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System and method for recognizing zero-amplitude symbols in a QAM signal and digital receiver incorporating the same

  • US 7,349,486 B2
  • Filed: 07/19/2001
  • Issued: 03/25/2008
  • Est. Priority Date: 07/19/2001
  • Status: Expired due to Fees
First Claim
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1. A system for recognizing zero-amplitude symbols in a quadrature amplitude modulated (QAM) signal, comprising:

  • a zero-amplitude symbol interpreter that recognizes a candidate symbol extracted from said signal as being a zero-amplitude symbol based on when said candidate symbol is within a zone having a boundary formed by a set of points that are equidistant between an origin of a constellation of symbols and a nearest one of four proximate symbols, said zero-amplitude symbol interrupting a regular rectangular array of said constellation of symbols, wherein ideal symbols of said regular rectangular array are substantially equidistant to each other.

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