System and method for determining a modulation angle of an information bit in a complex modulated signal
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United States of America Patent
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Issued Date -
Oct 27, 2005
app pub date -
Mar 24, 2005
filing date -
Apr 21, 2004
priority date (Note) -
Abandoned
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Abstract
A system and method for determining a modulation angle of an information bit in a modulated complex signal comprise, in a first stage, determining the inphase component I and the quadrature component Q of the information bit in the modulated complex signal. A division stage determines an absolute ratio of the quadrature component Q to the inphase component I and a second stage determines from the polarity of the inphase and quadrature components the quadrant in which the modulation angle lies. A third stage determines the arctangent of the absolute ratio x of the quadrature component Q to the inphase component I of the transmitted information bit in the modulated signal. A fourth stage determines the modulation angle from the polarity of the inphase and quadrature components and the arctangent of the absolute ratio of the quadrature component Q to the inphase component I of the transmitted information bit in the modulated signal.
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