, and method of, recognizing zero-amplitude symbols in a quadrature amplitude modulated (QAM) signal and a digital receiver incorporating the system or the method. In one embodiment, the system includes: (1) an amplitude detector that extracts a candidate symbol from the signal and locates the candidate symbol relative to a constellation of symbols and (2) a zero-amplitude symbol interpreter, associated with the amplitude detector, that recognizes the candidate symbol as being a zero-amplitude symbol when the candidate symbol is closer to an origin of the constellation than to symbols proximate thereto.
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